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This program is an extension of recipe 577567 in that it not only allows one to find a directory's size but also remove files based on a context menu. The directory pruner has been used by my roommate to free up room on his hard drive and also by several friends that wished to remove games and other unnecessary program that were taking up their space. Right-click on found directories to review your options.

If you wish to vote this recipe down, please post a comment at the bottom telling me how you would improve the utility.

Python, 993 lines
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#! /usr/bin/env python

"""Module providing GUI capability to prune any directory.

The code presented in this module is for the purposes of: (1) ascertaining
the space taken up by a directory, its files, its sub-directories, and its
sub-files; (2) allowing for the removal of the sub-files, sub-directories,
files, and directory found in the first purpose; (3) giving the user a GUI
to accomplish said purposes in a convenient way that is easily accessible."""

################################################################################

__author__ = 'Stephen "Zero" Chappell <Noctis.Skytower@gmail.com>'
__date__ = '15 February 2011'
__version__ = '$Revision: 298 $'

################################################################################

# Import several GUI libraries.
import tkinter
import tkinter.ttk
import tkinter.filedialog
import tkinter.messagebox

# Import other needed modules.
import zlib
import base64
import os
import math

################################################################################

ICON = b'eJxjYGAEQgEBBiApwZDBzMAgxsDAoAHEQCEGBQaIOAwkQDE2UOSkiUM\
Gp/rlyd740Ugzf8/uXROxAaA4VvVAqcfYAFCcoHqge4hR/+btWwgCqoez8aj//fs\
XWiAARfCrhyCg+XA2HvV/YACoHs4mRj0ywKWe1PD//p+B4QMOmqGeMAYAAY/2nw=='

################################################################################

class GUISizeTree(tkinter.ttk.Frame):

    "Widget for examining size of directory with optional deletion."

    WARN = True # Should warnings be made for permanent operations?
    MENU = True # Should the (destructive) context menu be enabled?

    # Give names to columns.
    CLMS = 'total_size', 'file_size', 'path'
    TREE = '#0'

    ########################################################################

    # Allow direct execution of GUISizeTree widget.

    @classmethod
    def main(cls):
        "Create an application containing a single GUISizeTree widget."
        tkinter.NoDefaultRoot()
        root = cls.create_application_root()
        cls.attach_window_icon(root, ICON)
        view = cls.setup_class_instance(root)
        root.mainloop()

    @staticmethod
    def create_application_root():
        "Create and configure the main application window."
        root = tkinter.Tk()
        root.minsize(430, 215)
        root.title('Directory Pruner')
        root.option_add('*tearOff', tkinter.FALSE)
        return root

    @staticmethod
    def attach_window_icon(root, icon):
        "Generate and use the icon in the window's corner."
        with open('tree.ico', 'wb') as file:
            file.write(zlib.decompress(base64.b64decode(ICON)))
        root.iconbitmap('tree.ico')
        os.remove('tree.ico')

    @classmethod
    def setup_class_instance(cls, root):
        "Build GUISizeTree instance that expects resizing."
        instance = cls(root)
        instance.grid(row=0, column=0, sticky=tkinter.NSEW)
        root.grid_rowconfigure(0, weight=1)
        root.grid_columnconfigure(0, weight=1)
        return instance

    ########################################################################

    # Initialize the GUISizeTree object.

    def __init__(self, master=None, **kw):
        "Initialize the GUISizeTree instance and configure for operation."
        super().__init__(master, **kw)
        # Initialize and configure this frame widget.
        self.capture_root()
        self.create_widgets()
        self.create_supports()
        self.create_bindings()
        self.configure_grid()
        self.configure_tree()
        self.configure_menu()
        # Set focus to path entry.
        self.__path.focus_set()

    def capture_root(self):
        "Capture the root (Tk instance) of this application."
        widget = self.master
        while not isinstance(widget, tkinter.Tk):
            widget = widget.master
        self.__tk = widget

    def create_widgets(self):
        "Create all the widgets that will be placed in this frame."
        self.__label = tkinter.ttk.Button(self, text='Path:',
                                          command=self.choose)
        self.__path = tkinter.ttk.Entry(self, cursor='xterm')
        self.__run = tkinter.ttk.Button(self, text='Search',
                                        command=self.search)
        self.__cancel = tkinter.ttk.Button(self, text='Cancel',
                                           command=self.stop_search)
        self.__progress = tkinter.ttk.Progressbar(self,
                                                  orient=tkinter.HORIZONTAL)
        self.__tree = tkinter.ttk.Treeview(self, columns=self.CLMS,
                                           selectmode=tkinter.BROWSE)
        self.__scroll_1 = tkinter.ttk.Scrollbar(self, orient=tkinter.VERTICAL,
                                                command=self.__tree.yview)
        self.__scroll_2 = tkinter.ttk.Scrollbar(self, orient=tkinter.HORIZONTAL,
                                                command=self.__tree.xview)
        self.__grip = tkinter.ttk.Sizegrip(self)

    def create_supports(self):
        "Create all GUI elements not placed directly in this frame."
        self.__menu = tkinter.Menu(self)
        self.create_directory_browser()
        self.create_error_message()
        self.create_warning_message()

    def create_directory_browser(self):
        "Find root of file system and create directory browser."
        head, tail = os.getcwd(), True
        while tail:
            head, tail = os.path.split(head)
        self.__dialog = tkinter.filedialog.Directory(self, initialdir=head)

    def create_error_message(self):
        "Create error message when trying to search bad path."
        options = {'title': 'Path Error',
                   'icon': tkinter.messagebox.ERROR,
                   'type': tkinter.messagebox.OK,
                   'message': 'Directory does not exist.'}
        self.__error = tkinter.messagebox.Message(self, **options)

    def create_warning_message(self):
        "Create warning message for permanent operations."
        options = {'title': 'Important Warning',
                   'icon': tkinter.messagebox.QUESTION,
                   'type': tkinter.messagebox.YESNO,
                   'message': '''\
You cannot undo these operations.
Are you sure you want to do this?'''}
        self.__warn = tkinter.messagebox.Message(self, **options)

    def create_bindings(self):
        "Bind the widgets to any events they will need to handle."
        self.__label.bind('<Return>', self.choose)
        self.__path.bind('<Control-Key-a>', self.select_all)
        self.__path.bind('<Control-Key-/>', lambda event: 'break')
        self.__path.bind('<Return>', self.search)
        self.__run.bind('<Return>', self.search)
        self.__cancel.bind('<Return>', self.stop_search)
        self.bind_right_click(self.__tree, self.open_menu)

    @staticmethod
    def select_all(event):
        "Select all of the contents in this Entry widget."
        event.widget.selection_range(0, tkinter.END)
        return 'break'

    def bind_right_click(self, widget, action):
        "Bind action to widget while considering Apple computers."
        if self.__tk.tk.call('tk', 'windowingsystem') == 'aqua':
            widget.bind('<2>', action)
            widget.bind('<Control-1>', action)
        else:
            widget.bind('<3>', action)

    def configure_grid(self):
        "Place all widgets on the grid in their respective locations."
        self.__label.grid(row=0, column=0)
        self.__path.grid(row=0, column=1, sticky=tkinter.EW)
        self.__run.grid(row=0, column=2, columnspan=2)
        self.__run.grid_remove()
        self.__cancel.grid(row=0, column=2, columnspan=2)
        self.__cancel.grid_remove()
        self.__run.grid()
        self.__progress.grid(row=1, column=0, columnspan=4, sticky=tkinter.EW)
        self.__tree.grid(row=2, column=0, columnspan=3, sticky=tkinter.NSEW)
        self.__scroll_1.grid(row=2, column=3, sticky=tkinter.NS)
        self.__scroll_2.grid(row=3, column=0, columnspan=3, sticky=tkinter.EW)
        self.__grip.grid(row=3, column=3, sticky=tkinter.SE)
        # Configure the grid to automatically resize internal widgets.
        self.grid_rowconfigure(2, weight=1)
        self.grid_columnconfigure(1, weight=1)

    def configure_tree(self):
        "Configure the Treeview widget."
        # Setup the headings.
        self.__tree.heading(self.TREE, text=' Name', anchor=tkinter.W,
                            command=self.sort_name)
        self.__tree.heading(self.CLMS[0], text=' Total Size', anchor=tkinter.W,
                            command=self.sort_total_size)
        self.__tree.heading(self.CLMS[1], text=' File Size', anchor=tkinter.W,
                            command=self.sort_file_size)
        self.__tree.heading(self.CLMS[2], text=' Path', anchor=tkinter.W,
                            command=self.sort_path)
        # Setup the columns.
        self.__tree.column(self.TREE, minwidth=100, width=200)
        self.__tree.column(self.CLMS[0], minwidth=100, width=200)
        self.__tree.column(self.CLMS[1], minwidth=100, width=200)
        self.__tree.column(self.CLMS[2], minwidth=100, width=200)
        # Connect the Scrollbars.
        self.__tree.configure(yscrollcommand=self.__scroll_1.set)
        self.__tree.configure(xscrollcommand=self.__scroll_2.set)

    def configure_menu(self):
        "Configure the (context) Menu widget."
        # Shortcut for narrowing the search.
        self.__menu.add_command(label='Search Directory',
                                command=self.search_dir)
        self.__menu.add_separator()
        # Operations committed on directory.
        self.__menu.add_command(label='Remove Directory', command=self.rm_dir)
        self.__menu.add_command(label='Remove Files', command=self.rm_files)
        self.__menu.add_separator()
        # Operations that recurse on sub-directories.
        self.__menu.add_command(label='Remove Sub-directories',
                                command=self.rm_subdirs)
        self.__menu.add_command(label='Remove Sub-files',
                                command=self.rm_subfiles)
        # Only add "Open Directory" command on Windows.
        if hasattr(os, 'startfile'):
            self.__menu.add_separator()
            self.__menu.add_command(label='Open Directory',
                                    command=self.open_dir)

    ########################################################################

    # This property is used to control access to operations.

    def __get_operations_enabled(self):
        "Return if run button is in normal state."
        return self.__run['state'].string == tkinter.NORMAL

    def __set_operations_enabled(self, value):
        "Enable or disable run button's state according to value."
        self.__run['state'] = tkinter.NORMAL if value else tkinter.DISABLED

    operations_enabled = property(__get_operations_enabled,
                                  __set_operations_enabled,
                                  doc="Flag controlling certain operations")

    ########################################################################

    # Handle path browsing and searching actions.

    def choose(self, event=None):
        "Show directory browser and set path as needed."
        path = self.__dialog.show()
        if path:
            # Entry is cleared before absolute path is added.
            self.__path.delete(0, tkinter.END)
            self.__path.insert(0, os.path.abspath(path))

    def search(self, event=None):
        "Search the path and display the size of the directory."
        if self.operations_enabled:
            self.operations_enabled = False
            # Get absolute path and check existence.
            path = os.path.abspath(self.__path.get())
            if os.path.isdir(path):
                # Enable operations after finishing search.
                self.__search(path)
                self.operations_enabled = True
            else:
                self.shake()

    def __search(self, path):
        "Execute the search procedure and display in Treeview."
        self.__run.grid_remove()
        self.__cancel.grid()
        children = self.start_search()
        try:
            tree = SizeTree(self.update_search, path)
        except StopIteration:
            self.handle_stop_search(children)
        else:
            self.finish_search(children, tree)
        self.__cancel.grid_remove()
        self.__run.grid()

    ########################################################################

    # Execute various phases of a search.

    def start_search(self):
        "Edit the GUI in preparation for executing a search."
        self.__stop_search = False
        children = Apply(TreeviewNode(self.__tree).children)
        children.detach()
        self.__progress.configure(mode='indeterminate', maximum=100)
        self.__progress.start()
        return children

    def update_search(self):
        "Check if search has been stopped and update the GUI."
        self.validate_search()
        self.update()

    def validate_search(self):
        "Check that the current search action is valid."
        if self.__stop_search:
            self.__stop_search = False
            raise StopIteration('Search has been canceled!')

    def stop_search(self, event=None):
        "Cancel a search by setting its stop flag."
        self.__stop_search = True

    def handle_stop_search(self, children):
        "Reset the Treeview and Progressbar on premature termination."
        children.reattach()
        self.__progress.stop()
        self.__progress['mode'] = 'determinate'

    def finish_search(self, children, tree):
        "Delete old children, update Progressbar, and update Treeview."
        children.delete()
        self.__progress.stop()
        self.__progress.configure(mode='determinate',
                                  maximum=tree.total_nodes+1)
        node = TreeviewNode(self.__tree).append(tree.name)
        try:
            self.build_tree(node, tree)
        except StopIteration:
            pass

    ########################################################################

    # Handle Treeview column sorting events initiated by user.

    def sort_name(self):
        "Sort children of selected node by name."
        TreeviewNode.current(self.__tree).sort_name()

    def sort_total_size(self):
        "Sort children of selected node by total size."
        TreeviewNode.current(self.__tree).sort_total_size()

    def sort_file_size(self):
        "Sort children of selected node by file size."
        TreeviewNode.current(self.__tree).sort_file_size()

    def sort_path(self):
        "Sort children of selected node by path."
        TreeviewNode.current(self.__tree).sort_path()

    ########################################################################

    # Handle right-click events on the Treeview widget.

    def open_menu(self, event):
        "Select Treeview row and show context menu if allowed."
        item = event.widget.identify_row(event.y)
        if item:
            event.widget.selection_set(item)
            if self.menu_allowed:
                self.__menu.post(event.x_root, event.y_root)

    @property
    def menu_allowed(self):
        "Check if menu is enabled along with operations."
        return self.MENU and self.operations_enabled

    def search_dir(self):
        "Search the path of the currently selected row."
        path = TreeviewNode.current(self.__tree).path
        self.__path.delete(0, tkinter.END)
        self.__path.insert(0, path)
        self.search()

    def rm_dir(self):
        "Remove the currently selected directory."
        if self.commit_permanent_operation:
            self.do_remove_directory()

    def rm_files(self):
        "Remove the files in the currently selected directory."
        if self.commit_permanent_operation:
            self.do_remove_files()

    def rm_subdirs(self):
        "Remove the sub-directories of the currently selected directory."
        if self.commit_permanent_operation:
            self.do_remove_subdirectories()

    def rm_subfiles(self):
        "Remove the sub-files of the currently selected directory."
        if self.commit_permanent_operation:
            self.do_remove_subfiles()

    @property
    def commit_permanent_operation(self):
        "Check if warning should be issued before committing operation."
        return not self.WARN or self.__warn.show() == tkinter.messagebox.YES

    def open_dir(self):
        "Open up the current directory (only available on Windows)."
        os.startfile(TreeviewNode.current(self.__tree).path)

    ########################################################################

    # Execute actions requested by context menu.

    def do_remove_directory(self):
        "Remove a directory and all of its sub-directories."
        self.begin_rm()
        # Get the current Treeview node and delete it.
        node = TreeviewNode.current(self.__tree)
        directory_size, path = node.total_size, node.path
        position, parent = node.position, node.delete(True)
        # Delete the entire directory at path.
        self.__rm_dir(self.update, path, True, True)
        if os.path.isdir(path):
            # Add the directory back to the Treeview.
            tree = SizeTree(self.update, path)
            self.begin_rm_update(tree.total_nodes + 1)
            # Rebuild the Treeview under the parent.
            node = parent.insert(position, tree.name)
            self.build_tree(node, tree)
            # New directory size.
            total_size = tree.total_size
        else:
            self.begin_rm_update()
            # New directory size.
            total_size = 0
        # If the size has changed, update parent nodes.
        if directory_size != total_size:
            diff = total_size - directory_size
            self.update_parents(parent, diff)
        self.end_rm()

    def do_remove_files(self):
        "Remove all of the files in the selected directory."
        # Delete files in the directory and get its new size.
        node = TreeviewNode.current(self.__tree)
        total_size = self.__rm_files(node.path)
        # Update current and parent nodes if the size changed.
        if node.file_size != total_size:
            diff = total_size - node.file_size
            node.file_size = total_size
            node.total_size += diff
            self.update_parents(node.parent, diff)

    def do_remove_subdirectories(self):
        "Remove all subdirectories in the directory."
        self.begin_rm()
        # Remove all the children nodes in Viewtree.
        node = TreeviewNode.current(self.__tree)
        for child in node.children:
            child.delete()
        # Delete all of the subdirectories and their files.
        self.__rm_dir(self.update, node.path, True)
        # Find out what subdirectories could not be deteled.
        tree = SizeTree(self.update, node.path)
        self.begin_rm_update(tree.total_nodes)
        if tree.total_nodes:
            # Rebuild the Viewtree as needed.
            self.build_tree(node, tree, False)
            # Fix node and prepare to update parents.
            diff = node.total_size - tree.total_size
            node.total_size = tree.total_size
        else:
            # Fix node and prepare to update parents.
            diff = node.file_size - node.total_size
            node.total_size = node.file_size
        # Update parents with new size.
        self.update_parents(node.parent, diff)
        self.end_rm()

    def do_remove_subfiles(self):
        "Remove all subfiles while keeping subdirectories in place."
        self.begin_rm()
        # Delete all subfiles from current directory.
        node = TreeviewNode.current(self.__tree)
        self.__rm_dir(self.update, node.path)
        # Build a new SizeTree to find the result.
        tree = SizeTree(self.update, node.path)
        self.begin_rm_update(tree.total_nodes)
        # Record the difference and patch the Viewtree.
        diff = tree.total_size - node.total_size
        self.patch_tree(node, tree)
        # Fix all parent nodes with the correct size.
        self.update_parents(node.parent, diff)
        self.end_rm()

    ########################################################################

    # Help update Progressbar in removal process.

    def begin_rm(self):
        "Start a long-running removal operation."
        self.operations_enabled = False
        self.__progress.configure(mode='indeterminate', maximum=100)
        self.__progress.start()

    def begin_rm_update(self, nodes=0):
        "Move to determinate mode of updating the Viewtree."
        self.__progress.stop()
        self.__progress.configure(mode='determinate', maximum=nodes)

    def end_rm(self):
        "Finish removal process by enabling operations."
        self.operations_enabled = True

    ########################################################################

    # Help in removing directories and files.

    @staticmethod
    def __rm_dir(callback, path, rm_dir=False, rm_root=False):
        "Remove directory at path, respecting the flags."
        for root, dirs, files in os.walk(path, False):
            # Ignore path if rm_root is false.
            if rm_root or root != path:
                callback()
                for name in files:
                    file_name = os.path.join(root, name)
                    # Remove file while catching errors.
                    try:
                        os.remove(file_name)
                    except OSError:
                        pass
                # Ignore directory if rm_dir is false.
                if rm_dir:
                    try:
                        os.rmdir(root)
                    except OSError:
                        pass

    @staticmethod
    def __rm_files(path):
        "Remove files in path and get remaining space."
        total_size = 0
        # Find all files in directory of path.
        for name in os.listdir(path):
            path_name = os.path.join(path, name)
            if os.path.isfile(path_name):
                # Try to remove any file that may have been found.
                try:
                    os.remove(path_name)
                except OSError:
                    try:
                        # If there was an error, try to get the filesize.
                        total_size += os.path.getsize(path_name)
                    except OSError:
                        pass
        # Return best guess of space still occupied.
        return total_size

    ########################################################################

    # Update the Viewtree nodes after creating a SizeTree object.

    def build_tree(self, node, tree, update_node=True):
        "Build the Treeview while updating the Progressbar."
        self.validate_search()
        if update_node:
            self.sync_nodes(node, tree)
        self.add_children(node, tree)

    def sync_nodes(self, node, tree):
        "Update attributes on node and refresh GUI."
        # Copy the information on the node.
        node.total_size = tree.total_size
        node.file_size = tree.file_size
        node.path = tree.path
        # Update the Progressbar and GUI.
        self.__progress.step()
        self.update()

    def patch_tree(self, node, tree):
        "Patch differences between node and tree."
        node.total_size = tree.total_size
        node.file_size = tree.file_size
        self.patch_children(node, tree)
        self.add_children(node, tree)

    def add_children(self, node, tree):
        "Build and traverse all child nodes."
        for child in tree.children:
            subnode = node.append(child.name)
            self.build_tree(subnode, child)

    def patch_children(self, node, tree):
        "Patch Viewtree based on children of SizeTree."
        for subnode in node.children:
            child = tree.pop_child(subnode.name)
            if child is None:
                # Directory is gone.
                subnode.delete()
            else:
                # Dig down further in tree.
                self.__progress.step()
                self.update()
                self.patch_tree(subnode, child)

    @staticmethod
    def update_parents(node, diff):
        "Add in difference to node and parents."
        while not node.root:
            node.total_size += diff
            node = node.parent

    ########################################################################

    # Show an error when searching paths that do not exist.

    def shake(self, force=False):
        "Prepare to shake the application's root window."
        if force:
            tkinter._tkinter.setbusywaitinterval(20)
        elif tkinter._tkinter.getbusywaitinterval() != 20:
            # Show error message if not running at 50 FPS.
            self.__error.show()
            self.operations_enabled = True
            return
        # Shake window at 50 FPS.
        self.after_idle(self.__shake)

    def __shake(self, frame=0):
        "Animate each step of shaking the root window."
        frame += 1
        # Get the window's location and update the X position.
        x, y = map(int, self.__tk.geometry().split('+')[1:])
        x += round(math.sin(math.pi * frame / 2.5) * \
                   math.sin(math.pi * frame / 50) * 5)
        self.__tk.geometry('+{}+{}'.format(x, y))
        if frame < 50:
            # Schedule next step in the animation.
            self.after(20, self.__shake, frame)
        else:
            # Enable operations after one second.
            self.operations_enabled = True

################################################################################

class TreeviewNode:

    "Interface to allow easier interaction with Treeview instance."

    @classmethod
    def current(cls, tree):
        "Take a tree view and return its currently selected node."
        node = tree.selection()
        return cls(tree, node[0] if node else node)

    ########################################################################

    # Standard Treeview Operations

    __slots__ = '__tree', '__node'

    def __init__(self, tree, node=''):
        "Initialize the TreeviewNode object (root if node not given)."
        self.__tree = tree
        self.__node = node

    def __str__(self):
        "Return a string representation of this node."
        return '''\
NODE: {!r}
  Name: {}
  Total Size: {}
  File Size: {}
  Path {}\
'''.format(self.__node, self.name, self.total_size, self.file_size, self.path)

    def insert(self, position, text):
        "Insert a new node with text at position in current node."
        node = self.__tree.insert(self.__node, position, text=text)
        return TreeviewNode(self.__tree, node)

    def append(self, text):
        "Add a new node with text to the end of this node."
        return self.insert(tkinter.END, text)

    def move(self, parent, index):
        "Insert this node under parent at index."
        self.__tree.move(self.__node, parent, index)

    def reattach(self, parent='', index=tkinter.END):
        "Attach node to parent at index (defaults to end of root)."
        self.move(parent, index)

    def detach(self):
        "Unlink this node from its parent but do not delete."
        self.__tree.detach(self.__node)

    def delete(self, get_parent=False):
        "Delete this node (optionally, return parent)."
        if self.__tree.exists(self.__node):
            parent = self.parent if get_parent else None
            self.__tree.delete(self.__node)
            return parent
        assert not get_parent, 'Cannot return parent!'

    ########################################################################

    # Standard Treeview Properties

    @property
    def root(self):
        "Return if this is the root node."
        return self.__node == ''

    @property
    def parent(self):
        "Return the parent of this node."
        return TreeviewNode(self.__tree, self.__tree.parent(self.__node))

    @property
    def level(self):
        "Return number of levels this node is under root."
        count, node = 0, self
        while not node.root:
            node = node.parent
            count += 1
        return count

    @property
    def position(self):
        "Return the position of this node in its parent."
        return self.__tree.index(self.__node)

    @property
    def expanded(self):
        "Return whether or not the node is current open."
        value = self.__tree.item(self.__node, 'open')
        return bool(value) and value.string == 'true'

    @property
    def children(self):
        "Yield back each child of this node."
        for child in self.__tree.get_children(self.__node):
            yield TreeviewNode(self.__tree, child)

    ########################################################################

    # Custom Treeview Properties
    # (specific for application)

    @property
    def name(self):
        "Return the name of this node (tree column)."
        return self.__tree.item(self.__node, 'text')

    def __get_total_size(self):
        return parse(self.__tree.set(self.__node, GUISizeTree.CLMS[0]))

    def __set_total_size(self, value):
        self.__tree.set(self.__node, GUISizeTree.CLMS[0], convert(value))

    total_size = property(__get_total_size, __set_total_size,
                          doc="Total size of this node (first column)")

    def __get_file_size(self):
        return parse(self.__tree.set(self.__node, GUISizeTree.CLMS[1]))

    def __set_file_size(self, value):
        self.__tree.set(self.__node, GUISizeTree.CLMS[1], convert(value))

    file_size = property(__get_file_size, __set_file_size,
                         doc="File size of this node (second column)")

    def __get_path(self):
        return self.__tree.set(self.__node, GUISizeTree.CLMS[2])

    def __set_path(self, value):
        self.__tree.set(self.__node, GUISizeTree.CLMS[2], value)

    path = property(__get_path, __set_path,
                    doc="Path of this node (third column)")

    ########################################################################

    # Custom Treeview Sort Order
    # (specific for application)

    def sort_name(self):
        "If the node is open, sort its children by name."
        self.__sort(lambda child: child.name)

    def sort_total_size(self):
        "If the node is open, sort its children by total size."
        self.__sort(lambda child: child.total_size)

    def sort_file_size(self):
        "If the node is open, sort its children by file size."
        self.__sort(lambda child: child.file_size)

    def sort_path(self):
        "If the node is open, sort its children by path."
        self.__sort(lambda child: child.path)

    def __sort(self, key):
        "Sort an expanded node's children by the given key."
        if self.expanded:
            nodes = list(self.children)
            order = sorted(nodes, key=key)
            if order == nodes:
                order = reversed(order)
            for child in order:
                self.__tree.move(child.__node, self.__node, tkinter.END)

################################################################################

class SizeTree:

    "Create a tree structure outlining a directory's size."

    __slots__ = 'name path children file_size total_size total_nodes'.split()

    def __init__(self, callback, path):
        "Initialize the SizeTree object and search the path while updating."
        callback()  # Allow the GUI to be updated.
        head, tail = os.path.split(path)
        # Create attributes for this instance.
        self.name = tail or head
        self.path = path
        self.children = []
        self.file_size = 0
        self.total_size = 0
        self.total_nodes = 0
        # Try searching this directory.
        try:
            dir_list = os.listdir(path)
        except OSError:
            pass
        else:
            # Examine each object in this directory.
            for name in dir_list:
                path_name = os.path.join(path, name)
                if os.path.isdir(path_name):
                    # Create child nodes for subdirectories.
                    size_tree = SizeTree(callback, path_name)
                    self.children.append(size_tree)
                    self.total_size += size_tree.total_size
                    self.total_nodes += size_tree.total_nodes + 1
                elif os.path.isfile(path_name):
                    # Try getting the size of files.
                    try:
                        self.file_size += os.path.getsize(path_name)
                    except OSError:
                        pass
            # Add in the total file size to the total size.
            self.total_size += self.file_size

    def pop_child(self, name):
        "Return a named child or None if not found."
        for index, child in enumerate(self.children):
            if child.name == name:
                return self.children.pop(index)

    ########################################################################

    def __str__(self):
        "Return a representation of the tree formed by this object."
        lines = [self.path]
        self.__walk(lines, self.children, '')
        return '\n'.join(lines)

    @classmethod
    def __walk(cls, lines, children, prefix):
        "Generate lines based on children and keep track of prefix."
        dir_prefix, walk_prefix = prefix + '+---', prefix + '|   '
        for pos, neg, child in cls.__enumerate(children):
            if neg == -1:
                dir_prefix, walk_prefix = prefix + '\\---', prefix + '    '
            lines.append(dir_prefix + child.name)
            cls.__walk(lines, child.children, walk_prefix)

    @staticmethod
    def __enumerate(sequence):
        "Generate positive and negative indices for sequence."
        length = len(sequence)
        for count, value in enumerate(sequence):
            yield count, count - length, value

################################################################################

class Apply(tuple):

    "Create a container that can run a method from its contents."

    def __getattr__(self, name):
        "Get a virtual method to map and apply to the contents."
        return self.__Method(self, name)

    ########################################################################

    class __Method:

        "Provide a virtual method that can be called on the array."

        def __init__(self, array, name):
            "Initialize the method with array and method name."
            self.__array = array
            self.__name = name

        def __call__(self, *args, **kwargs):
            "Execute method on contents with provided arguments."
            name, error, buffer = self.__name, False, []
            for item in self.__array:
                attr = getattr(item, name)
                try:
                    data = attr(*args, **kwargs)
                except Exception as problem:
                    error = problem
                else:
                    if not error:
                        buffer.append(data)
            if error:
                raise error
            return tuple(buffer)

################################################################################

# Provide a way of converting byte sizes into strings.

def convert(number):
    "Convert bytes into human-readable representation."
    if not number:
        return '0 Bytes'
    assert 0 < number < 1 << 110, 'number out of range'
    ordered = reversed(tuple(format_bytes(partition_number(number, 1 << 10))))
    cleaned = ', '.join(item for item in ordered if item[0] != '0')
    return cleaned

def partition_number(number, base):
    "Continually divide number by base until zero."
    div, mod = divmod(number, base)
    yield mod
    while div:
        div, mod = divmod(div, base)
        yield mod

def format_bytes(parts):
    "Format partitioned bytes into human-readable strings."
    for power, number in enumerate(parts):
        yield '{} {}'.format(number, format_suffix(power, number))

def format_suffix(power, number):
    "Compute the suffix for a certain power of bytes."
    return (PREFIX[power] + 'byte').capitalize() + ('s' if number != 1 else '')

PREFIX = ' kilo mega giga tera peta exa zetta yotta bronto geop'.split(' ')

################################################################################

# Allow conversion of byte size strings back into numbers.

def parse(string):
    "Convert human-readable string back into bytes."
    total = 0
    for part in string.split(', '):
        number, unit = part.split(' ')
        s = number != '1' and 's' or ''
        for power, prefix in enumerate(PREFIX):
            if unit == (prefix + 'byte' + s).capitalize():
                break
        else:
            raise ValueError('{!r} not found!'.format(unit))
        total += int(number) * 1 << 10 * power
    return total

################################################################################

# Execute the main method if ran directly.

if __name__ == '__main__':
    GUISizeTree.main()