Popular recipes tagged "meta:loc=52"

How to Create a PDF with a Caustic Drawing (Python)

2017-06-18T17:43:47-07:00

Python recipe 580806 by Jorj X. McKie (fitz, mupdf, pdf, pymupdf).

Just a little demo on how to create simple drawings with PyMuPDF.

This script simulates what you see looking into your coffee mug, early in the morning after a long night of programming ...

Convert JSON to PDF with Python and xtopdf (Python)

2014-12-10T18:02:14-08:00

Python recipe 578979 by Vasudev Ram (json, pdfwriter, sys).

This recipe show the basic steps needed to convert JSON input to PDF output, using Python and xtopdf, a PDF creation toolkit. xtopdf is itself written in Pytho, and uses the ReportLab toolkit internally.

We set up some needed values, such as the output PDF file name, the font name and size, the header and footer, and the input lines for the body of the PDF output; all these values are passed in JSON format (in a single dictionary) to a function that uses those values to generate a PDF file with the desired content.

The code is intentionally kept simple so as to require the least amount of code needed to demonstrate the techniques involved. But it can be generalized or extended to more complex situations.

Urllib handler for Amazon S3 buckets (Python)

2014-11-06T18:31:44-08:00

Python recipe 578957 by Andrea Corbellini (aws, s3, urllib).

This is a handler for the standard urllib.request module capable of opening buckets stored on Amazon S3.

Here is an usage example:

>>> from urllib.request import build_opener
>>> opener = build_opener(S3Handler)
>>> response = opener.open('s3://bucket-name/key-name')
>>> response.read()
b'contents'

Python list of files and their path from folders and subfolders (Python)

2013-06-10T19:07:46-07:00

Python recipe 578557 by Sam Khan (file_io).

Look into a folder along with subfolders for a file starting with or ending with certain characters.

Password Generator (mkpasswd) (Python)

2013-07-31T23:23:02-07:00

Python recipe 578468 by James Mills (generator, mkpasswd, password, secure). Revision 3.

Since everyone is posting one of these, I thought I'd post mine. I wrote this many years ago and use it everywhere.

A class decorator for creating named tuples (Python)

2013-02-14T19:58:13-08:00

Python recipe 578456 by Eric Snow (metaprogramming, namedtuple). Revision 3.

This class decorator factory is useful for replacing the following:

class MyTuple(namedtuple('MyTuple', "a b c")):
    """Something special."""
    @classmethod
    def from_defaults(cls, a, b=None, c=5):
        return cls(a, b, c)

or even:

class MyTuple(namedtuple('MyTuple', "a b c")):
    """Something special."""
    def __new__(cls, a, b=None, c=5):
        return super().__new__(cls, a, b, c)

with this:

@as_namedtuple("a b c", None, c=5)
class MyTuple:
    """Something special."""

I found that I often subclass named tuples to add on some functionality or even just a nice docstring. Plus with the class syntax there's no missing that a class is bound to the name (and it's a little easier to search for the definition). When you subclass a named tuple the boilerplate involved really jumps out.

One of the main reasons Adding support for defaults to namedtuple would mitigate the need for that functionality here, but I'm not going to hold my breath on that.

One nice (though minor) thing is that you don't have to repeat the name when defining the namedtuple.

First Class Enums in Python (Python)

2013-03-07T08:23:46-08:00

Python recipe 578482 by Deepak (programs).

True immutable symbolic enumeration with qualified value access.

Create replica of the existing directory structure with only specified extension files. (Python)

2012-11-16T08:30:31-08:00

Python recipe 578303 by Achal Rastogi (bioinformatics, biology, directory, fileextensions, replica). Revision 2.

The program creates a replica of existing directory structure with specified extension files only. The program maintains the directory-sub-directory architecture while executing. User has to provide two arguments, First the path of existing directory,whose replica has to be created and Second, the path of directory, where the replica has to be created. This program is developed to fetch files with ".pl" (perl) extension, while maintaining the directory-sub-directory architecture. User can modify it, with his/her interested file extension, like ".txt", ".doc", etc.

Generator of combinations without replacement for a sequence using dynamic programming (Python)

2011-06-21T09:11:19-07:00

Python recipe 577766 by Filippo Squillace .

From the previous recipe http://code.activestate.com/recipes/577764-combinations-of-a-sequence-without-replacement-usi/ we can easily build a generator that return all the K-combinations without replacement.

Function Pipelines (Python)

2011-05-15T19:38:13-07:00

Python recipe 577696 by Alexandre Zani (events, pipelining, wsgi).

Pipelines can be used to chain a series of functions to process a piece of data. For instance you can build a pipeline to process web requests easily including some middleware for instance.

Axis POJO stripper. (Python)

2011-01-04T12:05:12-08:00

Python recipe 577533 by Chris Wolf (axis, pojo, wsdl2java).

This utility lets us use the 'wsdl2java' utility from Axis-1 to generate POJOs from the schema embedded in a WSDL. If we just want POJOs without the Axis marshalling/unmarshalling code, then this script will strip out the Axis code, leaving just the POJOs.

Simple tabulator (Python)

2010-11-09T12:50:06-08:00

Python recipe 577458 by Noufal Ibrahim (parsing, text_processing).

This is a simple script to covert a top to bottom list of items into a left to right list.

 a 
 b 
 c
 d
 e
 f
 g
 h
 i
 j
 k
 l
 m

into

 a  b  c  d  e  f  g
 h  i  j  k  l  m

A few command line options allow some amount of customisation.

Benford's Law demo (Python)

2010-10-19T10:56:51-07:00

Python recipe 577431 by Glenn Hutchings (benford, matplotlib, plotting).

Here's a simple program to demonstrate Benford's Law, which also shows the simple power of matplotlib. It reads from a bunch of files (or stdin, if none specified), extracts the leading digits of all number-like strings found, and plots the distribution in a window together with the expected result if Benford's law applies.

Maclaurin's_series_sin (Python)

2010-07-07T12:05:33-07:00

Python recipe 577287 by Fouad Teniou (mathematics).

C. Maclaurin. A Scottish mathematician gained his master degree at age 17, and his major mathematics' work arise from his special knowledge in Newton's ideas and the formulation of Newton's methods.

However, C. Maclaurin also contributed to the astronomy science and helped to improve maps and invented some mechanical devices.

My mathematics python's programs is a set of Maclaurin's series to compute some of the most important functions in calculus.

Though, the computation of an infinite sum which give the value of a function in terms of the derivatives evaluated at a special case where x0 = 0,in contrast with Taylor series.

It is assumed that the angle is expressed in radian while using the Maclaurin's series to approximate the trigonometric functions sine and cosine, thus, converting the angle into degrees in my program could be useful for students who prefer using degrees.

Maclaurin's_series_cosh-1(x) (Python)

2010-09-28T11:53:08-07:00

Python recipe 577400 by Fouad Teniou (mathematics).

C. Maclaurin. A Scottish mathematician gained his master degree at age 17, and his major mathematics' work arise from his special knowledge in Newton's ideas and the formulation of Newton's methods.

However, C. Maclaurin also contributed to the astronomy science and helped to improve maps and invented some mechanical devices .

My mathematics python's programs is a set of Maclaurin's series to compute some of the most important functions in calculus.

Though, the computation of an infinite sum which give the value of a function in terms of the derivatives evaluated at a special case where x0 = 0,in contrast with Taylor's series.

Natural logarithms are used to compute inverse hyperbolic functions.

Extension to Python 3 Counter class (Python)

2010-08-18T21:02:41-07:00

Python recipe 577362 by Paddy McCarthy (bag, counter, multiset, python). Revision 3.

Adds symmetric difference and cartesian product to the Counter class. I had a use case for the former and Raymond H. asked about the latter so I coded the latter from its Wikipedia description.

Maclaurin's_series_cos (Python)

2010-07-07T11:56:52-07:00

Python recipe 577285 by Fouad Teniou (mathematics). Revision 2.

Maclaurin. A Scottish mathematician gained his master degree at age 17, and his major mathematics' work arise from his special knowledge in Newton's ideas and the formulation of Newton's methods.

However, C. Maclaurin also contributed to the astronomy science and helped to improve maps and invented some mechanical devices .

My mathematics python's programs is a set of Maclaurin's series to compute some of the most important functions in calculus.

Though, the computation of an infinite sum which give the value of a function in terms of the derivatives evaluated at a special case where x0 = 0,in contrast with Taylor series.

Maclaurin's_series_cos(2x) (Python)

2010-08-03T12:23:33-07:00

Python recipe 577344 by Fouad Teniou (mathematics). Revision 2.

C. Maclaurin. A Scottish mathematician gained his master degree at age 17, and his major mathematics' work arise from his special knowledge in Newton's ideas and the formulation of Newton's methods.

However, C. Maclaurin also contributed to the astronomy science and helped to improve maps and invented some mechanical devices .

My mathematics python's programs is a set of Maclaurin's series to compute some of the most important functions in calculus.

Though, the computation of an infinite sum which give the value of a function in terms of the derivatives evaluated at a special case where x0 = 0,in contrast with Taylor series.

There are several ways of finding Maclaurin’s series, and I used the multiplication and the division to develop my own maclaurin’s series for cos(2x) and cos²(x).

Cos(2x) = 2cos²(x) - 1 and cos²(x) = (cos(2x)+1)/2

However, integration and differentiation could also be used to find Maclaurin’s series.

Komodo Macro - Copy to clipboard code selection in HTML format (JavaScript)

2010-04-14T07:17:59-07:00

JavaScript recipe 577193 by Davide Ficano (clipboard, html, komodo, macro).

This macro makes easy to paste on documents (MS Office, Open Office, iWorks Pages) code snippets with syntax highlight and/or line numbers.

This macro copies the selected code text or whole document if no selection is present on clipboard in HTML format.

On OSX you need at least Komodo 6 because previous versions don't support data flavors

Validating Emails (PHP)

2011-06-13T15:10:47-07:00

PHP recipe 577198 by Jonathan Fenech (emails, validating). Revision 2.

a small script that can be used for Validating Emails on

Login pages
forums

changed to preg_match from eregi function. now scripted validates everything typed in input boxes

Old Code =

       foreach($Email as $Emails)
   { // checks Emails - .net , .com , .au  & etc
   if(eregi("[a-zA-Z0-9]@+[a-z].{1,}com$",trim($Emails))|| eregi(            
       "[a-zA-Z0-9]@+[a-z].{1,}net$",trim($Emails)))

New Code =

       foreach($Email as $Emails)
   { // checks Emails - .net , .com , .au  & etc
   if(!preg_match("/^[_\.0-9a-zA-Z-]+@([0-9a-zA-Z]
   [0-9a-zA-Z-]+\.)+[a-zA-Z]{2,6}$/i", $Emails))

i changed from eregi function to preg_match function because eregi was taking out of PHP version 5.3.0 and 5.3.5.