'''
Py2XML - Python to XML serialization
This code transforms a Python data structures into an XML document
Usage:
serializer = Py2XML()
xml_string = serializer.parse( python_object )
print python_object
print xml_string
'''
class Py2XML():
def __init__( self ):
self.data = "" # where we store the processed XML string
def parse( self, pythonObj, objName=None ):
'''
processes Python data structure into XML string
needs objName if pythonObj is a List
'''
if pythonObj == None:
return ""
if isinstance( pythonObj, dict ):
self.data = self._PyDict2XML( pythonObj )
elif isinstance( pythonObj, list ):
# we need name for List object
self.data = self._PyList2XML( pythonObj, objName )
else:
self.data = "<%(n)s>%(o)s</%(n)s>" % { 'n':objName, 'o':str( pythonObj ) }
return self.data
def _PyDict2XML( self, pyDictObj, objName=None ):
'''
process Python Dict objects
They can store XML attributes and/or children
'''
tagStr = "" # XML string for this level
attributes = {} # attribute key/value pairs
attrStr = "" # attribute string of this level
childStr = "" # XML string of this level's children
for k, v in pyDictObj.items():
if isinstance( v, dict ):
# child tags, with attributes
childStr += self._PyDict2XML( v, k )
elif isinstance( v, list ):
# child tags, list of children
childStr += self._PyList2XML( v, k )
else:
# tag could have many attributes, let's save until later
attributes.update( { k:v } )
if objName == None:
return childStr
# create XML string for attributes
for k, v in attributes.items():
attrStr += " %s=\"%s\"" % ( k, v )
# let's assemble our tag string
if childStr == "":
tagStr += "<%(n)s%(a)s />" % { 'n':objName, 'a':attrStr }
else:
tagStr += "<%(n)s%(a)s>%(c)s</%(n)s>" % { 'n':objName, 'a':attrStr, 'c':childStr }
return tagStr
def _PyList2XML( self, pyListObj, objName=None ):
'''
process Python List objects
They have no attributes, just children
Lists only hold Dicts or Strings
'''
tagStr = "" # XML string for this level
childStr = "" # XML string of children
for childObj in pyListObj:
if isinstance( childObj, dict ):
# here's some Magic
# we're assuming that List parent has a plural name of child:
# eg, persons > person, so cut off last char
# name-wise, only really works for one level, however
# in practice, this is probably ok
childStr += self._PyDict2XML( childObj, objName[:-1] )
else:
for string in childObj:
childStr += string;
if objName == None:
return childStr
tagStr += "<%(n)s>%(c)s</%(n)s>" % { 'n':objName, 'c':childStr }
return tagStr
def main():
python_object = {'documents': [{'formats': [{'info': {'uri': 'http://www.python.org/newness-of-python.pdf', 'pages': '245'}, 'type': 'pdf'}, {'info': {'uri': 'http://www.python.org/newness-of-python.html'}, 'type': 'web'}], 'copyright': {'url': 'http://www.creativecommons.org/', 'date': 'June 24, 2009', 'type': 'CC'}, 'title': 'The Newness of Python', 'date': 'June 6, 2009', 'text': ['Python is very nice. Very, very nice.'], 'author': 'John Doe'}]}
serializer = Py2XML()
xml_string = serializer.parse( python_object )
print python_object
print xml_string
if __name__ == '__main__':
main()
Diff to Previous Revision
--- revision 1 2010-06-16 11:06:47
+++ revision 2 2010-06-16 20:26:21
@@ -4,116 +4,116 @@
This code transforms a Python data structures into an XML document
Usage:
- serializer = Py2XML()
- xml_string = serializer.parse( python_object )
- print python_object
- print xml_string
+ serializer = Py2XML()
+ xml_string = serializer.parse( python_object )
+ print python_object
+ print xml_string
'''
class Py2XML():
- def __init__( self ):
+ def __init__( self ):
- self.data = "" # where we store the processed XML string
+ self.data = "" # where we store the processed XML string
- def parse( self, pythonObj, objName=None ):
- '''
- processes Python data structure into XML string
- needs objName if pythonObj is a List
- '''
- if pythonObj == None:
- return ""
+ def parse( self, pythonObj, objName=None ):
+ '''
+ processes Python data structure into XML string
+ needs objName if pythonObj is a List
+ '''
+ if pythonObj == None:
+ return ""
- if isinstance( pythonObj, dict ):
- self.data = self._PyDict2XML( pythonObj )
-
- elif isinstance( pythonObj, list ):
- # we need name for List object
- self.data = self._PyList2XML( pythonObj, objName )
-
- else:
- self.data = "<%(n)s>%(o)s</%(n)s>" % { 'n':objName, 'o':str( pythonObj ) }
-
- return self.data
+ if isinstance( pythonObj, dict ):
+ self.data = self._PyDict2XML( pythonObj )
+
+ elif isinstance( pythonObj, list ):
+ # we need name for List object
+ self.data = self._PyList2XML( pythonObj, objName )
+
+ else:
+ self.data = "<%(n)s>%(o)s</%(n)s>" % { 'n':objName, 'o':str( pythonObj ) }
+
+ return self.data
- def _PyDict2XML( self, pyDictObj, objName=None ):
- '''
- process Python Dict objects
- They can store XML attributes and/or children
- '''
- tagStr = "" # XML string for this level
- attributes = {} # attribute key/value pairs
- attrStr = "" # attribute string of this level
- childStr = "" # XML string of this level's children
+ def _PyDict2XML( self, pyDictObj, objName=None ):
+ '''
+ process Python Dict objects
+ They can store XML attributes and/or children
+ '''
+ tagStr = "" # XML string for this level
+ attributes = {} # attribute key/value pairs
+ attrStr = "" # attribute string of this level
+ childStr = "" # XML string of this level's children
- for k, v in pyDictObj.items():
+ for k, v in pyDictObj.items():
- if isinstance( v, dict ):
- # child tags, with attributes
- childStr += self._PyDict2XML( v, k )
+ if isinstance( v, dict ):
+ # child tags, with attributes
+ childStr += self._PyDict2XML( v, k )
- elif isinstance( v, list ):
- # child tags, list of children
- childStr += self._PyList2XML( v, k )
+ elif isinstance( v, list ):
+ # child tags, list of children
+ childStr += self._PyList2XML( v, k )
- else:
- # tag could have many attributes, let's save until later
- attributes.update( { k:v } )
+ else:
+ # tag could have many attributes, let's save until later
+ attributes.update( { k:v } )
- if objName == None:
- return childStr
+ if objName == None:
+ return childStr
- # create XML string for attributes
- for k, v in attributes.items():
- attrStr += " %s=\"%s\"" % ( k, v )
+ # create XML string for attributes
+ for k, v in attributes.items():
+ attrStr += " %s=\"%s\"" % ( k, v )
- # let's assemble our tag string
- if childStr == "":
- tagStr += "<%(n)s%(a)s />" % { 'n':objName, 'a':attrStr }
- else:
- tagStr += "<%(n)s%(a)s>%(c)s</%(n)s>" % { 'n':objName, 'a':attrStr, 'c':childStr }
+ # let's assemble our tag string
+ if childStr == "":
+ tagStr += "<%(n)s%(a)s />" % { 'n':objName, 'a':attrStr }
+ else:
+ tagStr += "<%(n)s%(a)s>%(c)s</%(n)s>" % { 'n':objName, 'a':attrStr, 'c':childStr }
- return tagStr
+ return tagStr
- def _PyList2XML( self, pyListObj, objName=None ):
- '''
- process Python List objects
- They have no attributes, just children
- Lists only hold Dicts or Strings
- '''
- tagStr = "" # XML string for this level
- childStr = "" # XML string of children
+ def _PyList2XML( self, pyListObj, objName=None ):
+ '''
+ process Python List objects
+ They have no attributes, just children
+ Lists only hold Dicts or Strings
+ '''
+ tagStr = "" # XML string for this level
+ childStr = "" # XML string of children
- for childObj in pyListObj:
-
- if isinstance( childObj, dict ):
- # here's some Magic
- # we're assuming that List parent has a plural name of child:
- # eg, persons > person, so cut off last char
- # name-wise, only really works for one level, however
- # in practice, this is probably ok
- childStr += self._PyDict2XML( childObj, objName[:-1] )
- else:
- for string in childObj:
- childStr += string;
+ for childObj in pyListObj:
+
+ if isinstance( childObj, dict ):
+ # here's some Magic
+ # we're assuming that List parent has a plural name of child:
+ # eg, persons > person, so cut off last char
+ # name-wise, only really works for one level, however
+ # in practice, this is probably ok
+ childStr += self._PyDict2XML( childObj, objName[:-1] )
+ else:
+ for string in childObj:
+ childStr += string;
- if objName == None:
- return childStr
+ if objName == None:
+ return childStr
- tagStr += "<%(n)s>%(c)s</%(n)s>" % { 'n':objName, 'c':childStr }
+ tagStr += "<%(n)s>%(c)s</%(n)s>" % { 'n':objName, 'c':childStr }
- return tagStr
+ return tagStr
def main():
- python_object = {'documents': [{'formats': [{'info': {'uri': 'http://www.python.org/newness-of-python.pdf', 'pages': '245'}, 'type': 'pdf'}, {'info': {'uri': 'http://www.python.org/newness-of-python.html'}, 'type': 'web'}], 'copyright': {'url': 'http://www.creativecommons.org/', 'date': 'June 24, 2009', 'type': 'CC'}, 'title': 'The Newness of Python', 'date': 'June 6, 2009', 'text': ['Python is very nice. Very, very nice.'], 'author': 'John Doe'}]}
-
- serializer = Py2XML()
- xml_string = serializer.parse( python_object )
- print python_object
- print xml_string
+ python_object = {'documents': [{'formats': [{'info': {'uri': 'http://www.python.org/newness-of-python.pdf', 'pages': '245'}, 'type': 'pdf'}, {'info': {'uri': 'http://www.python.org/newness-of-python.html'}, 'type': 'web'}], 'copyright': {'url': 'http://www.creativecommons.org/', 'date': 'June 24, 2009', 'type': 'CC'}, 'title': 'The Newness of Python', 'date': 'June 6, 2009', 'text': ['Python is very nice. Very, very nice.'], 'author': 'John Doe'}]}
+
+ serializer = Py2XML()
+ xml_string = serializer.parse( python_object )
+ print python_object
+ print xml_string
if __name__ == '__main__':
- main()
+ main()
