simple XML question

askalottaqs

i know it's quite simple, but i looked around for hours and i dont seem to be able to get it, excuse my nubiness pleaseeee

i need to parse an xml document, to take out the values inside since i'm using it as a database,

here's a sample xml file

<?xml version="1.0" ?><amman Address="3rd area" Hazard="weapons" Name="third" Owner="tarik" Phone="6453222" PhotoAddress="C:\Users\tarik\Desktop\DSC_0018.jpg" PrevUsed="project1" />

i need to extract the values just as a string, so if i ask for address ill just get 3rd area

supposing the XML file is located at c:/tempDB

eternally grateful for an answer!!

T

Hackworth

I'm not familiar with XML myself but I think this should get you started.

Using xml.dom.minidom (http://docs.python.org/library/xml.dom.minidom.html) you can parse a file which should return a Document object which is documented here. You can then (I believe) use the Document methods to grab elements and values and the like.

Hope this helps!

bvdet

I have done some XML parsing, and it was not simple to me! The following will parse the document into a dictionary:

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 from xml.dom.minidom import parseString
 
xmlStr = '''<?xml version="1.0" ?>

    <amman Address="3rd area"

           Hazard="weapons"

           Name="third"

           Owner="tarik"

           Phone="6453222"

           PhotoAddress="C:\Users\tarik\Desktop\DSC_0018.jpg"

           PrevUsed="project1" />'''
 
xmlDoc = parseString(xmlStr)
 
def getNodeDict(doc, dd={}):

    '''Return a dictionary of node names and attribute names and values

    found in an XML document parseString instance. The keys are the node

    names and each value is a list of dictionaries (a list is used since an

    XML document can have multiple nodes with the same name). The keys of

    each dictionary in the list are the attribute names and the values are

    the attribute values. All keys and values are converted to regular

    strings.'''

    if doc == None: return None

    for child in doc.childNodes:

        # Skip all nodes except ELEMENT_NODE

        if child.nodeType == 1:

            # dict of attribute/values

            s = child.attributes

            if s:

                dd.setdefault(str(child.nodeName),

                              []).append(dict(zip([str(item) for item in s.keys()],

                                                   [str(item.value) for item in s.values()])))

            if child.hasChildNodes():

                dd = self.getNodeDict(child, dd)

    return dd
 
print
 
for key, value in getNodeDict(xmlDoc).items():

    print "Node Name: %s" % (key)

    print "Attributes:"

    for item in value:

        for x in item:

            print '    %s: %s' % (x, item[x])

Output:

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 >>> 

Node Name: amman

Attributes:

    PrevUsed: project1

    Name: third

    Hazard: weapons

    PhotoAddress: C:\Users arik\Desktop\DSC_0018.jpg

    Phone: 6453222

    Address: 3rd area

    Owner: tarik

>>>

This code has not been tested on anything other than your document.

askalottaqs

i cant thank you enough!!! i bow before you master,

i shall try the code tomorrow i hope cause it's darn late here,

thanks again

T

askalottaqs

couldnt sleep without trying it!

first of all, it works perfectly, i dont know how to thank you,

but the boring part is, can i ask a couple of questions concerning?

if child.nodeType == 1: # very clear, but how do i get a reference of what this might return? i've read XML documents and ive read MINIDOM documents, but the gap in between of what to use where, how do you recommend i understand that?

dd.setdefault(str(child.nodeName),[]).append(dict(zip([str(item) for item in s.keys()],
[str(item.value) for item in s.values()])))
#i get how it's working, but this is an out of place question, how do i understand functions like "setdefault" and "zip" ? i mean the documantation can only get u this much, then it ends up losing u! i recently moved from Autodesk|Maya's python, and working on programming more OS stuff,

thank you so much for your help!

T

bvdet

To begin with, I like this website for learning the basics of XML.

There are several types of nodes, one type being ELEMENT_NODE.

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 >>> xmlDoc.ELEMENT_NODE

1

>>> xmlDoc.firstChild.nodeType

1

To see a list of the available attributes of an XML document parseString instance:

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 >>> for item in dir(xmlDoc):

...     print item

...     

ATTRIBUTE_NODE

CDATA_SECTION_NODE

COMMENT_NODE

DOCUMENT_FRAGMENT_NODE

DOCUMENT_NODE................................

Built-in function dict() returns a dictionary. Built-in function zip() returns a list of tuples, where the i-th tuple contains the i-th element from each of the argument sequences. Example:

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 >>> s1 = [1,2,3]

>>> s2 = ['a','b','c']

>>> zip(s1, s2)

[(1, 'a'), (2, 'b'), (3, 'c')]

>>> dict(zip(s1,s2))

{1: 'a', 2: 'b', 3: 'c'}

>>>

Dictionary method setdefault(key[, x]) returns the value of the dictionary key if the key exists, otherwise returns x and sets the dictionary key to x. Example:

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 >>> dd = dict(zip(s1,s2))

>>> dd.setdefault(3, [])

'c'

>>> dd.setdefault(4, [])

[]

>>> dd

{1: 'a', 2: 'b', 3: 'c', 4: []}

>>> dd.setdefault(4, []).append('d')

>>> dd

{1: 'a', 2: 'b', 3: 'c', 4: ['d']}

>>>

askalottaqs

could not have been clearer! thank you master

cheers

T

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