Python For Loop over XML node List not a sequence

Question

I am relatively new to python and having trouble some trouble looping over a nodes children using xml.dom. I want to do this:

dom = parse("synth_options.xml")
root = dom.documentElement
child_nodes = root.childNode

for index, node in child_nodes:
    #do stuff with index and node

However, I get this error:

Traceback (most recent call last):
  File "synth.py", line 142, in <module>
    for index, node in child_nodes:
TypeError: iteration over non-sequence

Strangely, this works:

for node in child_nodes:
    #do stuff with index and node

I can post more code if it would be helpful, but I don't think there is anything else relevant. Thanks in advance.

aIKid · Accepted Answer · 2013-11-06 02:35:20Z

4

If you want to get both the index and the value, you can use enumerate:

for index, node in enumerate(child_nodes):

enumerate returns a tuple of the list indices and values.

Example of use:

>>> l = ['a', 'b', 'c']
>>> for index, value in enumerate(l):
    print index, value


0 a
1 b
2 c

Hope this helps!

edited Nov 6, 2013 at 2:35

answered Nov 6, 2013 at 2:29

aIKid

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1 Comment

user2958684 Over a year ago

I can't accept your answer yet, but this works. Why exactly is this necessary?

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