TypeError: 'in <string>' requires string as left operand, not Element

MRAB python at mrabarnett.plus.com
Mon Dec 10 03:42:50 CET 2012

On 2012-12-10 01:19, Dave Angel wrote:
> On 12/09/2012 07:52 PM, Victor Hooi wrote:
>> Hi,
>> I'm getting a strange error when I try to run the following:
>>     for root, dirs, files in os.walk('./'):
>>         for file in files:
>>             if file.startswith('ml') and file.endswith('.xml') and 'entity' not in file:
>>                 print(root)
>>                 print(file)
>>                 with open(os.path.join(root, file), 'r') as f:
>>                     print(f.name)
>>                     try:
>>                         tree = etree.parse(f)
>>                         root = tree.getroot()
>>                         print(f.name)
>>                         print(root.tag)
>>                     except xml.parsers.expat.ExpatError as e:
>>                         print('Unable to parse file {0} - {1}'.format(f.name, e.message))
> Where's the printout of the root and file variables?  You're asking
> os.path.join to work on them, and it's clearly upset about their types.
> I see print statements, so you clearly were thinking along these lines.
> But you don't show them.  BTW, I'd be using  print(repr(root)) and
> print(repr(file)) instead, so you get a better idea of their type and value.
> My guess for the problem is that you're trashing 'root' with the
> contents of your try block.  Try using a different name for the xml stuff.
>> The error is:
>> Traceback (most recent call last):
>>   File "foo.py", line 275, in <module>
>>     marketlink_configfiles()
>>   File "foo.py", line 83, in bar
>>     with open(os.path.join(root, file), 'r') as f:
>>   File "C:\Python27\lib\ntpath.py", line 97, in join
>>     if path[-1] in "/\\":
>> TypeError: 'in <string>' requires string as left operand, not Element
>> Cheers,
>> Victor
> Incidentally, 'file' is a builtin type, so it's probably not a good idea
> to hide it by using it as your own local variable.
It looks like Python 3 to me, which doesn't define 'file'.

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