NameError: global name 'templatePrefix' is not defined

[ChameleonRed]

What does mean this bug and why it occurs?

N File "C:\Users\Crezary Wagner\Documents\GitHub\wikipedia-extractor\WikiExtractor.py", line 1896, in clean
ameError: global name 'templatePrefix' is not defined

[kloppjp]

Could you state your python version (type "python" into your command line), your OS and if any, which python environment you are using, e.g. Anaconda, Canopy etc.
It may also be helpful if you could post the entire bug report and check if your version is up to date as the line you are referring to does not contain any reference to the variable "templatePrefix".

[attardi]

This problem was reported before by someone using Python on Windows.
The variable templatePrefix is a global variable initialized from a value in the site info XML element.
It turned out to be a bug in the Python implementation of Windows, that does not handle globals as specified by the language.
The suggested patch was to add:
templatePrefix = ''
at the beginning of the script.

[SangdongWyverns]

@attardi
I faced same problem with @ChameleonRed and applied your solution but I show another bug like this.
File "C:\Python27\lib\multiprocessing\procss.py", line 258, in _bootstrap
self.run()
File "C:\Python27\lib\multiprocessing\procss.py", line 114, in run
self._target(self._args, *self._kwargs)
File D:\Download\WikiExtractor.py", line 2447, in reduce_process
output.write(ordering_buffer.pop(next_ordinal))
File D:\Download\WikiExtractor.py", line 2447, in write
self.reserve(len(data))
File D:\Download\WikiExtractor.py", line 2447, in reserve
if self.file.tell() + size > self.max_file_size:
ValueError: I/O operation on closed file.

[attardi]

That also happened before with Windows. Python implementation does not support properly StringIO.
I will put a notice that WikiExtractor might not run on Windows, due to bugs in the Python implementation.

[ChameleonRed]

$python --version
Python 2.7.9

Windows + Python 32.

[ChameleonRed]

$python
Python 2.7.9 (default, Dec 10 2014, 12:24:55) [MSC v.1500 32 bit (Intel)] on win32
Type "help", "copyright", "credits" or "license" for more information.

[ChameleonRed]

I have not problems with StringIO on Windows - so I think it is not StringIO myth.

Problem with variables is not StringIO I think - tell why do you think that StringIO explain it in details?

[attardi]

The problem with StringIO arises only when using it in a multiprocessing configuration. The error message is weird, saying the file has been closed.
I was told that it happens even before anything gets written to the file.
Can you confirm this?
If you can find another explanation, I would like to know.

[attardi]

The problem with the global variable templatePrefix is unrelated with StringIO.
If you look at the code, templatePrefix is assigned at the very beginning in function process_dump(), while reading the siteinfo header.
Its value is taken from the element <namespace key="10">, which must be present if templates are used.
You might check if your dump contains it, looking at the first few lines.

[attardi]

Fixed.

[ChameleonRed]

I will test it if fixed.