Roumen Petrov <bugtr...@roumenpetrov.info> added the comment:

The issue is related to MAXPATHLEN limit and how is implemented . One part of 
request are already closed , another part wait . Some people port patches other 
wrote that would not use very long path. I'm in the second group.

This buildbot use path with length 54 and since build tree is detected and to 
this path code adds  'build'. For installed python  code will use TEMP 
environment variable.
The test are run in subdir test_python_${PID} and depending of PID the path is 
with different length. Note this.

So try to reproduce with installed python and TEMP set to path like this 
C:\12345678\12345678\12345678\12345678\12345678\12345678 and run test. The 
limit of 260(-1) will be reached and FileNotFoundError will be raised.
The default value of TEMP is to short to trigger error.

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Python tracker <rep...@bugs.python.org>
<http://bugs.python.org/issue14599>
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