resolves visual studio FileNotFoundError: [Errno 2]

[beekalam]

resolves visual studio FileNotFoundError: [Errno 2] No such file or directory:
'path_to_python_src\py\makeversionhdr.py/docs/conf.py'

this happens because of windows \ separators

[stinos]

Can you elaborate on the error a bit (when does it occur, what does VS have to do with it)

'path_to_python_src\py\makeversionhdr.py/docs/conf.py'
this happens because of windows \ separators

That seems unlikely - from that info the problem rather seems that a request is made to access the file conf.py in a directory 'somepath\py\makeversionhdr.py/docs', and that directory obviously does not exist. Moreover most programs on windows have no problems working with both '/' and '' slashes, and python is one of those. For example you can run python py/makeversionhdr.py path/to\file just as well as python py\makeversionhdr.py path\to/file

[beekalam]

makeversionhdr.py is called in genhdr.targets(which visual studio calls at build time) at line 12 we have:
.... Exec Command="python $(PySrcDir)makeversionhdr.py $(TmpFile)" ...

the path to makeversionhdr.py is passed to python from visual studio like this:
drive:\path\to\file

then the line of code at(makversionhdr.py):

def get_version_info_from_docs_conf():
with open("%s/docs/conf.py" % sys.argv[0].rsplit("/", 2)[0]) as f:

tries to open the following file(which is the wrong path):
'D:\githubrepos\clone\micropython\py\makeversionhdr.py/docs/conf.py'

Although python is intelligent enough to distinguish path separators.But at the above line we are
using string functions.
This is the full traceback from my visual studio:
qstrdefs.h
1> Traceback (most recent call last):
1> File "D:\githubrepos\clone\micropython\py\makeversionhdr.py", line 113, in
1> make_version_header(sys.argv[1])
1> File "D:\githubrepos\clone\micropython\py\makeversionhdr.py", line 81, in make_version_header
1> info = get_version_info_from_docs_conf()
1> File "D:\githubrepos\clone\micropython\py\makeversionhdr.py", line 66, in get_version_info_from_docs_conf
1> with open("%s/docs/conf.py" % sys.argv[0].rsplit("/", 2)[0]) as f:
1> FileNotFoundError: [Errno 2] No such file or directory: 'D:\githubrepos\clone\micropython\py\makeversionhdr.py/docs/conf.py'
1>D:\githubrepos\clone\micropython\windows\msvc\genhdr.targets(39,5): error MSB3073: The command "python D:\githubrepos\clone\micropython\py\makeversionhdr.py D:\githubrepos\clone\micropython\windows\msvc\build\genhdr\mpversion.h.tmp" exited with code 1.

[pfalcon]

Ok, so the right fix is to use os.path.dirname() instead of str.rsplit().

[pfalcon]

This was handled as part of #1538.