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mt.exe could not be found using Visual Studio 2015 #254
Description
I'm trying to use Visual Studio 2015 python support but I cannot install through pip. I get this error
File "C:\Users\adegeo\AppData\Local\Temp\pip-build-qas0tfba\pythonnet\setup.py", line 95, in _find_msbuild_tool
raise RuntimeError("%s could not be found" % tool)
RuntimeError: mt.exe could not be found
How can I fix this?
Activity
den-run-ai commentedon Aug 31, 2016
can't you pip install from wheel (.whl)? mt.exe is only used when it is
compiling it locally. if you are intentionally building from source, then
do you even have mt.exe on your machine? what is the path to mt.exe? if
not, then you can get it with WinSDK or C++ build tools for VS.
if you are still getting issues, then what is your python version?
On Wed, Aug 31, 2016 at 2:37 PM, Andy De George notifications@github.com
wrote:
Thraka commentedon Aug 31, 2016
So I created a new Python project in visual studio. Created a new venv for the project and then right-click > install package > pythonnet and it fails to install via pip.
Do you mean to suggest that I should download the .whl file and install it through pip directly instead of just using
pip install pythonnet?Thraka commentedon Aug 31, 2016
Interesting.. I ran upgrade pip in visual studio and it went from version 7 to 8, tried to install and it worked fine. Odd. Closing.
AlexCatarino commentedon Jun 20, 2018
@denfromufa, mt.exe is used to create the manifest in Windows. Is it really necessary? If I want to install pythonnet locally, do I need to install "Visual C++ for Python"?
I made this change in setup.py to avoid this requirement:
AlexCatarino@dbfcf73
den-run-ai commentedon Jun 20, 2018
@AlexCatarino manifest is needed to avoid CPython runtime crash due to incompatibility in MSVC runtime version:
#45
So pythonnet will work normally but fail very badly in other cases due to subtle issues with MSVC runtime WITHOUT manifest. This is quite common with Anaconda.
AlexCatarino commentedon Jun 20, 2018
Thank you, @denfromufa!
den-run-ai commentedon Nov 29, 2018
@AlexCatarino here is how to avoid using mt.exe, probably worth investigating to avoid dependance on C/C++ build tools:
https://stackoverflow.com/a/422063/2230844