C:\Windows\system32>pip install git+https://github.com/pythonnet/pythonnet
Collecting git+https://github.com/pythonnet/pythonnet
Cloning https://github.com/pythonnet/pythonnet to c:\users\denis~1.akh\appdata\local\temp\pip-so1nbo-build
Requirement already satisfied (use --upgrade to upgrade): pythonnet==2.4.0.dev0 from git+https://github.com/pythonnet/pythonnet in c:\python\python27-32\lib\site-packages
C:\Windows\system32>pip install git+https://github.com/pythonnet/pythonnet -U
Collecting git+https://github.com/pythonnet/pythonnet
Cloning https://github.com/pythonnet/pythonnet to c:\users\denis~1.akh\appdata\local\temp\pip-ytahwe-build
Installing collected packages: pythonnet
Found existing installation: pythonnet 2.4.0.dev0
Uninstalling pythonnet-2.4.0.dev0:
Successfully uninstalled pythonnet-2.4.0.dev0
Running setup.py install for pythonnet ... error
Complete output from command c:\python\python27-32\python.exe -u -c "import setuptools, tokenize;__file__='c:\\users\\denis~1.akh\\appdata\\local\\temp\\pip-ytahwe-build\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record c:\users\denis~1.akh\appdata\local\temp\pip-3dupcl-record\install-record.txt --single-version-externally-managed --compile:
usage: -c [global_opts] cmd1 [cmd1_opts] [cmd2 [cmd2_opts] ...]
or: -c --help [cmd1 cmd2 ...]
or: -c --help-commands
or: -c cmd --help
error: option --single-version-externally-managed not recognized
----------------------------------------
Rolling back uninstall of pythonnet
Command "c:\python\python27-32\python.exe -u -c "import setuptools, tokenize;__file__='c:\\users\\denis~1.akh\\appdata\\local\\temp\\pip-ytahwe-build\\setup.py';f=getattr(tokenize, 'open', open)(__file__);code=f.read().replace('\r\n', '\n');f.close();exec(compile(code, __file__, 'exec'))" install --record c:\users\denis~1.akh\appdata\local\temp\pip-3dupcl-record\install-record.txt --single-version-externally-managed --compile" failed with error code 1 in c:\users\denis~1.akh\appdata\local\temp\pip-ytahwe-build\
Running Python 3.8.5 with Mono 6.10.0 on OSX Catalina, as able to get pip install pythonnet by setting a PKG_CONFIG_PATH as below. Hope this helps!
export PKG_CONFIG_PATH=/Library/Frameworks/Mono.framework/Versions/Current/lib/pkgconfigI’m using Python 3.8.1 with pip 20.0.2 on Windows 10, and when I do a “pip install pythonnet”, I still get --single-version-externally-managed not recognized.