[Windows] NoPythonVersion: Python interpreter is not found on the system.

• I have searched the issue tracker and believe that this is not a duplicate.

Make sure you run commands with -v flag before pasting the output.

Steps to reproduce

I’m using Windows machine. I installed PDM with pip in Python3.7 version. I run pdm sync and it returns

Traceback (most recent call last):
  File "c:\users\cye1\anaconda3\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\cye1\anaconda3\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\Scripts\pdm.exe\__main__.py", line 7, in <module>
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\core.py", line 233, in main
    return Core().main(args)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\core.py", line 168, in main
    raise cast(Exception, err).with_traceback(traceback)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\core.py", line 163, in main
    f(options.project, options)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\cli\commands\run.py", line 280, in handle
    sys.exit(runner.run(options.command, options.args))
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\cli\commands\run.py", line 220, in run
    [command] + args, **self.global_options  # type: ignore
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\cli\commands\run.py", line 98, in _run_process
    project_env = project.environment
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\project\core.py", line 224, in environment
    self._environment = self.get_environment()
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\project\core.py", line 219, in get_environment
    return Environment(self)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\models\environment.py", line 75, in __init__
    self.interpreter: PythonInfo = project.python
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\project\core.py", line 157, in python
    self._python = self.resolve_interpreter()
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\project\core.py", line 195, in resolve_interpreter
    for py_version in self.find_interpreters():
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\project\core.py", line 610, in find_interpreters
    for entry in finder.find_all(*args):
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\findpython\finder.py", line 94, in find_all
    matched_python = set(self._find_all_python_versions())
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\findpython\finder.py", line 127, in _find_all_python_versions
    yield from provider.find_pythons()
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\findpython\providers\path.py", line 25, in find_pythons
    yield from self.find_pythons_from_path(path)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\findpython\providers\base.py", line 50, in <genexpr>
    if path_is_python(child)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\findpython\utils.py", line 93, in path_is_python
    if not path_is_readable(path) or not path.is_file():
  File "c:\users\cye1\anaconda3\lib\pathlib.py", line 1382, in is_file
    return S_ISREG(self.stat().st_mode)
  File "c:\users\cye1\anaconda3\lib\pathlib.py", line 1178, in stat
    return self._accessor.stat(self)
OSError: [WinError 1920] The file cannot be accessed by the system: 'C:\\Users\\cye1\\AppData\\Local\\Microsoft\\WindowsApps\\MicrosoftEdge.exe'

I have no idea why MicrosoftEdge is involved in this scenario. 😂

I figured it could be due to my messy Python environment, so I installed Python3.9 and tried to use pdm use -v C:/Users/cye1/AppData/Local/Programs/Python/Python39/python to let PDM use the new Python3.9. It shows (see Actual behavior)

Actual behavior

Traceback (most recent call last):
  File "c:\users\cye1\anaconda3\lib\runpy.py", line 193, in _run_module_as_main
    "__main__", mod_spec)
  File "c:\users\cye1\anaconda3\lib\runpy.py", line 85, in _run_code
    exec(code, run_globals)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\Scripts\pdm.exe\__main__.py", line 7, in <module>
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\core.py", line 233, in main
    return Core().main(args)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\core.py", line 168, in main
    raise cast(Exception, err).with_traceback(traceback)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\core.py", line 163, in main
    f(options.project, options)
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\cli\commands\use.py", line 30, in handle
    project, options.python, options.first, options.ignore_remembered
  File "C:\Users\cye1\AppData\Roaming\Python\Python37\site-packages\pdm\cli\actions.py", line 563, in do_use
    raise NoPythonVersion("Python interpreter is not found on the system.")
pdm.exceptions.NoPythonVersion: Python interpreter is not found on the system.

Expected behavior

PDM to recognize the Python3.9 interpreter and use it smoothly.

Environment Information

It shows the OSError again when I run pdm info && pdm info --env

# Paste the output of `pdm info && pdm info --env` below:
$ pdm info && pdm info --env
[OSError]: [WinError 1920] The file cannot be accessed by the system: 'C:\\Users\\cye1\\AppData\\Local\\Microsoft\\WindowsApps\\MicrosoftEdge.exe'
Add '-v' to see the detailed traceback

Maybe my PDM is not installed properly? Thanks for your help! 🥰

[frostming]

This issue should be fixed in the new release of findpython, and those executables will be skipped.

[cye18]

For anyone who has the issue as well, I uninstalled and reinstalled PDM using pip install pdm. findpython==0.1.3 was installed by default, so the error still happened. I ran pip install update findpython==0.1.4 and it’s fixed.