Assertion Error: assert not (home and prefix)

[weilueluo]

Environment

• pip version: 20.1.1
• Python version: 3.8.3
• OS: Windows 10

PIP_CACHE_DIR = D:\Environments\Python\pip cache dir
PIP_TARGET = D:\Environments\Python\Lib\site-packages

Description

A weird error when I tried to install pyinstaller

Expected behavior
install normally

How to Reproduce

pip install pyinstaller

Output

Collecting pyinstaller
  Using cached PyInstaller-3.6.tar.gz (3.5 MB)
  Installing build dependencies ... error
  ERROR: Command errored out with exit status 2:
   command: 'd:\environments\python\python.exe' 'd:\environments\python\lib\site-packages\pip' install --ignore-installed --no-user --prefix 'D:\Environments\TEMP\pip-build-env-siqaoa6a\overlay' --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.8.0' wheel
       cwd: None
  Complete output (22 lines):
  Collecting setuptools>=40.8.0
    Using cached setuptools-47.1.1-py3-none-any.whl (583 kB)
  Collecting wheel
    Using cached wheel-0.34.2-py2.py3-none-any.whl (26 kB)
  Installing collected packages: setuptools, wheel
  ERROR: Exception:
  Traceback (most recent call last):
    File "d:\environments\python\lib\site-packages\pip\_internal\cli\base_command.py", line 188, in _main
      status = self.run(options, args)
    File "d:\environments\python\lib\site-packages\pip\_internal\cli\req_command.py", line 185, in wrapper
      return func(self, options, args)
    File "d:\environments\python\lib\site-packages\pip\_internal\commands\install.py", line 398, in run
      installed = install_given_reqs(
    File "d:\environments\python\lib\site-packages\pip\_internal\req\__init__.py", line 67, in install_given_reqs
      requirement.install(
    File "d:\environments\python\lib\site-packages\pip\_internal\req\req_install.py", line 769, in install
      scheme = get_scheme(
    File "d:\environments\python\lib\site-packages\pip\_internal\locations.py", line 185, in get_scheme
      scheme = distutils_scheme(
    File "d:\environments\python\lib\site-packages\pip\_internal\locations.py", line 118, in distutils_scheme
      assert not (home and prefix), "home={} prefix={}".format(home, prefix)
  AssertionError: home=D:\Environments\TEMP\pip-target-wydanjze prefix=D:\Environments\TEMP\pip-build-env-siqaoa6a\overlay
  ----------------------------------------
ERROR: Command errored out with exit status 2: 'd:\environments\python\python.exe' 'd:\environments\python\lib\site-packages\pip' install --ignore-installed --no-user --prefix 'D:\Environments\TEMP\pip-build-env-siqaoa6a\overlay' --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.8.0' wheel Check the logs for full command output.

[weilueluo]

It seems like PIP_TARGET and --prefix cannot be used together, but I do not know how to fix that, I want to install it to my PIP_TARGET directory.

[McSinyx]

Hi @Redcxx, I think that you're correct that target and prefix don't go together (I'm having GH-7828 with better error for it). Though, I wonder where you specified prefix since I couldn't see it in your command.

[weilueluo]

Hi @McSinyx, I did not use --prefix. I do not understand why this error happens as well. It installs successfully if I remove the PIP_TARGET environment variables. I also have other environment variables set, not sure if they are related:

TEMP=D:\Environments\TEMP
TMP=D:\Environments\TEMP
TMPDIR=D:\Environments\TEMP

[x-yuri]

@McSinyx The --prefix is set by pip here:

https://github.com/pypa/pip/blob/20.2.2/src/pip/_internal/build_env.py#L176

The --home is taken from PIP_TARGET:

https://github.com/pypa/pip/blob/20.2.2/src/pip/_internal/configuration.py#L330-L332
https://github.com/pypa/pip/blob/20.2.2/src/pip/_internal/cli/parser.py#L243
https://github.com/pypa/pip/blob/20.2.2/src/pip/_internal/commands/install.py#L417

It affects source (not wheel, supposedly) distribution packages. E.g.

$ pip --version
pip 20.2.2 from /app/site-packages/pip (python 3.5)

$ python --version
Python 3.5.9

$ pip install cryptography==3.0
Collecting cryptography==3.0
  Using cached cryptography-3.0.tar.gz (534 kB)
  Installing build dependencies ... error
  ERROR: Command errored out with exit status 2:
   command: /usr/local/bin/python /app/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-jhlf49yq/overlay --no-warn-script
-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.8,!=1.11.3; platform_python_implementat
ion != '"'"'PyPy'"'"''
       cwd: None
  Complete output (25 lines):
  Collecting setuptools>=40.6.0
    Using cached setuptools-49.6.0-py3-none-any.whl (803 kB)
  Collecting wheel
    Using cached wheel-0.35.1-py2.py3-none-any.whl (33 kB)
  Processing /home/app/.cache/pip/wheels/5f/f6/1a/7f35bef3818f2db90a09af3014a8fab328f0d4481aab8f039d/cffi-1.14.1-cp35-cp35m-linux_x86_64.whl
  Collecting pycparser
    Using cached pycparser-2.20-py2.py3-none-any.whl (112 kB)
  Installing collected packages: setuptools, wheel, pycparser, cffi
  ERROR: Exception:
  Traceback (most recent call last):
    File "/app/site-packages/pip/_internal/cli/base_command.py", line 220, in _main
      status = self.run(options, args)
    File "/app/site-packages/pip/_internal/cli/req_command.py", line 182, in wrapper
      return func(self, options, args)
    File "/app/site-packages/pip/_internal/commands/install.py", line 423, in run
      pycompile=options.compile,
    File "/app/site-packages/pip/_internal/req/__init__.py", line 90, in install_given_reqs
      pycompile=pycompile,
    File "/app/site-packages/pip/_internal/req/req_install.py", line 784, in install
      prefix=prefix,
    File "/app/site-packages/pip/_internal/locations.py", line 188, in get_scheme
      dist_name, user, home, root, isolated, prefix
    File "/app/site-packages/pip/_internal/locations.py", line 120, in distutils_scheme
      assert not (home and prefix), "home={} prefix={}".format(home, prefix)
  AssertionError: home=/tmp/pip-target-qt1_22bd prefix=/tmp/pip-build-env-jhlf49yq/overlay
  ----------------------------------------
ERROR: Command errored out with exit status 2: /usr/local/bin/python /app/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-en
v-jhlf49yq/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- 'setuptools>=40.6.0' wheel 'cffi>=1.8,!=
1.11.3; platform_python_implementation != '"'"'PyPy'"'"'' Check the logs for full command output.

pip install pycrypto==2.6.1 succeeds.

[x-yuri]

But it works if --target is specified via command line (since this way PIP_TARGET doesn't get propagated to the subprocess):

$ pip install --target site-packages cryptography==3.0

The closest alternatives are --prefix (PIP_PREFIX), and --root (doesn't work with an environment variable either).

P.S. Make sure to set PYTHONPATH=site-packages or something to be able to import the packages.

[harish-ganesh]

I'm getting a similar error too:
pip install pyEDFlib

ERROR: Command errored out with exit status 2:
   command: /home/spark/conda/envs/python3.6/bin/python /opt/ibm/conda/miniconda/lib/python/site-packages/pip install --ignore-installed --no-user --prefix /tmp/pip-build-env-pjqsm6zk/overlay --no-warn-script-location --no-binary :none: --only-binary :none: -i https://pypi.org/simple -- setuptools wheel 'numpy >= 1.9.1' cython
       cwd: None
  Complete output (29 lines):
  Collecting setuptools
    Using cached setuptools-50.3.2-py3-none-any.whl (785 kB)
  Collecting wheel
    Using cached wheel-0.35.1-py2.py3-none-any.whl (33 kB)
  Collecting numpy>=1.9.1
    Using cached numpy-1.19.2-cp36-cp36m-manylinux2010_x86_64.whl (14.5 MB)
  Collecting cython
    Using cached Cython-0.29.21-cp36-cp36m-manylinux1_x86_64.whl (2.0 MB)
  Installing collected packages: setuptools, wheel, numpy, cython
  ERROR: Exception:
AssertionError: home=/tmp/pip-target-o5x9q9xw prefix=/tmp/pip-build-env-pjqsm6zk/overlay

[bcesaralves]

I had a similar issue and solved it with the sudo's -H flag:
sudo -H pip install pyinstaller

[reox]

I had this problem now too while installing a local package like this: python3 -m pip install -U .
I have the PIP_TARGET variable set, which seems to be the culprit. However, I was able to workaround this, by building a wheel first and then installing the wheel:

python3 setup.py bdist_wheel
python3 -m pip install -U dist/mypackage*.whl

pip 21.2.4 / python 3.9.7
I also tested with 22.0.4 but the only difference is the new shiny error message (they look really good! But do not solve the issue 😅)

[yannbouteiller]

I started having the same error on a raspberry pi and whatever I do doesn't seem to resolve the issue. I have tried uninstalling pip3 and python3, then reinstalling python3-pip with apt, which doesn't solve the issue. Where does this come from please?

[uranusjr]

If you install pip from apt, this likely needs to be reported to apt, since the pip they distribute is configured differently.

[yannbouteiller]

Answer 5 here corrected it for me.

Some app had apparently added

[global]
target=/foo/bar

in ~/.config/pip/pip.conf

[PApostol]

I was getting a similar error with pip 22.3 & Python 3.7.3 on Windows 10: ERROR: Cannot set --home and --prefix together.

The work around was to remove target from the global field in file C:\Users\<USER>\AppData\Roaming\pip\pip.ini and provide the target as a CLI argument to pip install: --target path\to\site-packages.