Question

我安装了Python 3.9，创建了venv并尝试安装numpy。 Cython出现错误，已在后备箱中修复。

因此，我在venv Cython 3.0a0中安装并重试：

（venv）marco @ buzz：〜/ sources / cython $ pip install numpy --no-cache-dir

[...]

收集Cython> = 0.29.13

[...]

错误：命令错误，退出状态为1：   /home/marco/sources/tests/more_itertools/venv/bin/python3.9   /home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip   安装 -忽略安装 --no-user --prefix   / tmp / pip-build-env-3ctn3kl8 / overlay --no-warn-script-location   --no-binary：none：--only-binary：none：-i https://pypi.org/simple-setuptools wheel'Cython> = 0.29.13'检查日志以获取完整命令   输出。

因此，我尝试在功能--ignore-installed中的venv/lib/python3.9/site-packages/pip/_internal/build_env.py中注释掉def install_requirements。我收到此错误：

ERROR: Exception:
Traceback (most recent call last):
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/cli/base_command.py", line 153, in _main
    status = self.run(options, args)
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/commands/install.py", line 382, in run
    resolver.resolve(requirement_set)
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/legacy_resolve.py", line 201, in resolve
    self._resolve_one(requirement_set, req)
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/legacy_resolve.py", line 365, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/legacy_resolve.py", line 312, in _get_abstract_dist_for
    abstract_dist = self.preparer.prepare_linked_requirement(
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/operations/prepare.py", line 223, in prepare_linked_requirement
    abstract_dist = _get_prepared_distribution(
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/operations/prepare.py", line 49, in _get_prepared_distribution
    abstract_dist.prepare_distribution_metadata(finder, build_isolation)
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/distributions/source/legacy.py", line 37, in prepare_distribution_metadata
    self._setup_isolation(finder)
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_internal/distributions/source/legacy.py", line 90, in _setup_isolation
    reqs = backend.get_requires_for_build_wheel()
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_vendor/pep517/wrappers.py", line 151, in get_requires_for_build_wheel
    return self._call_hook('get_requires_for_build_wheel', {
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_vendor/pep517/wrappers.py", line 255, in _call_hook
    raise BackendUnavailable(data.get('traceback', ''))
pip._vendor.pep517.wrappers.BackendUnavailable: Traceback (most recent call last):
  File "/home/marco/sources/tests/more_itertools/venv/lib/python3.9/site-packages/pip/_vendor/pep517/_in_process.py", line 63, in _build_backend
    obj = import_module(mod_path)
  File "/usr/local/lib/python3.9/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1016, in _gcd_import
  File "<frozen importlib._bootstrap>", line 993, in _find_and_load
  File "<frozen importlib._bootstrap>", line 963, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 219, in _call_with_frames_removed
  File "<frozen importlib._bootstrap>", line 1016, in _gcd_import
  File "<frozen importlib._bootstrap>", line 993, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
ModuleNotFoundError: No module named 'setuptools'

所以我手动安装了依赖项，并尝试使用--no-deps：

(venv) marco@buzz:~/sources/tests/more_itertools/venv$ pip install numpy --no-deps
Collecting numpy
  Using cached https://files.pythonhosted.org/packages/31/0a/5df350c29a06835d534a6c4f5681075304da38d85f1c69e5226a635a67ce/numpy-1.18.0.zip
  Installing build dependencies ... error
[...]

，错误与以前相同。 --no-deps被忽略，--ignore-installed强制从Pypi下载Cython，这不适用于Python 3.9。

显然，没有--no-ignore-installed或--ignore-installed=0。以及

pip忽略--no-deps
如果您在--ignore-installed中注释掉venv，则pip找不到已安装的模块

Answer 1

我在旧的easy_install上取得了成功，所以我认为现在很好。我会将此错误报告给venv开发人员。

无法使用Python 3.9 venv`pip install numpy`

1 个答案: