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python - 安装密码学时 pip._vendor.pep517.wrappers.BackendUnavailable 错误

问题描述

我正在尝试将密码术安装到我的系统中，但出现此错误：

  WARNING: Missing build requirements in pyproject.toml for cryptography from https://files.pythonhosted.org/packages/07/ca/bc827c5e55918ad223d59d299fff92f3563476c3b00d0a9157d9c0217449/cryptography-2.6.1.tar.gz#sha256=26c821cbeb683facb966045e2064303029d572a87ee69ca5a1bf54bf55f93ca6.
  WARNING: The project does not specify a build backend, and pip cannot fall back to setuptools without 'setuptools>=40.8.0' and 'wheel'.
  Getting requirements to build wheel ... done
ERROR: Exception:
Traceback (most recent call last):
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/cli/base_command.py", line 178, in main
    status = self.run(options, args)
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/commands/install.py", line 352, in run
    resolver.resolve(requirement_set)
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/resolve.py", line 131, in resolve
    self._resolve_one(requirement_set, req)
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/resolve.py", line 294, in _resolve_one
    abstract_dist = self._get_abstract_dist_for(req_to_install)
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/resolve.py", line 242, in _get_abstract_dist_for
    self.require_hashes
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 368, in prepare_linked_requirement
    abstract_dist.prep_for_dist(finder, self.build_isolation)
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 175, in prep_for_dist
    self.install_backend_dependencies(finder=finder)
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_internal/operations/prepare.py", line 123, in install_backend_dependencies
    reqs = req.pep517_backend.get_requires_for_build_wheel()
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/wrappers.py", line 71, in get_requires_for_build_wheel
    'config_settings': config_settings
  File "/data/packages/usr/local/lib/python3.6/site-packages/pip/_vendor/pep517/wrappers.py", line 162, in _call_hook
    raise BackendUnavailable
pip._vendor.pep517.wrappers.BackendUnavailable

这是我的设置：

知道可能是什么问题，或者如何解决它？我在这里先向您的帮助表示感谢！

标签： pythonpipcryptography

解决方案

我在使用不同的库时遇到了同样的错误，--no-use-pep517但没有帮助。然而，这样做：

python -m pip install --upgrade pip

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