Python 3.8 pytest-qt ModuleNotFoundError：沒有名為“PyQt4”的模塊

Question

我已經在安裝了 python 3.6 的 Linux mint 19 上創建了我的項目。 我將pytest與pytest-qt結合使用來測試我的應用程序，它是一個 PyQt5 程序。

然后，我已經更新到 Linux mint 20。但是 python 3.8 安裝在那里而不是 3.6。 我不知道它是否相關，但現在我無法再運行我的測試套件，當我在終端中輸入pytest ，它給了我以下輸出：

Traceback (most recent call last):
  File "/home/kotlin/.local/bin/pytest", line 8, in <module>
    sys.exit(console_main())
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/config/__init__.py", line 187, in console_main
    code = main()
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/config/__init__.py", line 143, in main
    config = _prepareconfig(args, plugins)
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/config/__init__.py", line 318, in _prepareconfig
    config = pluginmanager.hook.pytest_cmdline_parse(
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/hooks.py", line 286, in __call__
    return self._hookexec(self, self.get_hookimpls(), kwargs)
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/manager.py", line 93, in _hookexec
    return self._inner_hookexec(hook, methods, kwargs)
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/manager.py", line 84, in <lambda>
    self._inner_hookexec = lambda hook, methods, kwargs: hook.multicall(
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/callers.py", line 203, in _multicall
    gen.send(outcome)
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/helpconfig.py", line 100, in pytest_cmdline_parse
    config = outcome.get_result()  # type: Config
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/callers.py", line 80, in get_result
    raise ex[1].with_traceback(ex[2])
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/callers.py", line 187, in _multicall
    res = hook_impl.function(*args)
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/config/__init__.py", line 1003, in pytest_cmdline_parse
    self.parse(args)
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/config/__init__.py", line 1280, in parse
    self._preparse(args, addopts=addopts)
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/config/__init__.py", line 1172, in _preparse
    self.pluginmanager.load_setuptools_entrypoints("pytest11")
  File "/home/kotlin/.local/lib/python3.8/site-packages/pluggy/manager.py", line 299, in load_setuptools_entrypoints
    plugin = ep.load()
  File "/usr/lib/python3.8/importlib/metadata.py", line 77, in load
    module = import_module(match.group('module'))
  File "/usr/lib/python3.8/importlib/__init__.py", line 127, in import_module
    return _bootstrap._gcd_import(name[level:], package, level)
  File "<frozen importlib._bootstrap>", line 1014, in _gcd_import
  File "<frozen importlib._bootstrap>", line 991, in _find_and_load
  File "<frozen importlib._bootstrap>", line 975, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 671, in _load_unlocked
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/assertion/rewrite.py", line 171, in exec_module
    exec(co, module.__dict__)
  File "/home/kotlin/.local/lib/python3.8/site-packages/pytestqt/plugin.py", line 7, in <module>
    from pytestqt.qt_compat import QtCore, QtGui, QtTest
  File "/home/kotlin/.local/lib/python3.8/site-packages/_pytest/assertion/rewrite.py", line 171, in exec_module
    exec(co, module.__dict__)
  File "/home/kotlin/.local/lib/python3.8/site-packages/pytestqt/qt_compat.py", line 31, in <module>
    import PyQt4.QtCore as _QtCore
ModuleNotFoundError: No module named 'PyQt4'

最后它說ModuleNotFoundError: No module named 'PyQt4'但我什至不使用 PyQt4，而是使用 PyQt5。

我已經安裝了pytest和pytest-qt 。 程序本身運行正常。

謝謝。

Answer 1

這部分錯誤信息：

  File "/home/kotlin/.local/lib/python3.8/site-packages/pytestqt/qt_compat.py", line 31, in <module>
    import PyQt4.QtCore as _QtCore
ModuleNotFoundError: No module named 'PyQt4'

提示問題 - 使用的qt-pytest版本仍然引用PyQt4 ，而當前版本在一段時間前刪除了這些引用 - 這意味着安裝的python-qt版本已過時。 可以使用更新版本

pip3 install -U pytest-qt

如評論中所述。 目前尚不清楚為什么首先安裝舊版本 - 一種可能性是舊版本已經由其他軟件包安裝，在這種情況下通過pip （沒有update選項）安裝它不會做任何事情。