有很多解决方案，有些比其他的更方便，但它们并不总是有效。

以下是你可以尝试的，从“快速”到“烦人”:

Do File -> Invalidate Caches / Restart and restart PyCharm. You could also do this after any of the below methods, just to be sure. First, check which interpreter you're running: Run -> Edit Configurations -> Configuration -> Python Interpreter. Refresh the paths of your interpreter: File -> Settings Project: [name] -> Project Interpreter -> 'Project Interpreter': Gear icon -> More... Click the 'Show paths' button (bottom one) Click the 'Refresh' button (bottom one) Remove the interpreter and add it again: File -> Settings Project: [name] -> Project Interpreter -> 'Project Interpreter': Gear icon -> More... Click the 'Remove' button Click the 'Add' button and re-add your interpeter Delete your project preferences Delete your project's .idea folder Close and re-open PyCharm Open your project from scratch Delete your PyCharm user preferences (but back them up first). ~/.PyCharm50 on Mac %homepath%/.PyCharm50 on Windows Switch to another interpreter, then back again to the one you want. Create a new virtual environment, and switch to that environments' interpreter. Create a new virtual environment in a new location -- outside of your project folder -- and switch to that environment's interpreter. Switch to another interpreter altogether; don't switch back.

如果你正在使用Docker，请注意:

确保您使用的是pip3而不是pip，特别是远程docker和docker-compose解释器。 避免影响PYTHONPATH。更多信息请访问:https://intellij-support.jetbrains.com/hc/en-us/community/posts/115000058690-Module-not-found-in-PyCharm-but-externally-in-Python。

如果上面的方法对你不起作用，但你发现了另一个技巧，那么请留下评论。

有很多解决方案，有些比其他的更方便，但它们并不总是有效。

以下是你可以尝试的，从“快速”到“烦人”:

Do File -> Invalidate Caches / Restart and restart PyCharm. You could also do this after any of the below methods, just to be sure. First, check which interpreter you're running: Run -> Edit Configurations -> Configuration -> Python Interpreter. Refresh the paths of your interpreter: File -> Settings Project: [name] -> Project Interpreter -> 'Project Interpreter': Gear icon -> More... Click the 'Show paths' button (bottom one) Click the 'Refresh' button (bottom one) Remove the interpreter and add it again: File -> Settings Project: [name] -> Project Interpreter -> 'Project Interpreter': Gear icon -> More... Click the 'Remove' button Click the 'Add' button and re-add your interpeter Delete your project preferences Delete your project's .idea folder Close and re-open PyCharm Open your project from scratch Delete your PyCharm user preferences (but back them up first). ~/.PyCharm50 on Mac %homepath%/.PyCharm50 on Windows Switch to another interpreter, then back again to the one you want. Create a new virtual environment, and switch to that environments' interpreter. Create a new virtual environment in a new location -- outside of your project folder -- and switch to that environment's interpreter. Switch to another interpreter altogether; don't switch back.

如果你正在使用Docker，请注意:

确保您使用的是pip3而不是pip，特别是远程docker和docker-compose解释器。 避免影响PYTHONPATH。更多信息请访问:https://intellij-support.jetbrains.com/hc/en-us/community/posts/115000058690-Module-not-found-in-PyCharm-but-externally-in-Python。

如果上面的方法对你不起作用，但你发现了另一个技巧，那么请留下评论。

如果你只想忽略一些“未解决的引用”错误，你也可以通过在你的类/方法/函数前显式地告诉它PyCharm:

# noinspection PyUnresolvedReferences

其他答案所建议的无效缓存对我不起作用。在我的案例中，我发现的问题是PyCharm将Python包的init.py文件标记为文本，因此没有将它们包括在分析中，这意味着Python解析无法正确工作。

我的解决方案是:

打开PyCharm设置 导航到编辑器->文件类型 找到Python并将__init__.py添加到Python文件列表中 或查找文本并从文本文件列表中删除__init__.py

我也有同样的症状在我的例子中，问题的来源是我设置的 自定义属性中的Idea.max.intellisense.filesize =50。 我可以把它设为100。

帮助->编辑自定义属性

你在使用virtualenv吗?

如果是这样，你需要通知PyCharm所需的python.exe位置的每一次更改(仅./activate对PyCharm来说是不够的)。

确保Pycharm指向正确的解释器和包: 文件->设置->项目->项目解释器。单击齿轮并在virtualenv的脚本文件夹下选择python.exe