python - PyCharm: ImportError no module named X?

Question

X in this example represents any module or package you install.

The problem:

I have a problem with a package called 'X'. In PyCharm I get an error ImportError: No module named 'X'. My code runs from the terminal without any problem. Any help ?

or

I installed X on python3.4 with pip. In terminal, when I import X, everything is fine, but when I import it in PyCharm, it says: ImportError: No module named 'X'". Any help ?

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This is basically everyday question, just with different module or a package instead name instead of X.

And it's not problem in a package or module you install, it's in a PyCharm Project Interpreter you are currently using for your project.

The following answer is usually solution to this specific problem.

Answer 1

SHORTER VERSION:

If you have squiggly line below module you import...

...move on name of module and press Alt+Enter and select Install package X.

This should (probably !!!) install module you thought you installed, but got ImportError.

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LONGER:

If you want to use module X:

Go to File -> Settings -> Project:NameOfProject -> Project Interpreter.

The window that opens has some specific regions:

1. This is a project interpreter PyCharm is currently using. You can change you python environments here also. If you want to add virtual environment you created manually, continue reading.
2. A little "cog" or a "gear" is used to Add, Edit or Remove environments. If you want to add virtual environment you created manually, select Add... when gear icon is clicked, and make sure to set proper path to python.exeof your virtual environment.
3. IMPORTANT: A list of all installed packages, represented by: Package name and Version. If you tried to use package, but got ImportError no module named 'X', make sure to check if package is listed here!!!. If not, it's not installed in the current python environment and it should be installed (continue reading).

4. A little + represents Install. It can be used to install packages. Simply click on + sign, search for a package and click Install Package at the bottom after you found it. You can also specify the version you want of a package. In example below, we searched for flask package.

   A package should be installed and listed now in installed packages.