How to Import a Module That Is Definitely Installed

Unable to import a module that is definitely installed

In my case, it is permission problem. The package was somehow installed with root rw permission only, other user just cannot rw to it!

Cannot import module after installed by pip

Python looks for its modules and packages in $PYTHONPATH. You'll need to figure out if the __init__.py module of the package you'd like to use is in python's path. To find out whether it is in python's path, run:

    import sys
    print(sys.path)

within python.

To add the path to your module, run:

sys.path.append("/path/to/your/package_or_module")

and you should be set.

Why do I have to install all python modules again for every new project? (Pycharm)

You can select project interpreter.

Go to Settings → Python Interpreter. Select your environment. If you are creating a new project, use base environment instead of creating a "virtual environment".

Edit
As @juanpa.arrivillaga pointed out, this may not be the preferred way. If you are installing dependencies, make sure you have a new conda environment (rather than using base environment) dedicated to that project. So that, if things go south, you can delete that environment and create new one.

Getting an error for a module that I definitely imported

The ModuleError says that you do not have pysimplevalidate installed.

Using the same python executable as you are using to run your script (idiot.py), run

python -m pip install pysimplevalidate

or, even more bullet-proof:

<path_to_python.exe> -m pip install pysimplevalidate

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If you are not sure what python executable the script is using, you can check it with

# put this on top of your script
import sys
print(sys.executable) # will print C:\path\to\python.exe

Can't import my own modules in Python

In your particular case it looks like you're trying to import SomeObject from the myapp.py and TestCase.py scripts. From myapp.py, do

import SomeObject

since it is in the same folder. For TestCase.py, do

from ..myapp import SomeObject

However, this will work only if you are importing TestCase from the package. If you want to directly run python TestCase.py, you would have to mess with your path. This can be done within Python:

import sys
sys.path.append("..")
from myapp import SomeObject

though that is generally not recommended.

In general, if you want other people to use your Python package, you should use distutils to create a setup script. That way, anyone can install your package easily using a command like python setup.py install and it will be available everywhere on their machine. If you're serious about the package, you could even add it to the Python Package Index, PyPI.

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