sorin sorin - 3 months ago 7
Python Question

How to install a missing python package from inside the script that needs it?

Assuming that you already have pip or easy_install installed on your python distribution, I would like to know how can I installed a required package in the user directory from within the script itself.

From what I know pip is also a python module so the solution should look like:

try:
import zumba
except ImportError:
import pip
# ... do "pip install --user zumba" or throw exception <-- how?
import zumba


What I am missing is doing "pip install --user zumba" from inside python, I don't want to do it using
os.system()
as this may create other problems.

I assume it is possible...

Answer

Thanks to @Joop I was able to come-up with the proper answer.

try:
    import zumba
except ImportError:
    import pip
    pip.main(['install', '--user', 'zumba'])
    import zumba

One important remark is that this will work without requiring root access as it will install the module in user directory.

Not sure if it will work for binary modules or ones that would require compilation, but it clearly works well for pure-python modules.

Now you can write self contained scripts and not worry about dependencies.

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