How Can I Retrieve the Source Code of a Python Function?

Retrieving Python Function Source Code

In Python, determining the name of a function is straightforward using func_name. However, obtaining its source code can be a bit trickier.

Source Code Retrieval

If the function resides in a source file on the filesystem, inspect.getsource() provides an effective solution. This function accepts the function as an argument and retrieves its source code as a string.

For instance, consider the following function:

def foo(arg1, arg2):
    # do something with args
    a = arg1 + arg2
    return a

To retrieve its source code using inspect.getsource(), one could execute the following:

import inspect
lines = inspect.getsource(foo)
print(lines)

This will output the source code as expected:

def foo(arg1, arg2):
    # do something with args
    a = arg1 + arg2
    return a

Limitations

It's important to note that inspect.getsource() has limitations. If the function is compiled from a string or stream, or imported from a compiled file, retrieving its source code is not possible.

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