getsource

inspect

function (source)

getsource(object)

Return the text of the source code for an object.

The argument may be a module, class, method, function, traceback, frame,
or code object.  The source code is returned as a single string.  An
OSError is raised if the source code cannot be retrieved.

© Python Software Foundation. PSF License Version 2 · Official docs ↗

Changed in 3.3

3.3: OSError is raised instead of IOError, now an alias of the former.