Often we want to know how a function is written in an imported package. This post explains how to examine the source code of a function/class.
To know where the package is installed:
For the package pandas:
import pandas pandas.__file__
To examine the source code of a given function or class, import the package inspect.
import inspect as insp print insp.getsourcefile(pandas.DataFrame) # prints the path to source file print insp.getsourcelines(pandas.DataFrame) # prints the source code
inspect package can be found here.
Viewing the source code from IPython Notebook
? to the function name inside the ipython-notebook cell to view code description and
?? for the entire source code.
import pandas pandas.DataFrame? # shows the docstring pandas.DataFrame?? # shows the source code and docstring