"""

An example module

:author: Daniel Abercrombie <dabercro@mit.edu>

"""

def example_function(an_integer, a_string, int_or_str):

"""My example function for the developer guidelines.

:param int an_integer: This is a description for what an integer can be used for

:param str a_string: This is a description for what a string can be used for

:param int_or_str: This is just an example for more complex variables types

:type int_or_str: int or str

:returns: The number 0

:rtype: int

:raises TypeError: If any of the variables are the wrong type

"""

if not (isinstance(an_integer, int) and isinstance(a_string, str)

and (isinstance(int_or_str, int) or isinstance(int_or_str, str))):

raise TypeError('At least one of the input variables is the wrong type.')

return 0