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"""Default Argument Values

@see: https://docs.python.org/3/tutorial/controlflow.html#default-argument-values

The most useful form is to specify a default value for one or more arguments. This creates a

function that can be called with fewer arguments than it is defined to allow.

"""

def power_of(number, power=2):

""" Raises number to specific power.

You may notice that by default the function raises number to the power of two.

"""

return number ** power

def test_default_function_arguments():

"""Test default function arguments"""

# This function power_of can be called in several ways because it has default value for

# the second argument. First we may call it omitting the second argument at all.

assert power_of(3) == 9

# We may also want to override the second argument by using the following function calls.

assert power_of(3, 2) == 9

assert power_of(3, 3) == 27