python nonetype code example

Example 1: python 2.7 check if variable is none

>>> NoneType = type(None)
>>> x = None
>>> type(x) == NoneType
True
>>> isinstance(x, NoneType)
True

Example 2: test if object is NoneType python

if variable is None:

Example 3: join() python

# example of join() function in python

numList = ['1', '2', '3', '4']
separator = ', '
print(separator.join(numList))