if not statement in python code example

Example 1: python if not true

a = False
if not a:
  #Does this

a = True
if not a:
  #Doesn't do this

Example 2: if not python

a = False
if not a:
    yourFunction()

Example 3: not staments python

thingie == 1
while not (thingie == 0):
  //do somthing