how to using if not in pyhton code example

Example 1: python if not

# Using "if not" is practically saying that, 'if this condition is false......'
a = False
if not a:
  print("a is False")
  
# IS SAME AS:

if a == False:
  print("a is False")

Example 2: if not python

a = False
if not a:
    yourFunction()