why : is used in for if python code example

Example 1: python if

if num<5:
  print('Num less than 5')
elif 5<= num <=9:
  print('Num between 5 and 9')
else:
  print('Num more than 9')

Example 2: how to do if= python

#if you are doing this
if X=1
#Do this
if X==1