permutation and combination code in python
# A Python program to print all  
# combinations of a given length  
from itertools import combinations  
  
# Get all combinations of [1, 2, 3]  
# and length 2  
comb = combinations([1, 2, 3], 2)  
  
# Print the obtained combinations  
for i in list(comb):  
    print (i)