In [46]:

    

a= 1
b =2
a,b = b,a


    

In [38]:

    

def factorial_(n):
    count = 1
    for elem in range(1,n +1):
        count *= elem

    return count


    

In [ ]:

    




    

In [40]:

    

factorial_(4)


    

    
Out[40]:





24

In [42]:

    

for i in range(1,20):
    print(factorial_(i))


    

    




1
2
6
24
120
720
5040
40320
362880
3628800
39916800
479001600
6227020800
87178291200
1307674368000
20922789888000
355687428096000
6402373705728000
121645100408832000

In [48]:

    

bin(21)


    

    
Out[48]:





'0b10101'

In [ ]: