Converting binary to decimal integer output

Question

I need to convert a binary input into a decimal integer. I know how to go from a decimal to a binary:

n = int(raw_input(\'enter a number: \'))
print \'{0:b}\'.fo         


        

Answer 1

a = input('Enter a binary number : ')
ar = [int(i) for  i in a]
ar  = ar[::-1]
res = []
for i in range(len(ar)):
    res.append(ar[i]*(2**i))
sum_res = sum(res)      
print('Decimal Number is : ',sum_res)