问如何缩短python中二进制到十进制转换器的列表？

EN

conversion = input("Enter an 8 bit  binary number to convert: ")

conversion = list(conversion)

ok = False;

if conversion[0] == '0':
    ok = True

if conversion[0] == '1':
    ok = True

if conversion[1] == '0':
    ok = True

if conversion[1] == '1':
    ok = True

if conversion[2] == '0':
    ok = True

if conversion[2] == '1':
    ok = True

if conversion[3] == '0':
    ok = True

if conversion[3] == '1':
    ok = True

if conversion[4] == '0':
    ok = True

if conversion[4] == '1':
    ok = True

if conversion[5] == '0':
    ok = True

if conversion[5] == '1':
    ok = True

if conversion[6] == '0':
    ok = True

if conversion[6] == '1':
    ok = True

if conversion[7] == '0':
    ok = True

if conversion[7] == '1':
    ok = True

if ok == True:
    print("Number is binary!")


n1 = 0

if conversion[7] == '1':
    n1 = 1

if conversion[6] == '1':
    n1 = n1 + 2

if conversion[5] == '1':
    n1 = n1 + 4

if conversion[4] == '1':
    n1 = n1 + 8

if conversion[3] == '1':
    n1 = n1 + 16

if conversion[2] == '1':
    n1 = n1 + 32

if conversion[1] == '1':
    n1 = n1 + 64

if conversion[0] == '1':
    n1 = n1 + 128