add without plus

2021-10-24.py

def binOr(x, y):
    if x == '0' and y == '0':
        return 0
    elif x == '1' and y == '1':
        return 2
    else:
        return 1
a = 10
b = 20    
bin_a = str(str(bin(a))[2::])[::-1]
bin_b = str(str(bin(b))[2::])[::-1]
l = len(bin_a) if len(bin_a) > len(bin_b) else len(bin_b)

z = []
for i in range(l):
    try:
        c = bin_a[i]
    except:
        c = 0
    try:
        d = bin_b[i]
    except:
        d = 0
    z.insert(0,(str(binOr(c, d))))
print(str(int(''.join(z),2)))