#### Binary and Operator

D
V
```# https://www.tutorialspoint.com/python3/bitwise_operators_example.htm

def binary_and(a: int, b: int) -> str:
"""
Take in 2 integers, convert them to binary,
return a binary number that is the
result of a binary and operation on the integers provided.

>>> binary_and(25, 32)
'0b000000'
>>> binary_and(37, 50)
'0b100000'
>>> binary_and(21, 30)
'0b10100'
>>> binary_and(58, 73)
'0b0001000'
>>> binary_and(0, 255)
'0b00000000'
>>> binary_and(256, 256)
'0b100000000'
>>> binary_and(0, -1)
Traceback (most recent call last):
...
ValueError: the value of both inputs must be positive
>>> binary_and(0, 1.1)
Traceback (most recent call last):
...
TypeError: 'float' object cannot be interpreted as an integer
>>> binary_and("0", "1")
Traceback (most recent call last):
...
TypeError: '<' not supported between instances of 'str' and 'int'
"""
if a < 0 or b < 0:
raise ValueError("the value of both inputs must be positive")

a_binary = str(bin(a))[2:]  # remove the leading "0b"
b_binary = str(bin(b))[2:]  # remove the leading "0b"

max_len = max(len(a_binary), len(b_binary))

return "0b" + "".join(
str(int(char_a == "1" and char_b == "1"))
for char_a, char_b in zip(a_binary.zfill(max_len), b_binary.zfill(max_len))
)

if __name__ == "__main__":
import doctest

doctest.testmod()
```