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# 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):

...

ValueError: Unknown format code 'b' for object of type 'float'

>>> 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 = format(a, "b")

b_binary = format(b, "b")

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()

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