write python3 to calc file unsigned crc32

Here is a Python3 code to calculate an unsigned CRC32 value for a file:

import binascii

def calculate_crc32(filename):
    crc = 0xFFFFFFFF
    with open(filename, "rb") as f:
        data = f.read()
        crc = binascii.crc32(data, crc) & 0xFFFFFFFF
    return crc

To use this function, simply pass the filename of the file you want to calculate the CRC32 value for:

filename = "example.txt"
crc32 = calculate_crc32(filename)
print(hex(crc32)) # prints the CRC32 value in hexadecimal format

Note that the binascii.crc32 function returns a signed 32-bit integer, so we need to use a bitwise AND operation with 0xFFFFFFFF to get an unsigned value