python代码：

hashlib库版：

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import hashlib

def md5_hash(message):
    # 创建md5对象
    md5 = hashlib.md5()

    # 使用md5对象进行哈希计算
    md5.update(message.encode('utf-8'))

    # 获取哈希值
    return md5.hexdigest()


if __name__ == '__main__':
    message = "Hello, world!"
    print(message + ' 的MD5值')
    print(md5_hash(message))  # 输出消息的MD5值
    print()
    message1 = '1234567890abc'
    print(message1 + ' 的MD5值')
    print(md5_hash(message1))  # 输出消息的MD5值

实验结果

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Hello, world! 的MD5值
6cd3556deb0da54bca060b4c39479839

1234567890abc 的MD5值
43287ae11fca6e336459a32845e41b24

Process finished with exit code 0

不调库的：

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import struct

def left_rotate(x, c):
    return (x << c) | (x >> (32 - c))

def md5(message):
    message = bytearray(message)  # copy our input into a mutable buffer
    orig_len_in_bits = (8 * len(message)) & 0xffffffffffffffff
    message.append(0x80)
    while len(message) % 64 != 56:
        message.append(0)
    message += struct.pack('<Q', orig_len_in_bits)

    # initialize hash value for this chunk
    a, b, c, d = (0x67452301, 0xefcdab89, 0x98badcfe, 0x10325476)

    # main loop
    for offset in range(0, len(message), 64):
        s = struct.unpack('<16I', message[offset:offset+64])
        for i in range(64):
            if i < 16:
                f = (b & c) | ((~b) & d)
                g = i
            elif i < 32:
                f = (d & b) | ((~d) & c)
                g = (5*i + 1) % 16
            elif i < 48:
                f = b ^ c ^ d
                g = (3*i + 5) % 16
            else:
                f = c ^ (b | (~d))
                g = (7*i) % 16

            f = (f + a + K[i] + s[g]) & 0xffffffff
            a, b, c, d = d, (b + left_rotate(f, R[i])) & 0xffffffff, b, c

    return struct.pack('<4I', a, b, c, d)

# These vars contain magic constants for the MD5 algorithm
R = (7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22, 7, 12, 17, 22,
     5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20, 5,  9, 14, 20,
     4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23, 4, 11, 16, 23,
     6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21, 6, 10, 15, 21)
K = (0xd76aa478, 0xe8c7b756, 0x242070db, 0xc1bdceee, 0xf57c0faf, 0x4787c62a, 0xa8304613, 0xfd469501,
     0x698098d8, 0x8b44f7af, 0xffff5bb1, 0x895cd7be, 0x6b901122, 0xfd987193, 0xa679438e, 0x49b40821,
     0xf61e2562, 0xc040b340, 0x265e5a51, 0xe9b6c7aa, 0xd62f105d, 0x02441453, 0xd8a1e681, 0xe7d3fbc8,
     0x21e1cde6, 0xc33707d6, 0xf4d50d87, 0x455a14ed, 0xa9e3e905, 0xfcefa3f8, 0x676f02d9, 0x8d2a4c8a,
     0xfffa3942, 0x8771f681, 0x6d9d6122, 0xfde5380c, 0xa4beea44, 0x4bdecfa9, 0xf6bb4b60, 0xbebfbc70,
     0x289b7ec6, 0xeaa127fa, 0xd4ef3085, 0x04881d05, 0xd9d4d039, 0xe6db99e5, 0x1fa27cf8, 0xc4ac5665,
     0xf4292244, 0x432aff97, 0xab9423a7, 0xfc93a039, 0x655b59c3, 0x8f0ccc92, 0xffeff47d, 0x85845dd1,
     0x6fa87e4f, 0xfe2ce6e0, 0xa3014314, 0x4e0811a1, 0xf7537e82, 0xbd3af235, 0x2ad7d2bb, 0xeb86d391)


if __name__ == '__main__':
    # Test our implementation:
    print('hello, world!' + ' MD5: ')
    print(md5(b"hello, world!").hex())  # should output: fc3ff98e8c6a0d3087d515c0473f8677
    print()
    print('1234567890abc' + ' MD5: ')
    print(md5(b"1234567890abc").hex())

实验结果

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hello, world! MD5: 
39b8756af073ecf3eeb3cdfb4e420660

1234567890abc MD5: 
4205357a961ea143667ce88fcf8fe913

Process finished with exit code 0