使用md5()函数在Python中对文件进行校验和计算的示例代码

示例代码如下所示：

import hashlib

def calculate_md5(file_path):
    try:
        # Open the file in binary mode
        with open(file_path, 'rb') as file:
            # Create an instance of the MD5 hash object
            md5_hash = hashlib.md5()

            # Read the file in chunks and update the hash object
            for chunk in iter(lambda: file.read(4096), b''):
                md5_hash.update(chunk)

            # Get the final MD5 hash value as a hexadecimal string
            md5_checksum = md5_hash.hexdigest()

            # Return the MD5 hash value
            return md5_checksum

    except IOError:
        print(f"Error: Could not open file '{file_path}'")
        return None

# Usage example:
file_path = '/path/to/your/file.ext'
md5_checksum = calculate_md5(file_path)
if md5_checksum:
    print(f"MD5 checksum of {file_path}: {md5_checksum}")

使用例子：

# Example 1: Calculate MD5 checksum of a text file
file_path = 'example.txt'
md5_checksum = calculate_md5(file_path)
if md5_checksum:
    print(f"MD5 checksum of {file_path}: {md5_checksum}")
# Output: MD5 checksum of example.txt: 098f6bcd4621d373cade4e832627b4f6

# Example 2: Calculate MD5 checksum of an image file
file_path = 'example.jpg'
md5_checksum = calculate_md5(file_path)
if md5_checksum:
    print(f"MD5 checksum of {file_path}: {md5_checksum}")
# Output: MD5 checksum of example.jpg: c4ca4238a0b923820dcc509a6f75849b

# Example 3: Calculate MD5 checksum of a non-existing file
file_path = 'non_existing_file.txt'
md5_checksum = calculate_md5(file_path)
# Output: Error: Could not open file 'non_existing_file.txt'