如何检查文件中的所有字符是否都以特定的编码出现？

import chardet

def check_file_encoding(file_path, target_encoding):
    with open(file_path, 'rb') as file:
        content = file.read()
    
    encoding = chardet.detect(content)['encoding']
    
    result = []
    for char in content.decode(encoding):
        char_encoding = chardet.detect(char.encode(encoding))['encoding']
        if char_encoding == target_encoding:
            result.append((char, True))
        else:
            result.append((char, False))
    
    return result

file_path = 'path/to/file.txt'
target_encoding = 'utf-8'

result = check_file_encoding(file_path, target_encoding)

for char, is_target_encoding in result:
    if not is_target_encoding:
        print(f"Character '{char}' is not in the target encoding '{target_encoding}'.")