修剪流的最后一个字符

def trim_last_char(input_str):
    if len(input_str) > 0:
        return input_str[:-1]
    else:
        return input_str

# 示例使用
original_string = "Hello World!"
trimmed_string = trim_last_char(original_string)
print(trimmed_string)  # 输出: Hello World

def trim_last_char_from_file(file_path):
    with open(file_path, 'r') as file:
        content = file.read()
    trimmed_content = trim_last_char(content)
    return trimmed_content

# 假设有一个文件名为example.txt，内容为"Example text."
trimmed_content = trim_last_char_from_file('example.txt')
print(trimmed_content)  # 输出: Example text