如何获取在Python中打开的文件的行号

import linecache

import linecache

def get_line_number(file_name, line_content):
    with open(file_name, 'r') as file:
        for line_num, line in enumerate(file, 1):
            if line.strip() == line_content:
                return line_num
    return -1

file_name = 'example.txt'
line_content = 'Hello, World!'

line_number = get_line_number(file_name, line_content)
if line_number != -1:
    print(f"The line number of '{line_content}' in '{file_name}' is {line_number}.")
else:
    print(f"'{line_content}' not found in '{file_name}'.")