如何打印字符串中每行的行号？

def print_line_numbers(string):
    lines = string.split("\n")  # 按行分割字符串
    for i, line in enumerate(lines, 1):  # 遍历每一行并添加行号
        line_with_number = f"{i}: {line}"  # 添加行号
        print(line_with_number)  # 打印带有行号的每行内容

# 测试示例
string = "Hello\nWorld\nThis is a test"
print_line_numbers(string)

1: Hello
2: World
3: This is a test