# 写入文件
def write_to_file(filename, content):
    with open(filename, 'w') as file:
        file.write(content)
    print("Content has been written to", filename)
# 读取文件
def read_from_file(filename):
    try:
        with open(filename, 'r') as file:
            content = file.read()
            print("Content read from", filename, ":", content)
    except FileNotFoundError:
        print("File not found:", filename)
# 测试写入文件
write_to_file("example.txt", "This is an example content.")
# 测试读取文件
read_from_file("example.txt")