Python如何写入文件？
1 个回答｜292 次阅读
仍然使用open()函数,将模式改为w或a打开文件来创建文件对象。w模式下会覆盖旧数据写入新数据，a模式下可在原有数据基础上增加新数据。
>>> # 向文件中写入新数据
... with open("hello3.txt", 'w') as file:
... text_to_write = "Hello Files From Writing"
... file.write(text_to_write)
...
>>> # 增加一些数据
... with open("hello3.txt", 'a') as file:
... text_to_write = "
Hello Files From Appending"
... file.write(text_to_write)
...
>>> # 检查文件数据是否正确
... with open("hello3.txt") as file:
... print(file.read())
...
Hello Files From Writing
Hello Files From Appending
上面每次打开文件时都使用with语句。
with语句为我们创建了一个处理文件的上下文，当我们完成文件操作后，它可以关闭文件对象。这点很重要，如果我们不及时关闭打开的文件对象，它很有可能会被损坏。
Coco老师