Python3 写入文件

最新推荐文章于 2025-07-07 09:59:50 发布

转载最新推荐文章于 2025-07-07 09:59:50 发布 · 150 阅读

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原文链接：http://www.cnblogs.com/sxx-java/p/6433962.html

文章标签：

#python

Demo:

file = open("test.txt", "wb")
file.write("string")

上面这段代码运行会报类型错误：TypeError: a bytes-like object is required, not 'str'

wirte方法是将一个字节缓冲区写入到目标文件中，而不支持string类型

write源码：

def write(self, *args, **kwargs): # real signature unknown
    """
    Write buffer b to file, return number of bytes written.

    Only makes one system call, so not all of the data may be written.
    The number of bytes actually written is returned.  In non-blocking mode,
    returns None if the write would block.
    """
    pass

注：python3 将字符串写入到目标文件时，必须先将字符串转换为字节才能写入，python2可以直接将字符串写入到目标文件中

转载于:https://www.cnblogs.com/sxx-java/p/6433962.html