使用 Python 的'w”文件模式有什么含义？

围绕 Python 文件模式的混乱“w

在 Python 中，有许多文件模式允许您以不同的方式与文件交互'w' 就是这样一种模式，它引起了一些混乱。用法：

了解文件模式

根据 Python 文档，“w”模式打开一个文件以进行写入和更新。 mode 表示文件如果存在就会被截断。

为了更清楚地了解不同的文件模式，这里有一个表格概述了它们的行为：

Mode	Description
r	Opens a file for reading only
rb	Opens a file for reading in binary format
r	Opens a file for both reading and writing, with the file pointer at the beginning
rb	Opens a file for both reading and writing in binary format, with the file pointer at the beginning
w	Opens a file for writing only, overwriting any existing file
wb	Opens a file for writing in binary format, overwriting any existing file
w	Opens a file for both writing and reading, overwriting any existing file
wb	Opens a file for both writing and reading in binary format, overwriting any existing file
a	Opens a file for appending, with the file pointer at the end
ab	Opens a file for appending in binary format, with the file pointer at the end
a	Opens a file for both appending and reading, with the file pointer at the end
ab	Opens a file for both appending and reading in binary format, with the file pointer at the end

以 'w ' 模式读取文件

要读取以 'w ' 模式打开的文件，您应该使用“seek()”方法来查找指向文件开头的文件指针。示例：

with open("myfile.txt", "w+") as f:
    f.write("Hello, world!")
    f.seek(0)
    print(f.read())

最后，“w”模式允许读取和写入同一文件，但应谨慎使用，因为它会覆盖任何现有内容。适合您特定需求的一款。

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