python文件基础操作实例
    ## Python File Handling Basics with Examples.
    ### Introduction.
    Files are an essential part of any programming language. They allow us to store and retrieve data from a persistent storage, which can be useful for a variety of purposes, such as saving user preferences, storing log files, or sharing data with other applications.
    Python provides a robust set of file handling capabilities, making it easy to work with files in your programs. In this tutorial, we will explore the basics of file handling in Python, including how to open, read, write, and close files. We will also cover some common file handling tasks, such as appending data to a file and reading files line by line.
    ### Opening a File.
    The first step in working with a file is to open it. The open() function is used to open a file,
and it takes two arguments: the name of the file and the mode in which to open it. The mode can be one of the following:
python教程字符串函数    `r` Open the file for reading.
    `w` Open the file for writing.
    `a` Open the file for appending.
    `r+` Open the file for reading and writing.
    `w+` Open the file for writing and reading.
    `a+` Open the file for appending and reading.
    For example, to open a file named "" for reading, we would use the following code:
    python.
    file = open("", "r")。
    ### Reading a File.
    Once a file is open, we can read its contents using the read() function. The read() function takes an optional parameter that specifies the number of bytes to read. If no parameter is specified, the entire file is read.
    For example, to read the entire contents of a file, we would use the following code:
    python.
    file = open("", "r")。
    contents = ad()。

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