在Python中操作文件之read()方法的使用教程

303次阅读  |  发布于5年以前

read()方法读取文件size个字节大小。如果读取命中获得EOF大小字节之前,那么它只能读取可用的字节。
语法

以下是read()方法的语法:


    fileObject.read( size );

参数

返回值

此方法返回读取字符串中的字节数。
例子

下面的例子显示了read()方法的使用。


    #!/usr/bin/python

    # Open a file
    fo = open("foo.txt", "rw+")
    print "Name of the file: ", fo.name

    # Assuming file has following 5 lines
    # This is 1st line
    # This is 2nd line
    # This is 3rd line
    # This is 4th line
    # This is 5th line

    line = fo.read(10)
    print "Read Line: %s" % (line)

    # Close opend file
    fo.close()

当我们运行上面的程序,它会产生以下结果:


    Name of the file: foo.txt
    Read Line: This is 1s

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