Python中tell()方法的使用详解

tell()方法返回的文件内的文件读/写指针的当前位置。
语法

以下是tell()方法的语法：

    fileObject.tell()

参数

• NA

返回值

此方法返回该文件中读出的文件/写指针的当前位置。
例子

下面的例子显示了tell()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.readline()
    print "Read Line: %s" % (line)

    # Get the current position of the file.
    pos = fo.tell()
    print "Current Position: %d" % (pos)

    # 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 1st line

    Current Position: 18