File函数 中的 file.tell()函数

Python file tell()返回文件中文件读/写指针的当前位置。

file.tell() - 语法

fileObject.tell()

file.tell() - 返回值

此方法返回文件中文件读/写指针的当前位置。

file.tell() - 示例

以下示例显示Tell()方法的用法。

This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/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()

当无涯教程运行上面的程序时，它产生以下输出-

Name of the file:  foo.txt
Read Line: Python is a great language.

Current Position: 28