Python檔案tell()方法

2019-10-16 23:05:32

Python檔案的tell()方法返回檔案中的檔案讀/寫指標的當前位置。

語法

以下是tell()方法的語法 -

fileObject.tell()

引數

  • NA

返回值

  • 該方法返回檔案讀/寫指標的當前位置。

範例

假設’foo.txt‘檔案中包含以下行 -

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

以下範例顯示了tell()方法的用法。

#!/usr/bin/python3

fo = open("foo.txt", "r+")
print ("Name of the file: ", fo.name)

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

pos=fo.tell()
print ("current position : ",pos)

# Close opened file
fo.close()

執行上面程式碼後,將得到以下結果 -

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

Current Position: 18