fileObject.tell()

假设'foo.txt'文件包含以下文本：
This is 1st line
This is 2nd line
This is 3rd line
This is 4th line
This is 5th line

#!/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()

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

Current Position: 18