Getting unexpected output of the following code below:

`sample.txt` contains:

> 
> this is the first line  
> 
>  this is the second line  
> 
>  this is the third line  
> 
>  this is the fourth line  
> 
>  this is the fifth line  
> 
>  this is the sixth line 
> 
> 
> 

code: 

```
import sys  

f1=open("sample3.txt",'r')  

print f1.tell()  

for line in f1:  
    print line  
    print "postion of the file pointer",f1.tell()  

```

Output:

```
0  
this is the first line  
postion of the file pointer 141  
this is the second line  
postion of the file pointer 141  
this is the third line  
postion of the file pointer 141  
this is the fourth line  
postion of the file pointer 141  
this is the fifth line  
postion of the file pointer 141  
this is the sixth line  
postion of the file pointer 141  

```

I expect something which shows the file pointer position the end of each line