[SOLVED] PYTHON

DBabo · 12-03-2012, 04:14 PM

Hello,
why the following code is not working as i expect it to :

Code:

#!/usr/bin/python

from_file ="file.txt"
in_file = open(from_file)

str = in_file.read()

print "Here should be the output from the file - ", in_file.read()
print "Here should be the output from the STR- ", str
in_file.close()

The output is :
Here should be the output from the file -
Here should be the output from the STR- BLAH

in other words print "". in_file.read() doesn't seem to work. I wonder why?

jlinkels · 12-03-2012, 05:07 PM

you have to import sys, not just argv from sys.

Code:

import sys

jlinkels

DBabo · 12-03-2012, 05:11 PM

Quote:

Originally Posted by jlinkels

you have to import sys, not just argv from sys.

Code:

import sys

jlinkels

it doesn't look like it's using it. I took the import completely out ( and updated the code above). Still getting the same behavior.

dugan · 12-03-2012, 05:41 PM

I'm not sure what you expect to see. You read one line from the file and assign it to STR. You then read the next line from the file and print it out. The output shows that the first line read from the file (and assigned to STR) is "BlAH" and the next line read from the file is empty.

DBabo · 12-03-2012, 08:44 PM

Quote:

Originally Posted by dugan

I'm not sure what you expect to see. You read one line from the file and assign it to STR. You then read the next line from the file and print it out. The output shows that the first line read from the file (and assigned to STR) is "BlAH" and the next line read from the file is empty.

well well i wanted to see the content of the file...
But i think I understand what you meant - i read the file into variable str and the pointer (or whatever it's called in python) is @ the end of the file. So when i read the file again - i get 0 bytes.
ekhh silly me.

Thank you for the tip!
AZ

dugan · 12-04-2012, 11:30 AM

Quote:

Originally Posted by DBabo

well well i wanted to see the content of the file... But i think I understand what you meant - i read the file into variable str and the pointer (or whatever it's called in python) is @ the end of the file. So when i read the file again - i get 0 bytes.

You are correct. The read() method reads the entire file, not one line. Silly me too.

Ref: http://docs.python.org/2/library/std...l#file-objects