Solved

Reading / Parsing IP and Port from file

Posted on 2008-06-22
1
789 Views
Last Modified: 2012-05-05
I'm trying to read and parse the ip and port from a file. I'm pretty close to getting it, but
somethings not right.

The file is data.txt has the contents
IP_ADDRESS=127.0.0.1
PORT=3031

The result after running the program is backwards
PORT:  127.0.0.1

IP:  3031

Why I don't understand and what to do to make PORT: 3031 and IP: 127.0.0.1
myFile = open("data.txt","r")
for line in myFile.readlines():
	if line.find("PORT"):
		ip = line.split("=")[1]
		print "PORT:  " + str(ip)
	elif line.find("IP_ADDRESS"):
		port = line.split("=")[1]
		print "IP:  " + str(port)

Open in new window

0
Comment
Question by:mitchguy
1 Comment
 
LVL 14

Accepted Solution

by:
RichieHindle earned 50 total points
ID: 21841838
The "find" method returns -1 if it doesn't find anything, and "if -1" succeeds - that is, -1 is considered to be True.

What you'd better off doing is saying 'if "PORT" in line:" - it's easier to read and it does exactly what you want.

Your "port" and "ip" variables are the wrong way round - you're parsing the port into a variable called "ip" and vice versa.  It's not the cause of any breakage, but it could be the cause of confusion!

An aside: your output is double-spaced because the lines you're iterating through contain the newlines from data.txt, but your "print" statements are adding newlines as well.  Using line.strip() prevents that.

Here's the working code:

myFile = open("data.txt","r")
for line in myFile.readlines():
        line = line.strip()
        if "PORT" in line:
                port = line.split("=")[1]
                print "PORT:  " + str(port)
        elif "IP_ADDRESS" in line:
                ip = line.split("=")[1]
                print "IP:  " + str(ip)

Open in new window

0

Featured Post

ScreenConnect 6.0 Free Trial

Discover new time-saving features in one game-changing release, ScreenConnect 6.0, based on partner feedback. New features include a redesigned UI, app configurations and chat acknowledgement to improve customer engagement!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Suggested Solutions

Less strange, but still introduction This introduction was added (1st August, 2011) to reflect some reactions.  Firstly, the term basics in the title of the article...  As any other word, it is a symbol with meaning attached to the word by some a…
Article by: Swadhin
Introduction of Lists in Python: There are six built-in types of sequences. Lists and tuples are the most common one. In this article we will see how to use Lists in python and how we can utilize it while doing our own program. In general we can al…
Learn the basics of strings in Python: declaration, operations, indices, and slicing. Strings are declared with quotations; for example: s = "string": Strings are immutable.: Strings may be concatenated or multiplied using the addition and multiplic…
Learn the basics of while and for loops in Python.  while loops are used for testing while, or until, a condition is met: The structure of a while loop is as follows:     while <condition>:         do something         repeate: The break statement m…

803 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question