Solved

Reading / Parsing IP and Port from file

Posted on 2008-06-22
1
801 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

Networking for the Cloud Era

Join Microsoft and Riverbed for a discussion and demonstration of enhancements to SteelConnect:
-One-click orchestration and cloud connectivity in Azure environments
-Tight integration of SD-WAN and WAN optimization capabilities
-Scalability and resiliency equal to a data center

Question has a verified solution.

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

Suggested Solutions

The really strange introduction Once upon a time there were individuals who intentionally put the grass seeds to the soil with anticipation of solving their nutrition problems. Or they maybe only played with seeds and noticed what happened... Som…
Here I am using Python IDLE(GUI) to write a simple program and save it, so that we can just execute it in future. Because when we write any program and exit from Python then program that we have written will be lost. So for not losing our program we…
Learn the basics of lists in Python. Lists, as their name suggests, are a means for ordering and storing values. : Lists are declared using brackets; for example: t = [1, 2, 3]: Lists may contain a mix of data types; for example: t = ['string', 1, T…
Learn the basics of if, else, and elif statements in Python 2.7. Use "if" statements to test a specified condition.: The structure of an if statement is as follows: (CODE) Use "else" statements to allow the execution of an alternative, if the …

830 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