Python Read file. Make a List per line

Question

So im wanting to read from a file and put each line of it into a list.

Say I have a file named MyFile.txt or MyFile.csv containing the following three lines of numbers/decimals:

49.55,2,77.09,18,1,2.34,32.11
33,11.22,33.21,56,76.55
8,9,44.7,90.99,12.21,1.01

I want the program to open the file then read line one and put it into a list ~ say L1list. I then want it to make L2list & L3list for lines 2 & 3. Once that's done I want to be able to work out the total for a list, average, max & min etc. I'm pretty confident with this part using sum (), len(),max(), min() etc.

Its the populating of the lists that has me stuck. Im getting the wrong totals, lengths etc. Thought maybe its the full-stops or comers. but i need the decimal places and thought lists need the comers to separate.

So far i have tried:

filename = 'MyFile.txt' 
fin=open(filename,'r')
L1list = fin.readline()
L2list = fin.readline()
L3list = fin.readline()

Also:

L1list.append(fin.readline())

Along with:

L1list = [i.strip().split() for i in fin.readlines()]

A little stuck as to whats going wrong.

Artsiom Rudzenka · Accepted Answer · 2012-11-06 03:58:43Z

5

So what goes wrong with your code? Have your tried something like this:

L1list = [map(float, i.strip().split(',')) for i in fin.readlines()]

Or with data check:

with open(filename,'r') as fin:
    values = [map(float, [x for x in line.strip().split(',') if x]) for line in fin]

Also you can take a look at the csv module

edited Nov 6, 2012 at 3:58

answered Nov 6, 2012 at 3:49

Artsiom Rudzenka

29.3k5 gold badges36 silver badges53 bronze badges

Sign up to request clarification or add additional context in comments.

2 Comments

Artsiom Rudzenka Over a year ago

Thanx and sorry @Aniket- was a bit disappointed by removing the text from my post

Aniket Inge Over a year ago

I was kidding with the -ve vote. I thought its the most elegant solution for this problem, you put in comments and was going to ask you to post it as an answer.

light · Accepted Answer · 2012-11-06 03:51:03Z

1

I believe you need something like:

L1list = map(float, fin.readline().strip().split(","))

answered Nov 6, 2012 at 3:51

light

4212 silver badges2 bronze badges

Comments

lk_vc · Accepted Answer · 2012-11-06 03:52:18Z

1

>>> '49.55,2,77.09,18,1,2.34,32.11'.split(',')
['49.55', '2', '77.09', '18', '1', '2.34', '32.11']

Please try to print and see what's going on.

And you may want to use http://docs.python.org/2/library/csv.html for more complex CSV file.

answered Nov 6, 2012 at 3:52

lk_vc

1,18221 silver badges27 bronze badges

Collectives™ on Stack Overflow

Python Read file. Make a List per line

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

3 Answers 3

2 Comments

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related