CODEWITHSUNDEEP
python
user2468702
user2468702

Reputation: 141

Reading numbers in python

I have a text file:

30.154852145,-85.264584254
15.2685169645,58.59854265854
...

I have the following python script:

count = 0

while True:
        count += 1
        print 'val:',count
        for line in open('coords.txt'):
                c1, c2 = map(float, line.split(','))
                break
        print 'c1:',c1
        if count == 2: break

I want c1 = 15.2685169645 for val: 2. Can someone please tell me what I am messing up on?

Upvotes: 1

Views: 68

Answers (2)

Padraic Cunningham
Padraic Cunningham

Reputation: 180391

Using your own loop:

with open('coords.txt') as f:
    count = 1
    while True:
        for line in f:
            print 'val: {}'.format(count)
            c1, c2 = map(float, line.split(','))
            print("c1 = {!r}".format(c1))
            if count == 2:
                break
            count += 1
        break

Upvotes: 1

Martijn Pieters
Martijn Pieters

Reputation: 1121236

By reopening the file each time, you start reading from the start again.

Just open the file once:

with  open('coords.txt') as inputfile:
    for count, line in enumerate(inputfile, 1):
        c1, c2 = map(float, line.split(','))
        print 'c1:',c1
        if count == 2: break

This also uses the file object as a context manager so the with statement will close it for you once done, and uses enumerate() to do the counting.

Upvotes: 3

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