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I am trying to run a program like

import os,sys
from scipy import stats
import numpy as np

f=open('data2.txt', 'r').readlines()
for i in range(0,N):
    list1=[float(x) for x in l1]
    list2=[float(x) for x in l2]
    print result[1]

However, it is frequently returning the same error:

ValueError: could not convert string to float: id

Do you have any idea about this error?

12 7 7
15,250 points

1 Answer

2 votes
Best answer


Somewhere in your text file, a line has the word id in it, which can't really be converted to a number.

Your test code works because of the word id isn't present in line 2.

If you want to catch that line, try this code. I cleaned your code up a tad:

import os, sys
from scipy import stats
import numpy as np

for index, line in enumerate(open('data2.txt', 'r').readlines()):
    w = line.split(' ')
    l1 = w[1:8]
    l2 = w[8:15]

        list1 = map(float, l1)
        list2 = map(float, l2)
    except ValueError:
        print 'Line {i} is corrupt!'.format(i = index)'

    result = stats.ttest_ind(list1, list2)
    print result[1]


13 9 6
94,240 points

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