Shuffle lines of a file using Python

[IgorM]

I am trying to shuffle the lines of a file to use on a perceptron algorithm but the problem is by doing so one line always has 2 entries:

 

import random
with open("infile.txt") as f:
    lines = f.readlines()
random.shuffle(lines)
with open("outfile.txt", "w") as f:
    f.writelines(lines)

Original part of the source file:

5.1,3.5,1.4,0.2,Iris-setosa
4.9,3.0,1.4,0.2,Iris-setosa
4.7,3.2,1.3,0.2,Iris-setosa
4.6,3.1,1.5,0.2,Iris-setosa
5.1,3.3,1.7,0.5,Iris-setosa
4.8,3.4,1.9,0.2,Iris-setosa
5.0,3.0,1.6,0.2,Iris-setosa
5.0,3.4,1.6,0.4,Iris-setosa
5.2,3.5,1.5,0.2,Iris-setosa

Output file:

 

5.0,3.5,1.6,0.6,Iris-setosa
6.4,2.7,5.3,1.9,Iris-virginica
6.6,2.9,4.6,1.3,Iris-versicolor
6.3,2.3,4.4,1.3,Iris-versicolor
5.9,3.0,5.1,1.8,Iris-virginica4.6,3.1,1.5,0.2,Iris-setosa
5.0,3.3,1.4,0.2,Iris-setosa
5.7,2.8,4.1,1.3,Iris-versicolor
5.1,3.5,1.4,0.2,Iris-setosa
5.8,4.0,1.2,0.2,Iris-setosa
6.0,2.2,4.0,1.0,Iris-versicolor
4.9,3.1,1.5,0.1,Iris-setosa
6.3,2.5,5.0,1.9,Iris-virginica
5.1,3.4,1.5,0.2,Iris-setosa
4.9,3.0,1.4,0.2,Iris-setosa

 

[WereCatf]

11 minutes ago, IgorM said:

I am trying to shuffle the lines of a file to use on a perceptron algorithm but the problem is by doing so one line always has 2 entries

Just a hunch, but does the last line in the input-file include the newline-character or not? I'd assume it doesn't, which would explain your issue. You could simply check if the last line has a newline-character in it and, if it doesn't, add it there.

[IgorM]

8 hours ago, WereCatf said:

Just a hunch, but does the last line in the input-file include the newline-character or not? I'd assume it doesn't, which would explain your issue. You could simply check if the last line has a newline-character in it and, if it doesn't, add it there.

that was it. Thanks!