How to import .txt file into python

Question

I have a text file with many values like

2.81,5.62
7.14,8.00
2.72,5.44
3.87,7.74
1.90,3.80
7.82,8.00
7.02,8.00
5.50,8.00
9.15,8.00
4.87,8.00
8.08,8.00
5.58,8.00
9.13,8.00

Now I need to read these values as I want to put the first value into an array array1 and then the second value in an array array2.

Solution 1

You just have to:

1. open() file in read-only mode
2. read() each line
3. for each line in file
   4. split() each line at ,
   5. append() first part to array1 and second part to array2
   6. done

Code:

array1 = []
array2 = []
with open('filename.txt', 'r') as f:
    for line in f.readlines():
        l = line.strip().split(',')
        array1 = l[0]
        array2 = l[1]

Solution 2

You can use readlines() to read all the lines, and then split each line by the , character:

f = open('numbers.txt', 'r')
list1, list2 = zip(*[x.split(',') for x in f.readlines()])

Solution 3

You could use numpy:

my_data = np.loadtxt('poo.txt', delimiter=",", unpack=True)
list1, list2 = my_data[::] #unpack your array