August 22, 2018

Convert comma separated string to integer list in Python

Problem

Given a string of comma separated numbers, we want to convert that string to a Python list of integers

Solution

The idea here is to split the string into tokens then convert each token to an integer. We can do that in a couple of ways. Let us see how…

Use a list comprehension and the split function using the comma as a delimiter

string = " 33 , 2 , 6 "
integers = [int(i) for i in string.split(',')]
print(integers)

string = " 33 , 2 , 6 "

integers = [int(i) for i in string.split(',')]

print(integers)

Same as before but using map…

string = " 33 , 2 , 6 "
integers = [i for i in map(int, string.split(','))]
print(integers)

string = " 33 , 2 , 6 "

integers = [i for i in map(int, string.split(','))]

print(integers)

Similar approach but using regular expressions

import re
string = " 33 , 2 , 6 "
integers = [int(i) for i in re.findall(r'\d+', string)]
print(integers)

import re

string = " 33 , 2 , 6 "

integers = [int(i) for i in re.findall(r'\d+', string)]

print(integers)

Finally, a manual solution

integers = []
c = ''
for i in string:
    if i.isdigit():
        c = c + i
    else:
        if c.isdigit():
            integers.append(int(c))
        c = ''
print(integers)

integers = []

c = ''

for i in string:

if i.isdigit():

c = c + i

else:

if c.isdigit():

integers.append(int(c))

c = ''

print(integers)

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Convert comma separated string to integer list in Python

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