How to assign two values in for loop variable

Question

how can we use for loop to assign two values from the string like following

string="abcd"
for i in string:
      print(i)

this will give i one value from the string

#output
a
b
c
d

how can i take two values like ab and cd. I know we can do this in print but i need to assign two values in "i" I need output

#output
ab
cd

Answer 1

You could use list-comprehension like the following:

n = 2
s = "abcd"
res = [s[i:i+n] for i in range(0, len(s), n)]
print(res) # ['ab', 'cd']

This is applicable to any n th place.

If its only 2 chars that you are after you can also use regex, but if it for any n its not convenient, an example for n=2 is:

import re
s = "abcd"
res = re.findall('..?',s)
print(res) # ['ab', 'cd']

Answer 2

Try this:

string = "abcd"
for i in range(1,len(string),2):
    print(string[i-1]+string[i])

Output:

ab
cd

Explanation

You can modify the range function to start at index 1 and go all the way through len(string) in steps of 2( range(1,len(string),2) )

Then inside the loop, since we start index 1, we print string[i-1] and concatenate with string[i]