Separate string by characters in python

Question

I'm trying to separate characters from any given strings and making subsring with it. For example,

str='abcd' => 'ab','bc','cd'

Here is my solution,

str='abcdef'
a=[]
for i in range(len(str)):
  a.append(str[i:i+2])
a.remove(a[-1])
print(a)

This works but I would like to know better way to do it.

Thanks

Answer 1

A possible solution without external modules (like your implementation, but cleaner).

[my_str[i:i+2] for i in range(len(my_str) - 1)]

so

In [3]: my_str='abcdef'

In [4]: [my_str[i:i+2] for i in range(len(my_str) - 1)]
Out[4]: ['ab', 'bc', 'cd', 'de', 'ef']

Answer 2

Use zip() (Built-in):

[f'{x}{y}' for x, y in zip(s, s[1:])]

Code:

s = 'abcdef'

print([f'{x}{y}' for x, y in zip(s, s[1:])]) # Python 3.6+. For previous versions, use below line.
# [x + y for x, y in zip(s, s[1:])] 

# Outputs: ['ab', 'bc', 'cd', 'de', 'ef']