how to convert char to string in pythong code example

Example: python string to list of chars

l = list('abcd')  	        # ['a', 'b', 'c', 'd']
l = map(None, 'abcd')       # ['a', 'b', 'c', 'd']
l = [i for i in 'abcd']	    # ['a', 'b', 'c', 'd']

import re               # importing regular expression module
l = re.findall('.', 'abcd')
print(l)                	# ['a', 'b', 'c', 'd']