how to convert string to list in python without split code example

Example 1: python string to list without split

sentence = 'This is a sentence'
split_value = []
tmp = ''
for c in sentence:
    if c == ' ':
        split_value.append(tmp)
        tmp = ''
    else:
        tmp += c
if tmp:
    split_value.append(tmp)

Example 2: Splitting strings in Python without split()

sentence = 'This is a sentence'
word=""
for w in sentence :
    if w.isalpha():
        word=word+w

    elif not w.isalpha():
      print(word)
      word=""
print(word)