Codewars note - Abbreviate a Two Word Name-名字缩写

Write a function to convert a name into initials. This kata strictly
takes two words with one space in between them.
The output should be two capital letters with a doseparating
them.
It should look like this:
Sam Harris=>S.H
patrick feeney => P.F

Solution：

sentencce = "hello world"

sentence = sentence.title() #首字母大写
s = [i[0:1] for i in sentence.split()] #字符串切片 选取每个片段的第一个字符

s_dot = ''
for i in s:
    s_dot =s_dot + i + "."
    
print(s_dot.strip('.'))

H.W