[Python] Using the .find() function in a loop

I was trying to get the last word of the sentence using the .find() method in a loop. My code:

sentence = "please write a program which keeps asking the user for words"
index = 0
substring = sentence.find(" ")
while index < len(sentence):
substring = sentence.find(" ")
sentence = sentence[substring+1:]
index += 1
print(sentence)


This code works when the sentence is:

sentence = "it was a dark and stormy python"


but it doesn't work when the sentence is:

sentence = "please write a program which keeps asking the user for words"


I want to know why that is and what will be the correct way to do this without using .split().

I expect the code to output the last word in the sentence.

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