replace_sentence_ending.py

def replace_ending(sentence, old, new):
	# Check if the old string is at the end of the sentence 
	if sentence.endswith(old):
		# Using i as the slicing index, combine the part
		# of the sentence up to the matched string at the 
		# end with the new string
		i = len(old)
		new_sentence = sentence[:-i]+new
		return new_sentence

	# Return the original sentence if there is no match 
	return sentence
	
print(replace_ending("It's raining cats and cats", "cats", "dogs")) 
# Should display "It's raining cats and dogs"
print(replace_ending("She sells seashells by the seashore", "seashells", "donuts")) 
# Should display "She sells seashells by the seashore"
print(replace_ending("The weather is nice in May", "may", "april")) 
# Should display "The weather is nice in May"
print(replace_ending("The weather is nice in May", "May", "April")) 
# Should display "The weather is nice in April"