replace_ending.py

#The replace_ending function replaces the old string in a sentence with the new string, but only if the sentence ends with the old string.
#If there is more than one occurrence of the old string in the sentence, only the one at the end is replaced, not all of them.
#For example, replace_ending("abcabc", "abc", "xyz") should return abcxyz, not xyzxyz or xyzabc.
#The string comparison is case-sensitive, so replace_ending("abcabc", "ABC", "xyz") should return abcabc (no changes made). 


def replace_ending(sentence, old, new):
	# Check if the old string is at the end of the sentence 
	if  sentence.endswith(old)== True:
		# 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[0:-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"