This is just a heads up that there is a bug in the test cases for 10. Censor, https://www.codecademy.com/courses/python-intermediate-en-rCQKw/1/4?curriculum_id=4f89dab3d788890003000096.
In the instructions it says:
01. Assume your input strings won't contain punctuation or upper case letters.
However, one of the test cases is the following, which clearly has upper case letters in it.
censor("Yo go fro yo go","go")
Please be aware of this when writing your solution. As in, don't bother changing the inputs to lowercase since you will fail the test cases.