I enjoyed this one, thank you. One small issue is that on the Python version, False is written as false with a lowercase f in the description. At first I was a bit confused, thinking maybe the tests were expecting us to return a string saying "false" if there was a problem with generating the hashtag. In other words True and False are capitalized in Python.

Just a small quibble

What an obtuse requirement

That is what has happened to me. 114 correct, 1 incorrect. No idea what is wrong.
e: There is an obtuse requirement for "vacuous truth", another comment goes into more detail.

Thanks for that explanation, silly me.

Why are some of the test answers supposed to be 1 for Python? Surely any of the cases where there is only 1 string of 4 zeros should return 0?