For the text "the cat sat on the mat", write the program lines that show: how many times at occurs…

Plan. Use count(), find() and startswith().

1. at occurs in cat, sat and mat: three times.
2. The first sat starts at position 8. Count: the is 4 characters (0 to 3), cat is 4 more (4 to 7), so sat starts at 8.
3. dog is not there, so find() gives -1.
4. The text does start with the, so the answer is True.