Is there a command that returns the number of substrings in a string?

[Peng Yu]

For example, the long string is 'abcabc' and the given string is
'abc', then 'abc' appears 2 times in 'abcabc'. Currently, I am calling
'find()' multiple times to figure out how many times a given string
appears in a long string. I'm wondering if there is a function in
python which can directly return this information.