This function should take a main string and a substring as inputs and return the number of occurrences of the substring within the main string. It should not be case-sensitive and may overlap.
Input: Two strings (str).
Output: Integer (int).
assert count_occurrences("hello world hello", "hello") == 2 assert count_occurrences("Hello World hello", "hello") == 2 assert count_occurrences("hello", "world") == 0 assert count_occurrences("hello world hello world hello", "world") == 2
How it’s used:
- in a word processing software to highlight or replace all occurrences of a particular word or phrase;
- in website scraping to count the number of times a particular keyword appears;
- in an analytics application to analyze the frequency of certain words or phrases in a body of text.
- both inputs should be strings: mainStr ∈ string and subStr ∈ string;
- the main string can have any length, including zero: 0 <= length(mainStr) <= N;
- the substring should not be an empty string: length(subStr) > 0.
CheckiO Extensions allow you to use local files to solve missions. More info in a blog post.
In order to install CheckiO client you'll need installed Python (version at least 3.8)
Install CheckiO Client first:
pip3 install checkio_client
Configure your tool
checkio --domain=py config --key=
Sync solutions into your local folder
(in beta testing) Launch local server so your browser can use it and sync solution between local file end extension on the fly. (doesn't work for safari)
checkio serv -d
Alternatevly, you can install Chrome extension or FF addon
checkio install-plugin --ff
checkio install-plugin --chromium