You are given a string of different characters (letters, digits and other symbols). The goal is to "extract" the number from the string: concatenate only digits, number sign and "." (if present) and return the result in number format. If no number can be extracted (no digits in the given string) - return None. Read preconditions below for some additional rules.
- take into consideration the LAST number sign before the FIRST digit;
- take into consideration the FIRST dot in the string (It's guaranteed, that it goes after at least one digit or has at least one digit after). If there is a dot, return as float, otherwise - integer.
Input: String (str).
Output: Integer (int), float (float) or None.
assert reveal_num("F0(t}") == 0 assert reveal_num("Utc&g") == None assert reveal_num("-aB%|_-+2ADS.12+3.ADS1.2") == 2.12312 assert reveal_num("-aB%|_+-2ADS.12+3.ADS1.2") == -2.12312
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