Number Base
Do you remember the radix and Numeral systems from math class? Let's practice with it.
You are given a positive number as a string along with the radix for it. Your function should convert it into decimal form. The radix is less than 37 and greater than 1. The task uses digits and the letters A-Z for the strings.
Watch out for cases when the number cannot be converted. For example: "1A" cannot be converted with radix 9. For these cases your function should return -1.
Input: Two arguments. A number as string and a radix as an integer.
Output: The converted number as an integer.
Example:
checkio("AF", 16) == 175
checkio("101", 2) == 5
checkio("101", 5) == 26
checkio("Z", 36) == 35
checkio("AB", 10) == -1
How it is used: Here you will learn how to work with the various numeral systems and handle exceptions.
Precondition:
re.match("\A[A-Z0-9]\Z", str_number)
0 < len(str_number) ≤ 10
2 ≤ radix ≤ 36
We have an adviser team on CheckiO, so if you get stuck solving a challenge, use the “ask advisers” function to ask someone a question about it.
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
checkio sync
(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
checkio install-plugin --ff
checkio install-plugin --chromium
Read more here about other functionality that the checkio client provides. Feel free to submit an issue in case of any difficulties.
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