Sort Array by Element Frequency
Sort the given list so that its elements should be grouped and those groups end up in the decreasing frequency order, that is, the number of times element appears in list. If two elements have the same frequency, their groups should end up in the same order as the first appearance of element in the list.
If you want to practice more with the similar case, try Frequency Sorting mission.
Input: List
Output: List or another Iterable (tuple, iterator, generator)
Examples:
assert list(frequency_sort([4, 6, 2, 2, 6, 4, 4, 4])) == [4, 4, 4, 4, 6, 6, 2, 2]
assert list(frequency_sort([4, 6, 2, 2, 2, 6, 4, 4, 4])) == [4, 4, 4, 4, 2, 2, 2, 6, 6]
assert list(frequency_sort(["bob", "bob", "carl", "alex", "bob"])) == [
"bob",
"bob",
"bob",
"carl",
"alex",
]
assert list(frequency_sort([17, 99, 42])) == [17, 99, 42]
How it is used: For analyzing data using mathematical statistics and mathematical analysis, and for finding trends and predicting future changes (systems, phenomena, etc.)
Precondition:
- elements can be ints or strings
The mission was taken from Python CCPS 109 Fall 2018. It's being taught for Ryerson Chang School of Continuing Education by Ilkka Kokkarinen
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.
