Codewars 8 kyu Tip Calculator

Task

Complete the function, which calculates how much you need to tip based on the total amount of the bill and the service.

Verbalization

1. 評価と%をdictionaryで表記する
2. 評価はすべて小文字になおす
3. Return 小数点切り上げの値段×tip rate
4. 評価できない場合は "Rating not recognised"とかえす

Code

import math
def calculate_tip(amount, rating):
    rate_dictionary = {
    "terrible": 0.00,
    "poor": 0.05,
    "good": 0.10,
    "great": 0.15,
    "excellent": 0.20}

    if rating.lower() not in rate_dictionary:
        return "Rating not recognised"
    
    tip_percentage = rate_dictionary[rating.lower()]
    tip_amount = amount * tip_percentage
    
    return math.ceil(tip_amount)

Reference

Pythonで小数点以下を切り捨て・切り上げ: math.floor(), math.ceil()