我可以縮短這個嗎？ IE沒有百分比=被使用兩次？

Question

percentage = int(input("\nWhat percentage of your bill would you like to calculate? ")) 
percentage = float(round(percentage/100 * bill, 2)) 

大家好

新的Python，不知道上面的代碼兩行是否可縮短至僅包括「百分比=」一次？

由於「百分比」變量是由用戶輸入定義的，我假設在這樣做之前，我無法將「百分比」定義爲方程式，因此兩個單獨的代碼行？

如果它有助於瞭解最終目標，那麼這裏是代碼作爲一個整體 - 這是一個簡單的小費計算器：

# Tip calculator 
# calculates a %15 and %20 tip for any given meal 
# code by c07vus 


print("\nHello, welcome to tip calculator!") 

bill = float(input("\nIn £'s what was the bill total? ")) 

fifteen = float(round(15/100 * bill, 2)) 

twenty = float(round(20/100 * bill, 2)) 

print("\nA %15 tip of your bill would be:", fifteen, "pounds") 
print("\nA %20 tip of your bill would be:", twenty, "pounds") 

print("\nYou can also calculate any percentage you like!") 

percentage = int(input("\nWhat percentage of your bill would you like to calculate? ")) 
percentage = float(round(percentage/100 * bill, 2)) 

print("\nThank you, your tip would be:", percentage, "pounds") 

input("\n\nPress the enter key to exit") 

感謝所有幫助和建議！

Answer 1

當然，你可以把它放在一行：只要把你指定的表達式percentage放到你在第二行使用該值的地方。但不要指望這條線是漂亮的，或可讀......

percentage = float(round(int(input("\nWhat percentage of your bill would you like to calculate? "))/100 * bill, 2)) 

一般情況下，我會跟你現在的版本棒。但是，在這種特殊情況下，我會重命名第二個變量，因爲這不再是百分比！這是小費。

percentage = int(input("\nWhat percentage of your bill would you like to calculate? ")) 
tip = float(round(percentage/100 * bill, 2)) 

此外，你做了三次計算！這應該是足夠的理由讓這樣的功能：

to_tip = lambda percent: float(round(percent/100 * bill, 2)) 
... # use that same function to calculate fifteen and twenty 
tip = to_tip(percentage) 

最後，如果你想顯示的結果正好兩位小數，使用格式字符串比四捨五入更好。

print("\nThank you, your tip would be: {:.2f} pounds".format(tip))