Python 3 For/While Loops

Question

先進的道歉，我對Python很陌生。但是，我需要創建一個計算程序，計算一個人在一段時間內可以賺取的金額，如果他的第一天爲1美分，第二天爲2美分，並且每天持續增加一倍。我知道我應該使用&而循環，我只是不完全知道如何執行它。

到目前爲止，我有這樣的：

day = int(input('How many days did you work?: ')) 
start = 1 
end = day 
amount_start = 0.01 

print() 
print('Day  Amount ($)') 
print('---  ----------') 

for day in range(start, end + 1): 
    amount_end = amount_start * 2 
    for amount_start in (amount_start, amount_end): 
     print(day, amount_end, sep='   ') 

當我跑了，我看到第1天起數爲0.02，並複製到每個行兩次。任何建議要改變/添加，所以我可以理解這將不勝感激。 謝謝。

Answer 1

首先，我要解釋一下你的代碼做，然後，什麼樣的代碼會做你想要什麼。

day = int(input('How many days did you work?: ')) 
start = 1 
end = day 
amount = 0.01 # Start and End shouldn't be a thing 
total = 0 # I think this is what you wanted... the amount will double every time and the total will be increased by the amount every time 

print() 
print('Day  Amount ($)') 
print('---  ----------') 

初始化那裏，沒有錯。現在，我們來看看兩個for循環。

for day in range(start, end + 1): 
    amount_end = amount_start * 2 
    for amount_start in (amount_start, amount_end): 
     print(day, amount_end, sep='   ') 

首先，我會建議不要照顧變量的名稱。變量day之前已經定義過，但由於它不再用於原來的目的，所以在這裏並不重要。

外循環將循環您輸入的次數。這裏也沒有錯。
然後，我們將amount_end的值設置爲amount_start的當前值的兩倍。

現在，讓我們來看看內部循環。這裏，amount_start的值將通過列表(amount_start, amount_end)。
我們將在此循環中循環兩次，首先用amount_start保持其初始值，然後用amount_start取amount_end的值。
這個循環將是相同

amount_start = amount_start 
print(day, amount_end, sep='   ') 
amount_start = amount_end 
print(day, amount_end, sep='   ') 

然後你可以看到爲什麼它打印在同一行兩次。

爲了消除重複，使代碼更易讀，我建議下面的代碼：

day = int(input('How many days did you work?: ')) 
start = 1 
end = day 
amount_start = 0.01 

print() 
print('Day  Amount ($)') 
print('---  ----------') 

for day in range(start, end + 1): 
    amount_end = amount_start * 2 
    print(day, amount_end, sep='   ') 
    amount_start = amount_end 

不要猶豫，問你是否有關於我的回答任何問題。我希望這有助於。

Answer 2

不要窩在for循環

您應該只有一個for循環：

day = int(input('How many days did you work?: ')) 
start = 1 
end = day 
amount = 0.01 # Start and End shouldn't be a thing 
total = 0 # I think this is what you wanted... the amount will double every time and the total will be increased by the amount every time 

print() 
print('Day  Amount ($)') 
print('---  ----------') 

for day in range(start, end + 1): 
    total += amount # Give the person salary 
    print(day, total, sep='   ') # Print the total amount of money earned 
    amount *= 2 # Double the salary