Python 3 For/While Loops

Question

先进的道歉，我对Python很陌生。但是，我需要创建一个计算程序，计算一个人在一段时间内可以赚取的金额，如果他的第一天为1美分，第二天为2美分，并且每天持续增加一倍。我知道我应该使用&而循环，我只是不完全知道如何执行它。

到目前为止，我有这样的：

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='   ') 

当我跑了，我看到第1天起数为0.02，并复制到每个行两次。任何建议要改变/添加，所以我可以理解这将不胜感激。 谢谢。

Answer 1

首先，我要解释一下你的代码做，然后，什么样的代码会做你想要什么。

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('---  ----------') 

初始化那里，没有错。现在，我们来看看两个for循环。

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，我会建议不要照顾变量的名称。变量day之前已经定义过，但由于它不再用于原来的目的，所以在这里并不重要。

外循环将循环您输入的次数。这里也没有错。
然后，我们将amount_end的值设置为amount_start的当前值的两倍。

现在，让我们来看看内部循环。这里，amount_start的值将通过列表(amount_start, amount_end)。
我们将在此循环中循环两次，首先用amount_start保持其初始值，然后用amount_start取amount_end的值。
这个循环将是相同

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

然后你可以看到为什么它打印在同一行两次。

为了消除重复，使代码更易读，我建议下面的代码：

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 

不要犹豫，问你是否有关于我的回答任何问题。我希望这有助于。

Answer 2

不要窝在for循环

您应该只有一个for循环：

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