Python：带有计数器的for循环和计划增加的增加答案

【问题标题】：Python: for loop with counter and scheduled increase in increasePython：带有计数器的for循环和计划增加的增加
【发布时间】：2021-07-19 04:16:23
【问题描述】：

Python 学习者。处理每月定期存款，利息问题。除了在这个假设中，我被要求每 6 个月加薪一次。我在比预期更少的几个月内达到了目标数量。

目前正在使用 % 函数和 += 函数

annual_salary = float(input("What is your expected Income? "))                  
portion_saved = float(input("What percentage of your income you expect to save? "))
total_cost = float(input("what is the cost of your dream home? "))
semi_annual_raise = float(input("Enter your expected raise, as a decimal "))

monthly_salary = float(annual_salary/12)
monthly_savings = monthly_salary * portion_saved
down_payment= total_cost*.25
           
savings = 0
for i in range(300):
    savings = monthly_savings*(((1+.04/12)**i) - 1)/(.04/12)
    if float(savings) >= down_payment:
            break
    if i % 6 == 0 :
        monthly_salary += monthly_salary * .03
        monthly_savings = monthly_salary * portion_saved

【问题讨论】：

您的预期结果是什么。还有什么'n'
monthly_savings 值是多少，r 是多少，您预计需要多少个月？
在 115 个月而不是 142 个月内达到了储蓄目标。在原始帖子中添加了上下文。谢谢。
你应该考虑在第一个月加薪吗？当 'i' 为 0 时，monthly_salary 将被更新。 Range(1, 301) 会解决这个问题。

标签： python loops counter

【解决方案1】：

感谢大家的建议。我的代码越来越清晰，我得到了正确的输出！问题在于我计算利息的方式和时间。在静态贡献的情况下，我成功地使用了定期存款利息的公式，在这里，需要更简单的每月计算利息的移动来处理循环流程。

annual_salary = float(input("What is your expected Income? "))                  
portion_saved = float(input("What percentage of your income you expect to save? "))
total_cost = float(input("what is the cost of your dream home? "))
semi_annual_raise = float(input("Enter your expected raise, as a decimal "))
monthly_salary = float(annual_salary/12)
monthly_savings = monthly_salary * portion_saved
down_payment = total_cost*.25

savings = 0
month = 1
while savings < down_payment :
    print(savings)
    savings += monthly_savings
    savings = savings * (1+(.04/12))
    month += 1  

    if month % 6 == 0 :
            monthly_salary += (monthly_salary * semi_annual_raise)
            monthly_savings = (monthly_salary * portion_saved)

print("")
print("it will take " + str(month) + " months to meet your savings goal.")

【讨论】：

【解决方案2】：

这样的事情对你有用吗？通常，当我们不知道循环最终需要多少次迭代时，我们希望使用while 循环而不是for 循环。

monthly_savings = 1.1 # saving 10% each month
monthly_salary = 5000
down_payment = 2500
interest = .02
savings = 0
months = 0

while savings < goal:
    print(savings)
    savings = (monthly_salary * monthly_savings) + (savings * interest)
    months += 1
    
    if months % 6 == 0 :
        monthly_salary += monthly_salary * .03
        
print("Took " + str(months) + " to save enough")

【讨论】：