帮助python代码 [英] help with python code

问题描述

一个行政区对未来几年人口变化做出如下预测：

？ 2004年初有26000名居民

？出生率和死亡率分别估计为人口的0.7％和0.6％

？每年进出自治市的人数估计分别为300和325.


i必须编写一个程序来计算自治市镇开始时的估计人口数量。年份。有问题的年份应该是用户要求的。


我有，去，但似乎没有用。我想知道如何启动代码。

A borough has made the following prognosis for the changes in population over the next few years:
? At the start of 2004 there were 26 000 inhabitants
? The rates of births and deaths are estimated at 0.7% and 0.6% of the population respectively
? The number of people moving in and out of the borough annually is estimated at 300 and 325 respectively.

i have to write a program that calculate the borough?s estimated population at the beginning of a particular year. The year in question should be requested from the user.

i have had, go, but does not seem to work. i would like help on how to start the code.

推荐答案

向我们展示你到目前为止所做的工作，我们将尽力提供帮助。


我认为计算会是这样的：


人口+ =人口*（birth_rate - death_rate）

人口+ = （movein_rate - moveout_rate）


这个计算需要在目标日期和2004年之间的差异中每年完成。


我将创建一个返回预计人口的函数。

Show us the work you have done so far, and we will try to help.

I think the calculation will go something like this:

population += population*(birth_rate - death_rate)
population += (movein_rate - moveout_rate)

This calculation will need to be done for each year in the difference between the target date and 2004.

I would create a function that returns the projected population.

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一个简单的公式。


（BasePopulation +（MoveinRate - MoveoutRate）*年）*年^（BirthRate - DeathRate）


如果我正确记住我的数学。我不确定的东西。

its a simple formula.

(BasePopulation + (MoveinRate - MoveoutRate) * year) * year^(BirthRate - DeathRate)

If i remember my math correctly. Something i''m not sure of.

尝试使用它来启动

try using this to start

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