Python 如何修复TypeError:*：'；实例'；和'；浮动'；在函数中

该代码基本上只是一个使用用户输入值的函数。但是，当代码乘以“人口”和“百分比”时，用户会收到标题中的错误。这个错误意味着什么？如何修改代码以停止返回此错误

这是我的密码：

import random
import math

class populationClass:
    food = 0
    population = 0
    percent = 0

    def populationCount(population, self):    
        while True:
            try:        
                food = int(raw_input("Variety of Foood: "))
                if food > 0: break
                else:
                    print "Enter a Positive Integer!"
            except ValueError:
                print "Enter a Positive Integer!"

        if food == 1:
            percent = 5
        elif food == 2:
            percent = 5
        elif food == 3:
            percent = 7
        elif food == 4:
            percent = 7
        elif food == 5:
            percent = 9
        elif food == 6:
            percent = 9
        elif food >= 7:
            percent = 11
        else:
            print "Enter a Positive Number!"

        rand1 = random.randint(1,6)
        rand2 = random.randint(1,6)
        print rand1
        print rand2
        if rand1 == 1:
            percent -= rand2
        elif rand1 == 2:
            percent += rand2 
        elif rand1 == 3:
            percent -= rand2
        elif rand1 == 4:
            percent += rand2
        elif rand1 == 5:
            percent -= rand2
        elif rand1 == 6:
            percent += rand2
        else:
            print "Something Went Wrong"
        percent = float(percent*.01) + 1.00
        print percent
        population = population*percent
        print "New Population: " + str(int(population))


obj1=populationClass()

while True:
    while True:
        try:
            population = int(raw_input("Population: "))
            if population > 0: break
            else:
                print "Enter a Positive Integer!"
        except ValueError:
            print "Enter a Positive Integer!"

    obj1.populationCount(population)

以下是回溯：

Traceback (most recent call last):
  File "C:\Users\Andrew\Documents\pyscripts\Board Game Syllabus.py", line 116, in <module>
    obj1.populationCount(population)
  File "C:\Users\Andrew\Documents\pyscripts\Board Game Syllabus.py", line 66, in populationCount
    population = population*percent
TypeError: unsupported operand type(s) for *: 'instance' and 'float'

回溯（最近一次呼叫最后一次）：
文件“C:\Users\Andrew\Documents\pyscripts\Board Game Celletus.py”，第116行，在
obj1.人口计数（人口）
文件“C:\Users\Andrew\Documents\pyscripts\Board Game Celletus.py”，第66行，在populationCount中
人口=人口*百分比
TypeError:不支持*：“instance”和“float”的操作数类型

你把

self

和

population

的顺序搞混了：

def populationCount(population, self):    

这应该是：

def populationCount(self, population):    

---

Python仍将以相同的顺序绑定参数，因此在方法中，

population

是

populationClass（）

实例，

self

绑定到调用该方法时传入的

population

值。

在函数populationCount的定义中，请更改以下签名：

def populationCount(self, population): 

Python将调用中传递的参数作为self的实例，即populationClass，因此出现错误。

请包含错误的完整回溯，只需在您的帖子中添加此类详细信息即可。