python提取列表中的数字_python如何提取列表中的数字？

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其实那个list 是从一个txt中读取的数据，一个有4个数字。分别是RABBIT_BIRTH_RATE, FOX_BIRTH_RATE, INTERACT, SUCCESS, 他们应该等于什么，才能进行后面的运算？

作业还要求导出一个txt,把结论写进去

我的完整代码：

def main():

rabbits = int(input("\nPlease enter the initial rabbit population: "))

foxes = int(input("Please enter the initial foxes population: "))

num_days = int(input("Please enter the number of days to run the simulation: "))

fre_days = int(input("Please enter the frequency of days for displaying data: "))

filename = input("Please enter filename to store results: ")

print("Simulation Finished - resultdata written to", filename)

values=[]

with open('initvals.txt','r') as f:

for line in f:

values.append(list(map(float,line.split())))

RABBIT_BIRTH_RATE = ?这里填啥？

FOX_BIRTH_RATE = ?填啥？

INTERACT = ?填啥？

SUCCESS = ?填啥？

for i in range(num_days):

changeRabbits = (RABBIT_BIRTH_RATE * rabbits - INTERACT * rabbits * foxes)

changeFoxes = (INTERACT * SUCCESS * rabbits * foxes - FOX_BIRTH_RATE * foxes)

rabbits = rabbits + changeRabbits

foxes = foxes + changeFoxes

listrabbits=[]

listfoxes=[]

listrabbits.append(rabbits)

listfoxes.append(foxes)

rabbitsaverages = sum(listrabbits)/len(listrabbits)

foxessaverages = sum(listfoxes)/len(listfoxes)

import math

a = math.floor((num_days)/(fre_days))

f = open(filename, 'w')

f.write("Day, Foxes, Rabbits, AverageFoxes, Average Rabbits\n")

f.write(fre_days* i， 填啥？？？？？？

f.close()

main()