遍历List和删除某些元素

问题描述

限时删除！！

我的工作在我的电脑类的任务，而我有一个很难用code的一个部分。我会发布作业准则（粗体部分是我遇到的问题code）：

This is my code:

import random

class Colony(object):

    def __init__(self):
        Colony.food = 10
        Colony.numWorkerAnts = 0
        Colony.workerAnts = []

     def breedWorker(self):
         print ("Breeding worker...")
         Colony.numWorkerAnts += 1
         Colony.food -= 5
         Colony.workerAnts.append(1)
         if (Colony.food < 5):
            print ("Sorry, you do not have enough food to breed a new worker ant!")

     def step(self):
         for i in range(0,len(Colony.workerAnts)):
            Colony.food -= 1

class Ant(object):

    def __init__self(self):
    Ant.health = 10

    def forage(self):
    foodFound = random.random()
    if (foodFound <= 0.05):
       print("Ant has died in an accident!")
       Ant.health = 0
    if (foodFound > 0.05 and foodFound < 0.40):
       amountFood = random.randint(1,5)
       print("Ant finds "+str(amountFood)+" food.")
       Colony.food += amountFood
    if (foodFound >= 0.40 and foodFound < 0.95):
       print("Ant worker returns empty handed.")
    if (foodFound >= 0.95):
       print("Your ant finds sweet nectar! Ant returns "+str(amountFood)+" to the colony and health is restored to "+str(self.health)+"!")
       amountFood = 10
       Ant.health = 10
       Colony.food = amountFood + Colony.food

def main():
    colony = Colony()
    ant = Ant()
    while (Colony.numWorkerAnts >= 1 or Colony.food >= 5):
    print ("Your colony has "+str(Colony.numWorkerAnts)+" ants and "+str(Colony.food)+" food, Your Majesty.")
    print ("What would you like to do?")
    print ("0. Do nothing")
    print ("1. Breed worker (costs 5 food)")
    prompt = '> '
    choice = int(raw_input(prompt))

    if (choice == 1):
        colony.breedWorker()
        colony.step()
        for i in range(0, len(Colony.workerAnts)):
            ant.forage()
    else:
        for i in range(0, len(Colony.workerAnts)):
            ant.forage()
            colony.step()
main()

解决方案

At the moment, you are making everything a class attribute, shared amongst all instances of the class, as you use ClassName.attr. Instead, you should use the self.attr to make everything an instance attribute:

class Colony(object):

    def __init__(self):
        self.food = 10
        self.workerAnts = [] # numWorkerAnts is just len(workerAnts)

Note that you should alter breedWorker to actually add a new Ant instance to the list of self.workerAnts; at the moment, it only increments the count.

To reduce the colony to ants with health, you can use a list comprehension:

self.workerAnts = [ant for ant in self.workerAnts if ant.health]

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