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   源码介绍

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本实例为用python语言编写，以python的面向对象、列表、局部变量等部分知识为基础，内容类似于popcap的植物大战僵尸的游戏项目

本实例为UC berkeley课程CS61A的project，代码框架由CS61A课程提供，其余部分由上传者独立完成，详见https://inst.eecs.berkeley.edu/~cs61a/sp18/proj/ants/

class Insect(object):
    """An Insect, the base class of Ant and Bee, has armor and a Place."""

    is_ant = False
    damage = 0
    watersafe = False

    def __init__(self, armor, place=None):
        """Create an Insect with an ARMOR amount and a starting PLACE."""
        self.armor = armor
        self.place = place  # set by Place.add_insect and Place.remove_insect

    def reduce_armor(self, amount):
        """Reduce armor by AMOUNT, and remove the insect from its place if it
        has no armor remaining.

        >>> test_insect = Insect(5)
        >>> test_insect.reduce_armor(2)
        >>> test_insect.armor
        3
        """
        self.armor -= amount
        if self.armor <= 0:
            self.place.remove_insect(self)

    def action(self, colony):
        """The action performed each turn.

        colony -- The AntColony, used to access game state information.
        """

    def __repr__(self):
        cname = type(self).__name__
        return '{0}({1}, {2})'.format(cname, self.armor, self.place)


class Bee(Insect):
    """A Bee moves from place to place, following exits and stinging ants."""

    name = 'Bee'
    damage = 1
    watersafe = True

    def sting(self, ant):
        """Attack an ANT, reducing its armor by 1."""
        ant.reduce_armor(self.damage)

    def move_to(self, place):
        """Move from the Bee's current Place to a new PLACE."""
        self.place.remove_insect(self)
        place.add_insect(self)

    def blocked(self):
        """Return True if this Bee cannot advance to the next Place."""
        # Phase 4: Special handling for NinjaAnt
        # BEGIN Problem 7
        return (self.place.ant is not None) and self.place.ant.blocks_path
        # END Problem 7

    def action(self, colony):
        """A Bee's action stings the Ant that blocks its exit if it is blocked,
        or moves to the exit of its current place otherwise.

        colony -- The AntColony, used to access game state information.
        """
        if self.blocked():
            self.sting(self.place.ant)
        elif self.armor > 0 and self.place.exit is not None:
            self.move_to(self.place.exit)


class Ant(Insect):
    """An Ant occupies a place and does work for the colony."""

    is_ant = True
    implemented = False  # Only implemented Ant classes should be instantiated
    food_cost = 0
    blocks_path = True
    container = False

    def __init__(self, armor=1):
        """Create an Ant with an ARMOR quantity."""
        Insect.__init__(self, armor)

    def can_contain(self, other):
        # BEGIN Problem 9
        "*** YOUR CODE HERE ***"
        if self.container and not other.container and self.ant==None:
            return True
        return False
        # END Problem 9