Python 父类构建函数中字段，赋值等于子类中属性时；报错问题
在群里下载XX Python培训机构的PDF，里面有一段小游戏代码；本着菜鸟，努力码代码的心态。结果运行时报错，提示：#!/usr/bin/env python
# coding=utf-8
class unit:
def __init__(self):
self.___blood_max =self.___blood
print self.name + " created"
class attacker(unit):
def attack(self,u):
u.__blood -= self.dps
if u.__blood <= 0:
print u.name + " was dead!!!"
del u
else:
print u.name + " was attacked !__blood = " + str(u.__blood)
class machineGun(attacker):
def __init__(self,name):
self.__blood = 100
self.name = name
unit.__init__(self)
self.dps = 30
print self.name + " Created"
class tree(unit):
def __init__(self,name):
self.name = name
print self.name + " Created"
class healer(unit):
def __init__(self,name):
self.__blood = 50
self.name = name
unit.__init__(self)
self.hps = 15
print self.name + " Created"
def heal(self,u):
u.__blood += self.hps
if u.__blood >= u.__blood_max:
u.__blood = u.__blood_max
print u.name + "was healed ! __blood = " +str(u.__blood)
j1 = machineGun("j1")
j2 = machineGun("j2")
h1 = healer("h1")
j1.attack(j2)
j1.attack(j2)
h1.heal(j2)
j1.attack(j2)
j1.attack(j2)
j1.attack(j2)
错误如下：
Traceback (most recent call last):
File "C:\Users\Cranezhou\workspace\test\test01\game.py", line 50, in <module>
j1 = machineGun("j1")
File "C:\Users\Cranezhou\workspace\test\test01\game.py", line 25, in __init__
unit.__init__(self)
File "C:\Users\Cranezhou\workspace\test\test01\game.py", line 7, in __init__
self.___blood_max =self.___blood
AttributeError: machineGun instance has no attribute '_unit___blood'
后经在XX培训群，咨询大神；说__开头的变量，在Python后来的版本中定义有变动。替换为一个下划分线后，程序总算可以运行了。
后经再次查看eclipe debug，想起__开头的变量是私有变量；父类构建函数中字段，赋值等于子类中属性时，找不到相对应的属性，实属正常。
后续：测试，子类 能不能引用 父类中的私有变量？
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