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python – 太空飞船的对象
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我正在尝试创建一个创建宇宙飞船的程序,我正在使用status()方法来显示船名和燃料值.但是,它似乎没有起作用.我想我可能用status()方法搞砸了.我也试图这样做,以便我可以改变燃料值,但我不想创建一个新的方法来做到这一点.我想我在某处发生了一次可怕的错误转弯.请帮忙!
class Ship(object):
def __init__(self, name="Enterprise", fuel=0):
self.name=name
self.fuel=fuel
print "The spaceship", name, "has arrived!"
def status():
print "Name: ", self.name
print "Fuel level: ", self.fuel
status=staticmethod(status)
def main():
ship1=Ship(raw_input("What would you like to name this ship?"))
fuel_level=raw_input("How much fuel does this ship have?")
if fuel_level<0:
self.fuel=0
else:
self.fuel(fuel_level)
ship2=Ship(raw_input("What would you like to name this ship?"))
fuel_level2=raw_input("How much fuel does this ship have?")
if fuel_level2<0:
self.fuel=0
else:
self.fuel(fuel_level2)
ship3=Ship(raw_input("What would you like to name this ship?"))
fuel_level3=raw_input("How much fuel does this ship have?")
if fuel_level3<0:
self.fuel=0
else:
self.fuel(fuel_level3)
Ship.status()
main()
raw_input("Press enter to exit.")
解决方法:
每艘船都有自己的燃料,所以静电是不可能的.如果您不希望参数看起来像方法,请考虑属性.它还包含了燃料的价值检查.
class Ship(object):
def __init__(self, name="Enterprise", fuel=0):
self.name = name
self._fuel = fuel
print "The spaceship", name, "has arrived!"
def status(self):
print "Name: ", self.name
print "Fuel level: ", self.fuel
@property
def fuel(self):
return self._fuel
@fuel.setter
def fuel(self,level):
if level < 0:
self._fuel = 0
else:
self._fuel = level
在main()中,考虑循环来初始化船只并显示状态而不是重复代码,并使用ship.fuel而不是self.fuel. self仅在类的方法中有效.
def main():
ships = []
for n in range(4):
ship = Ship(raw_input("What would you like to name this ship?"))
ship.fuel = int(raw_input("How much fuel does this ship have?"))
ships.append(ship)
for ship in ships:
ship.status()
main()
raw_input("Press enter to exit.")
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