所以，基本上我的代碼在打印我希望它打印的語句后打印 None 。我怎樣才能阻止這個 None 打印class Panda: def __init__(self,name,gender,age): self.name=name self.gender=gender self.age=age def sleep(self,time=None): self.time=time if self.time!=None: if self.time>=3 and self.time<=5: self.food='Mixed Veggies' if self.time>=6 and self.time<=8: self.food='Eggplant & Tofu' if self.time>=9 and self.time<=11: self.food='Broccoli Chicken' print('{} sleeps {} hours daily and should have {}'.format(self.name,self.time,self.food)) else: print("{}'s duration is unknown thus should have only bamboo leaves".format(self.name))panda1=Panda("Kunfu","Male", 5)panda2=Panda("Pan Pan","Female",3)panda3=Panda("Ming Ming","Female",8)print(panda2.sleep(10))print(panda1.sleep(4))print(panda3.sleep())
2 回答
慕斯709654
TA貢獻1840條經驗 獲得超5個贊
該print函數在 Python 中不返回，它只是寫入stdout; 因此，當您調用sleep實例的方法時，它只會打印None.
要解決這個問題，您要做的就是要么return不打印sleep，要么直接調用它而不將其包含在print語句中。
結果會是這樣的，例如：
class Panda:
def __init__(self,name,gender,age):
self.name=name
self.gender=gender
self.age=age
def sleep(self,time=None):
self.time=time
if self.time!=None:
if self.time>=3 and self.time<=5:
self.food='Mixed Veggies'
if self.time>=6 and self.time<=8:
self.food='Eggplant & Tofu'
if self.time>=9 and self.time<=11:
self.food='Broccoli Chicken'
return '{} sleeps {} hours daily and should have {}'.format(self.name,self.time,self.food)
else:
return "{}'s duration is unknown thus should have only bamboo leaves".format(self.name)
panda1=Panda("Kunfu","Male", 5)
panda2=Panda("Pan Pan","Female",3)
panda3=Panda("Ming Ming","Female",8)
print(panda2.sleep(10))
print(panda1.sleep(4))
print(panda3.sleep())
或者
class Panda:
def __init__(self,name,gender,age):
self.name=name
self.gender=gender
self.age=age
def sleep(self,time=None):
self.time=time
if self.time!=None:
if self.time>=3 and self.time<=5:
self.food='Mixed Veggies'
if self.time>=6 and self.time<=8:
self.food='Eggplant & Tofu'
if self.time>=9 and self.time<=11:
self.food='Broccoli Chicken'
print('{} sleeps {} hours daily and should have {}'.format(self.name,self.time,self.food))
else:
print("{}'s duration is unknown thus should have only bamboo leaves".format(self.name))
panda1=Panda("Kunfu","Male", 5)
panda2=Panda("Pan Pan","Female",3)
panda3=Panda("Ming Ming","Female",8)
panda2.sleep(10)
panda1.sleep(4)
panda3.sleep()
蝴蝶不菲
TA貢獻1810條經驗 獲得超4個贊
所以第一個打印語句是由于方法print中的函數造成的sleep。正在None按您的方式打印print(panda1.sleep())。該sleep方法不返回任何內容，因此None.
要擺脫None，您可以簡單地使用panda1.sleep()而不是print(panda1.sleep())。
但是，更好的選擇可能是返回您希望函數打印的消息sleep，然后使用print(panda1.sleep())
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