[英]Python recursive function
def bunnies(n,months,quantity):
print(quantity)
if n == months:
return quantity
else:
quantity=quantity+quantity
bunnies(n+1,months,quantity)
months=int(input("How many months ?"))
quantity=1
n=0
bunnies_total=bunnies(n,months,quantity)
print(bunnies_total)
For some reason my function returns None
, I can't figure it out. 由于某种原因,我的函数返回None
,我无法弄清楚。
Your else
branch doesn't return anything, which means in python it will just return None
. 您的else
分支不会返回任何内容,这意味着在python中它将仅返回None
。 Slap a return
on the call to bunnies
, and you should be OK: 巴掌return
上调用bunnies
,你应该确定:
def bunnies(n,months,quantity):
if n == months:
return quantity
else:
quantity=quantity+quantity
return bunnies(n+1,months,quantity) # Here
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