為什么我的遞歸python函數不返回？我有一個叫做自己的函數：def get_input():
my_var = input('Enter "a" or "b": ')
if my_var != "a" and my_var != "b":
print('You didn\'t type "a" or "b". Try again.')
get_input()
else:
return my_varprint('got input:', get_input())現在，如果我只輸入“a”或“b”，一切正常：Type "a" or "b": a
got input: a但是，如果我鍵入其他內容，然后再輸入“a”或“b”，我就會得到以下內容：Type "a" or "b": purple
You didn't type "a" or "b". Try again.
Type "a" or "b": a
got input: None我也不知道原因get_input()正在回歸None，因為它只應該返回my_var。這個在哪里？None我是從哪里來的，我該如何修復我的功能？
4 回答
蝴蝶不菲
TA貢獻1810條經驗 獲得超4個贊
None
if my_var != "a" and my_var != "b":
print('You didn\'t type "a" or "b". Try again.')
get_input()None
>>> def f(x):... pass>>> print(f(20))None
get_input()ifreturn
if my_var != "a" and my_var != "b":
print('You didn\'t type "a" or "b". Try again.')
return get_input()
汪汪一只貓
TA貢獻1898條經驗 獲得超8個贊
慕絲7291255
TA貢獻1859條經驗 獲得超6個贊
def get_input():
my_var = input('Enter "a" or "b": ')
if my_var != "a" and my_var != "b":
print('You didn\'t type "a" or "b". Try again.')
return get_input()
else:
return my_varprint('got input:', get_input())
波斯汪
TA貢獻1811條經驗 獲得超4個贊
if my_var != "a" and my_var != "b":
print('You didn\'t type "a" or "b". Try again.')
get_input()get_input
else: return my_var
print('got input:', get_input())while my_var!="a" and my_var!="b":
print('You didn\'t type "a" or "b". Try again.')
return get_input()添加回答
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