我不明白为什么我以后不能使用user\u选项，因为它“未定义”

Question

def user_input():
    x = input("Choose :Charizard, Blastoise, or Venusaur: ")
    if x in "char":
        user_choice = "Charizard"
    elif x in "blast":
        user_choice = "Blastoise"
    elif x in "ven":
        user_choice = "Venusaur"
    return user_choice


user_input()

print(user_choice)

erorr=NameError:未定义名称“用户选择”

我想稍后使用user_选项

Answer 1

如果你问为什么不给user_choice一个None的值，那是因为你从来没有定义过user_choice如果那些If语句都不是真的

您希望您的代码更像这样。您的代码中有多个错误，我已全部修复

def user_input():
    user_choice = "" # Defined user_choice before taking the input
    x = input("Choose :Charizard, Blastoise, or Venusaur: ")
    if "char" in x:
        user_choice = "Charizard"
    elif "blast" in x:
        user_choice = "Blastoise"
    elif "ven" in x:
        user_choice = "Venusaur"
    return user_choice


print(user_input()) # This prints the value of the object returned by the function