Python3中的名称定义错误

Question

我在spyder中试图运行一个相当简单的python代码（python3.6.4），但是当我运行代码并使用input语句时，它说名称没有被定义，即使它们应该被定义。在

#Module 4 project
#4/25/18
#Henry Degner
#This project is meant to determine whether or not certain people are qualified to go to an exclusive concert

#create function askAge, which will use an input statement and comparison operators to see if the user is old enough
def askAge():
    age = int(input("How old are you? "))
    if( age >= 18 ):
        ageReq = "true"
    elif( age < 18 ):
        ageReq = "false"
    else:
        print("Please print you're age with only numerical characters, in years")
        age = int(input("How old are you? "))
#create function askHearing, yes or no question to do you have sensitive hearing
def askHearing():
    hearing = str(input("Do you have sensitive hearing? "))
    if( str(hearing) == "yes","y" ):
        hearingReq = "do"
    elif( str(hearing) == "no","n"):
        hearingReq = "don't"
    else:
        print("Please type yes, or y, if you have sensitivehearing. If not, type no or n.")
        hearing = str(input("Do you have sensitive hearing? "))
#create function askTicket, yes or no question to do you have a ticket
def askTicket():
    ticket = str(input("Do you have a ticket for the concert? "))
    if( str(ticket) == "yes","y" ):
        ticketReq = "do"
    elif( str(ticket) == "no","n"):
        ticketReq = "don't"
    else:
        print("Please type yes if you have a ticket, or no if you don't.")
        ticketReq = str(input("Do you have a ticket for the concert"))
#create function askFun, yes or no question to are you willing to have an awesome time
def askFun():
    fun = str(input("Are you willing to have a great time?"))
    if( str(fun) == "yes","y"):
        funReq = "do"
    elif( str(fun) == "no","n" ):
        funReq = "don't"
    else:
        print("Please type 'yes' or 'no'")
        fun = str(input("Are you willing to have a great time?"))
#use def main():
def main():
#print situation, will ask some questions to see if you can attend concert
    print("Welcome to the Henry Degner Concert Venue! We have to ask you a few questions before we let you into the venue.")
#use askAge
    askAge()
#use askHearing
    askHearing()
#use askTicket
    askTicket()
#use askFun
    askFun()
#print user's answers
    print("You said you are " + age + " years old, you " + hearingReq + " have sensitive hearing, you " + ticketReq + " have a ticket, and you " + funReq + " want to have a great time!")
#use if-else statement, if all three conditions match requirements, print you can attend concert. If not, print you can't attend

#use main()
main()

错误输出为

^{pr2}$

它还表示第60行中的所有其他名称都没有定义。提前谢谢！在

Answer 1

您得到的是NameError: name 'age' is not defined，因为不同函数的变量在声明为全局变量或从一个方法返回到另一个方法之前是不共享的。在

阅读更多关于Python Scopes and Namespaces

只需将值从函数返回到主方法。在

从方法返回值

def askAge():
    age = int(input("How old are you? "))
    if( age >= 18 ):
        ageReq = "true"
    elif( age < 18 ):
        ageReq = "false"
    else:
        print("Please print you're age with only numerical characters, in years")
        age = int(input("How old are you? "))

    return age

def main():
    ...
    age = askAge()
    .....

同样，你需要对所有方法都这么做

^{pr2}$