Python用户数据检查

Question

我有一个程序可以获取用户的输入，然后询问信息是否正确。但是，当用户完成输入信息时，我收到以下代码错误：

#Welcome
print("Welcome to the game!\n")


def data():
    #Age
    age = int(input("Enter your age: "))
    #Gender
    gen = input("Enter your gender: ")
    #email
    mail = input("Enter your email: ")
    #username
    name = input("Enter your name: ")
    return (age, gen, mail, name)

def datacheck():
    print("Your information:\n")
    print("Age: ", age, "\n")
    print("Gender: ", gen, "\n")
    print("Email: ", mail, "\n")
    print("Username: ", name, "\n")
    yn = input("Is it correct? Yes or No: ")
    if yn == "Yes":
        print("Hello, ", name)
    if yn == "No":
        data()
        #Array to variables
        age = data[0]
        gen = data[1]
        mail = data[2]
        name = data[3]
        #datacheck
        datacheck()


data = data()


#Array to Variable.
age = data[0]
gen = data[1]
mail = data[2]
name = data[3]
#datacheck
datacheck()

我得到的错误是：

Traceback（最近一次调用最后一次）：文件 “/Users/joe/Documents/test123.py”，第 48 行，在 datacheck() 文件“/Users/joe/Documents/test123.py”，第 20 行，在 datacheck print("Age: ", age, "\n") UnboundLocalError: 赋值前引用了局部变量'age'

如果我输入没有错误但重新输入信息不起作用：

#Welcome
print("Welcome to the game!\n")


def data():
    #Age
    age = int(input("Enter your age: "))
    #Gender
    gen = input("Enter your gender: ")
    #email
    mail = input("Enter your email: ")
    #username
    name = input("Enter your name: ")
    return (age, gen, mail, name)

def datacheck():
    print("Your information:\n")
    print("Age: ", age, "\n")
    print("Gender: ", gen, "\n")
    print("Email: ", mail, "\n")
    print("Username: ", name, "\n")
    yn = input("Is it correct? Yes or No: ")
    if yn == "Yes":
        print("Hello, ", name)
    if yn == "No":
        data()
        #datacheck
        datacheck()


data = data()


#Array to Variable.
age = data[0]
gen = data[1]
mail = data[2]
name = data[3]
#datacheck
datacheck()

我如何获得它以便用户可以重新输入他们的信息（数据功能）？

Answer 1

您有一个scoping 问题。

此外，我认为您可能想考虑成为object oriented。也就是说，如果我对您使用用户数据的假设是正确的。您可以将用户的属性保存在称为object 的东西中，而不是将用户的属性保存在一堆数组（列表）中。我的意思是，如果您的用户最终拥有 2,000 个属性，您是否需要记住代表他们眼睛颜色的属性编号，以便您可以在列表中引用它？可能不是。哈哈

这种方法可能使您的代码更易于使用/重用，并且在未来更有条理：

class User():
    """A class representing a user.

    defaults set.
    """

    def __init__(self, data={'age': 1,
                             'gender': 'x',
                             'mail': 'user@default',
                             'name': 'User'}):

        self.data = data
        self.age = self.data['age']
        self.gender = self.data['gender']
        self.mail = self.data['mail']
        self.name = self.data['name']

    def __str__(self):
        """The string representation of a User object."""

        return self.name


    def get_age(self):
        """Return the user's age."""

        return self.age

    def get_gender(self):
        """Return the user's gender."""

        return self.gen

    def get_mail(self):
        """Return the user's email address."""

        return self.mail

    def get_name(self):
        """Return the user's name."""

        return self.name

    def get_data(self):
        """Return a dictionary containing a User's info."""

        return self.data

if __name__=="__main__":

    user_data = {} # will contain our data

    # ask for user input
    for key in ["age", "gender", "mail", "name"]:
        user_data[key] = raw_input("Enter your %s: " % key)

    # Store user input data in an object
    user = User(data=user_data)

    print user.get_data() # prints a dictionary containing user values

Answer 2

age, gen, mail, name 在data() 和datacheck() 中都是local variables，这些变量scope 是它们所属的方法。您必须将这些变量定义为global，或者将变量/元组对象从一种方法传递给另一种方法。

根据你的逻辑，你需要将你的元组对象传入datacheck()，修改为datacheck(tuple)，我测试如下：

hzhang@dell-work ~/PycharmProjects/Test $ cat test.py 
#Welcome
print("Welcome to the game!\n")


def data():
    #Age
    age = int(input("Enter your age: "))
    #Gender
    gen = input("Enter your gender: ")
    #email
    mail = input("Enter your email: ")
    #username
    name = input("Enter your name: ")
    return (age, gen, mail, name)


def datacheck(data):
    age = data[0]
    gen = data[1]
    mail = data[2]
    name = data[3]

    print("Your information:\n")
    print("Age: ", age, "\n")
    print("Gender: ", gen, "\n")
    print("Email: ", mail, "\n")
    print("Username: ", name, "\n")
    yn = input("Is it correct? Yes or No: ")
    if yn == "Yes":
        print("Hello, ", name)
    if yn == "No":
        values = data()
        #datacheck
        datacheck(values)


data = data()

#Array to Variable.
age = data[0]
gen = data[1]
mail = data[2]
name = data[3]
#datacheck
datacheck(data)hzhang@dell-work ~/PycharmProjects/Test $ python test.py 
Welcome to the game!

Enter your age: 22
Enter your gender: "male"
Enter your email: "hi@email.com"
Enter your name: "haifzhan"
Your information:

('Age: ', 22, '\n')
('Gender: ', 'male', '\n')
('Email: ', 'hi@email.com', '\n')
('Username: ', 'haifzhan', '\n')
Is it correct? Yes or No: "Yes" 
('Hello, ', 'haifzhan')

Answer 3

您的变量不是全局变量，您需要将它们传递给函数或将它们声明为全局变量。

还应使用 raw_input 而不是字符串的输入，如下所述：Python 2.7 getting user input and manipulating as string without quotations

#Welcome
print("Welcome to the game!\n")


def data():
    #Age
    age = raw_input(input("Enter your age: "))
    #Gender
    gen = raw_input("Enter your gender: ")
    #email
    mail = raw_input("Enter your email: ")
    #username
    name = raw_input("Enter your name: ")
    return (age, gen, mail, name)

def datacheck(age, gen, mail, name):
    print("Your information:\n")
    print("Age: ", age, "\n")
    print("Gender: ", gen, "\n")
    print("Email: ", mail, "\n")
    print("Username: ", name, "\n")
    yn = raw_input("Is it correct? Yes or No: ")
    if yn == "Yes":
        print("Hello, ", name)
    if yn == "No":
        data()
        #datacheck
        datacheck(age, gen, mail, name)


data = data()


#Array to Variable.
age = data[0]
gen = data[1]
mail = data[2]
name = data[3]
#datacheck
datacheck(age, gen, mail, name)

为我工作。

Answer 4

在尝试使用它们之前，您需要将变量从第一个函数传递到第二个函数

#Welcome
print("Welcome to the game!\n")


def data():
    age = int(input("Enter your age: "))
    gen = str(input("Enter your gender: "))
    mail = str(input("Enter your email: "))
    name = str(input("Enter your name: "))
    return (age, gen, mail, name)

def datacheck():
    age, gen, mail, name = data()
    print("Your information:\n")
    print("Age: %s\n"%(age))
    print("Gender: %s\n"%(gen))
    print("Email: %s\n"%(mail))
    print("Username: %s\n"%(name))
    yn = input("Is it correct? Yes or No: ")
    if yn == "Yes":
        print("Hello, ", name)
    if yn == "No":
        datacheck()

#datacheck
datacheck()