Why is Python 2 input() giving me 'NameError: name "____" is not defined'?

Question

我正在尝试编写一个函数来询问姓名、姓氏和出生年份。此外，它稍后会打印出姓名首字母和年龄。

首先，它不要求任何东西。

其次，无论我输入什么都将打印错误：

NameError: name "____"  is not defined.

我正在使用 Python 3.

代码如下：

def userinfo():
    name_ = input("Enter your first name: ")
    last_ = input("Enter your last name: ")
    year_ = input("Enter your year: ")
    initials_ = name_[0] + last_[0]
    age_ = (2018 - year_)
    _info = ("Your initials are ") + (initials_) + (" and you are ") + (str(age_)) + (" years old.")
    if (len(name_) > 0 and len(last_) > 0 and len(year_) > 0 and name_.isalpha() and last_.isalpha()):
        return (_info)
    else:
        return ("Error")

Answer 1

这似乎是从 main() 的声明中抛出的。

检查 main 函数是否使用了双下划线 ( __ ) 或三下划线 ( ___ )。

正确的语法是if __name__ == '__main__':

希望对您有所帮助！干杯!

Answer 2

这是经过一些更正的更正代码：

1) 将 input 替换为 raw_input（假设您使用的是 python 2.***）。如果您使用的是版本 3+，则将 raw_input 替换为 input。

2) 在计算年龄时将 year_ 替换为 int(year_)，因为用户输入的类型是 str。

def userinfo():
    name_ = raw_input("Enter your first name: ")
    last_ = raw_input("Enter your last name: ")
    year_ = raw_input("Enter your year: ")
    print (name_)
    initials_ = name_[0] + last_[0]
    age_ = (2018 - int(year_))  # Correction here
    _info = ("Your initials are ") + (initials_) + (" and you are ") + (str(age_)) + (" years old.")
    if (len(name_) > 0 and len(last_) > 0 and len(year_) > 0 and name_.isalpha() and last_.isalpha()):
        return (_info)
    else:
        return ("Error") 

userinfo()

输出

Enter your first name: Donald
Enter your last name: Trump
Enter your year: 1950
Donald
'Your initials are DT and you are 68 years old.'

Why is Python 2 input() giving me 'NameError: name "____" is not defined'?

Why is Python 2 input() giving me 'NameError: name "____" is not defined'?

python

input

python-2.x