input throwing error when running python program

Question

I am very new to python and trying to run a basic program. I am asking for input (name) from user. And when user enters the name, the program is throwing and error. Here is my program

class Student:

    def __init__(self, name, age):
        self.name = name
        self.age = age

    def get_data(self):
        self.name = input("please enter name")
        self.age = input("now age")

    def print_data(self):
        print self.name
        print self.age


ajeet = Student("", "")

ajeet.get_data()

ajeet.print_data()

And below is the error

please enter name Apurv
Traceback (most recent call last):
  File "/Users/apurvgandhwani/PycharmProjects/bio/AgeClass.py", line 18, in <module>
    ajeet.get_data()
  File "/Users/apurvgandhwani/PycharmProjects/bio/AgeClass.py", line 8, in get_data
    self.name = input("please enter name")
  File "<string>", line 1, in <module>
NameError: name 'Apurv' is not defined

Python version my system is using is 2.7.15

I have tried to look into the issue and from what I have read it is the python version issue. I aam supposed to use 3.x version. I installed python3 in my mac. But system is still using the old version. How am I supposed to run the program or change the python version to 3.x.

To change the python version, I have tried adding alias to the bash_profile as

alias python = 'python3'

But still there is the same error coming when I run the my program. How can I solve this?

Answer 1

Probably because you're not loading the .bash_profile . Try this

source ~/.bash_profile

Also to avert this error in python2 change your input to raw_input which accepts strings.

Answer 2

The print lines should be enclosed in a pair of parentheses after print in Python 3 like this: print() . Otherwise you will get an error message that says: Missing parentheses in call to 'print'

Also when you enter a name in def get_data(self) the name is a string so you should either use the str() function in self.name = str(input("Please enter name: ")) to turn the input name into a string or else enclose the input name in a pair of quotes to make the input name a string that way. That is how to fix the error message: NameError: name 'Apurv' is not defined when you try to enter Apurv after where it says please enter name .

class Student:
    def __init__(self, name, age):
        self.name = name
        self.age = age

    def get_data(self):
        self.name = str(input("Please enter name: "))
        self.age = input("Please enter age: ")

    def print_data(self):
        print(self.name)
        print(self.age)  

ajeet = Student("", "")
ajeet.get_data()
ajeet.print_data()