Create an instance in a class in python

Question

I am trying to create a new instance of a class in Python. I tried the solution here: Instances in python

But it didn't work. So, my main class I have

if __name__ == '__main__':
    Tim = Person
    movement = Person.walk()

Where "Person" is the name of the class that I want to create and instance of. It has methods that I want to use.

I keep getting this error though:

Undefined Variable:Person

I also tried declaring the class instance within the actual metho, not init, but I got the same error.

Any suggestions are welcome. thanks

That's an odd error. Did you import/define Person class properly? Plus you instantiate class by calling it: Person(). — freakish
– freakish, Commented Mar 24, 2014 at 17:17

James Sapam · Accepted Answer · 2014-03-24 17:12:47Z

2

Correction: please use bracket after class if you want to create an instance of that class and use that instance to call the method inside the class.

if __name__ == '__main__':
    Tim = Person()
    movement = Tim.walk()

OR but less recommended

if __name__ == '__main__':
    movement = Person().walk()

answered Mar 24, 2014 at 17:12

James Sapam

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8 Comments

JustBlossom Over a year ago

I am getting the same error. Do the classes have to be in the same file? Maybe that is what is wrong? They are in the same directory, just different files

That1Guy Over a year ago

@Blossom96 You have to import the Person class before you use it.

James Sapam Over a year ago

Yes if the class is not in the same file, then you need to import the module i.e file, where the class is defined.

James Sapam Over a year ago

After you import the module, you can use the class as module.Class()

James Sapam Over a year ago

Could you please read this docs.python.org/2/tutorial/modules.html about how to import module.

|

Farmer Joe · Accepted Answer · 2014-03-24 17:12:47Z

2

You just need to add some parenthesis:

Tim = Person()

This tells python to access the constructor.

The code you provided though tells me you may not have a class Person defined. Your code should have a class Person defined.

class Person:
    def walk(self):
        print "I'm walking!"

if __name__ == "__main__":
    Time = Person
    movement = Person.walk()
    print movement

or you need a call to import the class Person

from my_other_python_file import Person

if __name__ == "__main__":
    Time = Person
    movement = Person.walk()
    print movement

answered Mar 24, 2014 at 17:12

Farmer Joe

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Comments

clcto · Accepted Answer · 2014-03-24 17:12:58Z

0

You need to have parenthesis to call the constructor.

Tim = Person()

As you have it now, Tim = Person is interpreted as assign Tim the value of the variable Person which hasn't been defined.

answered Mar 24, 2014 at 17:12

clcto

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