CODEWITHSUNDEEP
pythoneclipseconsolepydev
Tharindu Rusira
Tharindu Rusira

Reputation: 691

print to console in PyDev

I'm a newbie to PyDev in Eclipse. When coding simple programs, I use print() statements regularly in order to track the values of variables. I want these values to be printed to the console but I couldn't get any value printed in the console so far.

Here's a simple piece of code to demonstrate what I'm trying to do.

class MyClass(object):

  def __init__(self):

    myClassObject= MyClass()
    myClassObject.greet()


    def greet(self):
       print("stackoverflow is the best !!!")

I'm expecting to see the string "stackoverflow is the best !!!" in the console but when I run the code I get nothing at all. What am I supposed to do?

Thanks in advance

Upvotes: 2

Views: 7790

Answers (3)

Tharindu Rusira
Tharindu Rusira

Reputation: 691

I just learnt that my code portion in the question was meaningless because I have instantiated the objects in __init__(self). So the object has to be created inside a if __name__ == '__main__': instead.

I have written a complete module to demonstrate this. (Observe there are multiple classes in Classes.py module and then it is imported in the second part of the code)

'''
Classes.py
'''


class MyClass(object):  


    def greet(self):
        print("Hello World")


class MyNextClass(object):

        def greetAgain(self):
            print("Hello again")

'''
MyMain.py
'''
import Classes

if __name__ == '__main__':

    a=Classes.MyClass()
    a.greet()

    b=Classes.MyNextClass();
    b.greetAgain()

The above code makes sense and it will output to the console without problems.

Upvotes: 0

John Percival Hackworth
John Percival Hackworth

Reputation: 11531

You have not instantiated the class. In order to produce output from what you've got try the following:

if __name__ == '__main__':
  instance = MyClass()

-- REVISED --

In light of your rewritten code, you should have the following:

class MyClass(object):
    def __init__(self):
        #myClassObject= MyClass() # Causes recursion error.
        #myClassObject.greet() # You should not be accessing your instance method this way
        self.greet()


    def greet(self):
        print("stackoverflow is the best !!!")

if __name__ == '__main__':
    instance = MyClass()

Your example appears to be overly complicated. You would do well to review class usage in Python for Python 2.7 or Python 3.3.

Upvotes: 2

Matthieu
Matthieu

Reputation: 4711

__init__ is called when the class is instantiated (cf. this question). Adding my_instance = MyClass() at the end of your snippet will create an instance of the MyClass class and should print out what you want:

class MyClass(object):

  def __init__(self):
    print("stackoverflow is the best !!!")

my_instance = MyClass()

Upvotes: 0

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