attribute error instead of correct output

[MaartenRo]

Hi,

When running this code i should get " Hallo Zelda" but instead i get an error message. What am i doing wrong?

Any input is much appreciated!

>>> class MyClass:
    Greeting = ""
    
>>> def SayHello(self):
    print("Hallo {0}".format(self.Greeting))
    
>>> MyClass.Greeting = "Zelda" 
>>> MyClass.Greeting
'Zelda'
>>> MyInstance = MyClass()
>>> MyInstance.SayHello()
Traceback (most recent call last):
  File "<pyshell>", line 1, in <module>
AttributeError: 'MyClass' object has no attribute 'SayHello'
>>> 

[deanhystad]

You need to indent. Also the interpreter is thinking you are done defining class when press <enter> after an empty line. If you want to write classes use the file editor, not the shell.

[Larz60+]

In your code, def SayHello is not indented (and must be)
this is a difficult code to write interactively, a better example (using a script file) below (includes a default greeting)

MyClass.py:

class MyClass:
    def __init__(self, greeting='there'):
        self.greeting = greeting

    def say_hello(self):
        print(f"Hello {self.greeting}")

def main():
    myinstance = MyClass()
    myinstance.say_hello()
    myinstance.greeting = 'Zelda'
    myinstance.say_hello()

if __name__ == '__main__':
    main()

Output:
Hello there

Hello Zelda