Regarding classes in python

Question

I have basic question about python classes. I would like to access
a class member defined in one python file across different files. Here is my code:

I have one python file class_A.py:

class A:
def Hello(self):
 self.a=12
 print "printing A value from class_1",self.a

Here is the code of class_B.py file

import Class_A
def func_B():
 Instance = Class_A.A()
 Instance.Hello()
func_B()

When I execute, it shows:

TypeError: Hello() takes no arguments (1 given).

Basically what I'm trying to do is accessing class members defined in class_A.py
by creating an instance to that class inside the function func_B which is defined
in another python file Class_B.py. Is this right?

• eandersson: There is nothing wrong with the code you posted. Do you have any additional code in your class_B.py file?
• MrHug: Not sure if it is the layout of the question or your actual python layout, but I think you need to indent the def Hello(self): and the body one more time to make sure they are part of the class A :)
• class stacker: I think you may actually not define classes at all. In python, it's not the case that a defined method becomes a class member just because of a file name. Please post your full code, properly formatted.
• Zangetsu: def Hello(self): should be indented to be inside class A
• user2032433: This is not your actual code. If the method Hello is indented, it works. If it's not, you'll get an error that class A is empty (no pass).

Answer 1

I think your problem is with the indentation in the class A:

class A:
 def Hello(self):
 self.a = 12
 print "printing A value from class_1", self.a

Aside: Take a look a the PEP8 style guide.

• eandersson: Ah, expected that it could be a indent issue, but seriously you never know here on stack as people always fail to format their code.