Method not defined

[diskt]

Hello,
i have been playing around with the following piece of code that i found in an online course of Python.
The class has 2 methods, one method is calling the other.
I can make it work if i use the class name in the zoo().
Currently as it is, it can execute without any errors.
If i remove the comments is providing me the following errors,according to the line in use, can someone explain me why please?

class TestClass:
	def foo(left,stop):
		pass

	def zoo(left):
		foo(left,True)
		foo(left,False)


obj1=TestClass()
obj1.foo('left')
#obj1.zoo('left') #TypeError: zoo() takes 1 positional argument but 2 were given
#obj1.zoo() #NameError: name 'foo' is not defined

Thank you

[noisefloor]

Hi,

i don't know which tutorial you got the code from, but it's wrong. The 1st positional argument of methods in a class have to be self, that's by convention for self-referencing the class. The self-reference is in the end also the reason for the error you get.

I'd recommend to read through the section on class in the official Python tutorial at docs.python.org to get a better understand of how classes work and how to write them.

Regards, noisefloor