I am trying to run the python script in my command prompt and the following error is showing:
Traceback (most recent call last):
File "Linear.py", line 14, in
class simpleMultiLinkTopo( Topo ):
File "Linear.py", line 21, in simpleMultiLinkTopo
s1 = self.addSwitch( 's1' )
NameError: name 'self' is not defined
Can anyone tell me the solution?
Try removing for loop and running the self.addLink lines as is.
The loop is ran only once so you don't really need it.
If you insist on using it, you should indent it by 8 spaces so that the interpreter knows it's a part of the class's __init__ metod.
It looks like you copied that part of the code from another class.
In Python, by convention (PEP 8), "self" refers to the current instance of an object. If your code is outside of a class, self will not be defined, as there is no instance.
Ilia Bagov I have tried but didn't work, do you have any more suggestion?
Btw thanks for your concern.
Mohammad Hossein Ataie Can you please tell me which section of my code should be replaced? It would be helpful for me if you can just pin point the section for be.
You are calling some undefined functions AddHost(), AddLink(), AddSwitch() in the class. I don't know extactly what they are. The self keyword refers to the current class. So, you have to define the functions in the class if they are not library functions. Otherwiese, you need to refer the functions properly (e.g. use library name instead of keyword self).
Md. Kamrul Islam Thanks a lot sir, I have solved the problem. AddHost(), AddLink(), AddSwitch() are the functions to create topology in SDN. Keep me in your prayers.
It's going to be easier for you to code if you employ more powerful & user friendly programing tools, instead of just using directly the command prompt; take a look to PyCharm, Atom and Google Colab, it can be less painful to debug a code with the aid of these tools.
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