Question

if I declare a const class which are contains variables:

for example

class const:
    MASTER_CLIENT_CONNECTED = 0
    CLIENT_CONNECTED = 1        
    GET_SERVER_QUEUE = 9998    
    ERROR = 9999

is there any way to reach this variable(constants) without creating a new class.

like this:

import const
const.MASTER_CLIENT_CONNECTED 

or

import const
if(i==MASTER_CLIENT_CONNECTED):

Answer 1

Yes, instead of putting them in a class put them directly into your module (name the file e.g. const.py so the module name is const). Using a class for this is pretty much abusing classes for namespacing – and Python has packages/modules for this purpose.

Then you could even use from const import * to import all globals from this module if you don’t want to write const. in front of everything. However note that this is usually discouraged as it potentially imports lots of things into the global namespace – if you just need one or two constants from const import ABC, DEF etc. would be fine though.