Dynamic class loading in python

Code :

def create(class_name):

#check for module name
module_name,class_name = class_name.rsplit(".",1)
#check if the module already loaded
if module_name not in sys.modules:
#import module
__import__(module_name)
module = sys.modules[module_name]
# fetch class
cls =getattr(module,class_name)
#create an instance of the class
return cls()

#returns an instance of html.parser.HTMLParse
obj = create('html.parser.HTMLParser')




How it works

1. Get class and module name.'HMTLParser' is the class and 'html.parser' is the module.
2. Check if the module already loaded.'sys.module' object contains all loaded module list.
3. If no module exist manually load the module using __import__() function.
4. Get the module object from the 'sys.modules' using getattr() function.
5. Get class object form the module object again using getattr() function
6. Create instance for the object.