Create multiple classes from List of Strings

Question

I have a list of string as follows:

list = ['ContactHandler', 'LogHandler', 'FileHandler', 'SystemHandler', 'WelcomeHandler']

I want to use this list to create 5 classes in a for loop. An example of one class is shown below.

class WelcomeHandler(BaseHandler):
        def get(self):
            response = HTTPResponse()
            response.write('WelcomeHandler')
            return response

Duplicate? stackoverflow.com/questions/5352781/…

egpbos
– egpbos

2016-03-22 16:15:55 +00:00
Commented Mar 22, 2016 at 16:15 — egpbos
– egpbos, Commented Mar 22, 2016 at 16:15

zondo · Accepted Answer · 2016-03-22 16:21:05Z

1

You should use a dictionary for your classes and define them like this:

classes = {}
for name in classlist:
    class Handler(BaseHandler):
        def get(self):
            response = HTTPResponse()
            response.write(self.__class__.__name__)
            return response
    Handler.__name__ = name
    classes[name] = Handler

edited Mar 22, 2016 at 16:21

answered Mar 22, 2016 at 16:11

zondo

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2 Comments

ak52 Over a year ago

Can I import these classes from another.py with the given names from the dictionary?

zondo Over a year ago

Not exactly. You can use import myfile; WelcomeHandler = myfile.classes['WelcomeHandler'], though. (That's assuming that this file is called myfile.py.

Chad S. · Accepted Answer · 2016-03-22 16:09:47Z

1

Make a dictionary mapping the name to the class:

classLookup = {
    'ContactHandler': ContactHandler, 
    'LogHandler'    : LogHandler,
    #...
}

Then you can instantiate the right class based on the string

className = input('what class to instantiate?')
handler = classLookup[className]()

answered Mar 22, 2016 at 16:09

Chad S.

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