[Automatically set attributes from __init__ args in Pyhon] #python #args #init #constructor

autoargs.py

# Also check data classes and collections for this

import inspect
import functools

def autoargs(*include,**kwargs):   
    def _autoargs(func):
        attrs,varargs,varkw,defaults=inspect.getargspec(func)
        def sieve(attr):
            if kwargs and attr in kwargs['exclude']: return False
            if not include or attr in include: return True
            else: return False            
        @functools.wraps(func)
        def wrapper(self,*args,**kwargs):
            # handle default values
            for attr,val in zip(reversed(attrs),reversed(defaults)):
                if sieve(attr): setattr(self, attr, val)
            # handle positional arguments
            positional_attrs=attrs[1:]            
            for attr,val in zip(positional_attrs,args):
                if sieve(attr): setattr(self, attr, val)
            # handle varargs
            if varargs:
                remaining_args=args[len(positional_attrs):]
                if sieve(varargs): setattr(self, varargs, remaining_args)                
            # handle varkw
            if kwargs:
                for attr,val in kwargs.iteritems():
                    if sieve(attr): setattr(self,attr,val)            
            return func(self,*args,**kwargs)
        return wrapper
    return _autoargs
  
  # Example:
  
  class Foo(object):
    @autoargs()
    def __init__(self,x,path,debug=False,*args,**kw):
        pass
foo=Foo('bar','/tmp',True, 100, 101,verbose=True)

print(foo.x)
# bar
print(foo.path)
# /tmp
print(foo.debug)
# True
print(foo.args)
# (100, 101)
print(foo.verbose)
# True