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    <p>Please note that </p> <pre><code>class Foo(object): a = None </code></pre> <p>sets a key-value pair in <code>Foo</code>'s dict:</p> <pre><code>Foo.__dict__['a']=None </code></pre> <p>while</p> <pre><code>def __init__(self, a = None, b = None, c = None): self.a = a </code></pre> <p>sets a key-value pair in the Foo instance object's dict:</p> <pre><code>foo=Foo() foo.__dict__['a']=a </code></pre> <p>So setting the class members at the top of your definition is not directly related to the setting of the instance attributes in the lower half of your definition (inside the <code>__init__</code>.</p> <p>Also, it is good to be aware that <code>__init__</code> is Python's <em>initializer</em>. <code>__new__</code> is the class <em>constructor</em>.</p> <hr> <p>If you are looking for a way to automatically add some instance attributes based on <code>__init__</code>'s arguments, you could use this:</p> <pre><code>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 </code></pre> <p>So when you say</p> <pre><code>class Foo(object): @autoargs() def __init__(self,x,path,debug=False,*args,**kw): pass foo=Foo('bar','/tmp',True, 100, 101,verbose=True) </code></pre> <p>you automatically get these instance attributes:</p> <pre><code>print(foo.x) # bar print(foo.path) # /tmp print(foo.debug) # True print(foo.args) # (100, 101) print(foo.verbose) # True </code></pre> <p>PS. Although I wrote this (for fun), I don't recommend using <code>autoargs</code> for serious work. Being explicit is simple, clear and infallible. I can't say the same for <code>autoargs</code>.</p> <p><strike>PPS. Is it just me, or are a lot of buttons broken on Stackoverflow? The editor window has lost all its icons... :(</strike> Clearing the browser cache fixed the problem.</p>
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    1. COI forgot to add - thanks for clearing up my python terminologies.
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    2. CO@Jeeyoung: No problem; glad I could help.
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