title: __init__ method for form with additional arguments
body: <p>I'm calling my form, with additional parameter 'validate :</p>
  
  <p><code>form = MyForm(request.POST, request.FILES, validate=True)</code></p>
  
  <p>How should I write form's <strong>init</strong> method to have access to this parameter inside body of my form (for example in _clean method) ? This is what I came up with :</p>
  
  <pre><code>def __init__(self, *args, **kwargs):
      try:
          validate = args['validate']
      except:
          pass           
      if not validate:
          self.validate = False
      elif:
          self.validate = True
      super(MyForm, self).__init__(*args, **kwargs) 
  </code></pre>