"No file was submitted. Check the encoding type on the form." for 'invalid', return value of the function _ called with an argument, string "No file was submitted." for 'missing', return value of the function _ called with an argument "The submitted file is empty.", for 'empty', return value of the function ungettext_lazy called with 3 arguments: string 'Ensure this filename has at most %(max)d character (it has %(length)d).', string 'Ensure this filename has at most %(max)d characters (it has %(length)d).' and string 'max' for 'max_length', and return value of the function _ called with an argument string, 'Please either submit a file or check the clear checkbox, not both.' for 'contradiction'. define the method __init__ with 3 arguments: self, unpacked list args and unpacked dictionary kwargs.
def __init__ ( self , * args , ** kwargs ) :