'PasswordInput', 'HiddenInput', 'MultipleHiddenInput', 'ClearableFileInput', 'FileInput', 'DateInput', 'DateTimeInput', 'TimeInput', 'Textarea', 'CheckboxInput', 'Select', 'NullBooleanSelect', 'SelectMultiple', 'RadioSelect','CheckboxSelectMultiple', 'MultiWidget', 'SplitDateTimeWidget' and 'SplitHiddenDateTimeWidget'. MEDIA_TYPES is a tuple with 2 strings: 'css' and 'js'.
MEDIA_TYPES = ( 'css' , 'js' )