label set to None, initial set to None, help_text set to an empty string, unpacked list args and unpacked dictionary kwargs. call the __init__ method of the base class of the class ChoiceField, called with 7 arguments: required set to required,
super ( ChoiceField , self ) . __init__ ( required = required , widget = widget , label = label , initial = initial , help_text = help_text , * args , ** kwargs )