classBooleanField(Field):widget=CheckboxInputdefto_python(self,value):"""Return a Python boolean object."""# Explicitly check for the string 'False', which is what a hidden field# will submit for False. Also check for '0', since this is what# RadioSelect will provide. Because bool("True") == bool('1') == True,# we don't need to handle that explicitly.ifisinstance(value,str)andvalue.lower()in ("false","0"):value=Falseelse:value=bool(value)returnsuper().to_python(value)defvalidate(self,value):ifnotvalueandself.required:raiseValidationError(self.error_messages["required"],code="required")defhas_changed(self,initial,data):ifself.disabled:returnFalse# Sometimes data or initial may be a string equivalent of a boolean# so we should run it through to_python first to get a boolean valuereturnself.to_python(initial)!=self.to_python(data)