class NullBooleanField(**kwargs) [source]
 
- Default widget: 
NullBooleanSelect - Empty value: 
None - Normalizes to: A Python 
True,FalseorNonevalue. - Validates nothing (i.e., it never raises a 
ValidationError). 
class NullBooleanField(**kwargs) [source]
 
NullBooleanSelect
None
True, False or None value.ValidationError).
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