Attribute Name:
_field_defaults
Overview:
- _field_defaults attribute has the default values for the fields of a named tuple.
- Using the defaults parameter of the namedtuple constructor function, default values can be specified for one or mode fields.
Example:
|
# Example Python program that uses the defaults parameter while creating namedtuple instances import collections
# Create a named tuple called speed speed = collections.namedtuple("speed", "vehicle_number , speed, timestamp, tyrecount", defaults=[4]);
# Create speed records for vehicles s1 = speed("xxxxxxx-xxxxxx", 65, "12:01:12"); s2 = speed("xxxxxxx-xxxxxx", 70, "12:01:12", 6);
# Print default values for name tuple print(s2._field_defaults);
# Print speed records print(s1); print(s2); |
Output:
|
{'tyrecount': 4} speed(vehicle_number='xxxxxxx-xxxxxx', speed=65, timestamp='12:01:12', tyrecount=4) speed(vehicle_number='xxxxxxx-xxxxxx', speed=70, timestamp='12:01:12', tyrecount=6) |