Python Average Calculation | Dataford Interview Questions

Disney+ playback events are represented as a list of dictionaries. Write a function that returns the arithmetic mean of a specified numeric field, ignoring records where that field is absent.

Formal Specification

Implement average_field(records, field).

records is a list of dictionaries.
field is a string naming the value to average.
Every present value for field is an integer or floating-point number.
Return a floating-point average.
If no record contains field, return 0.0.
Do not modify records.

Constraints

0 <= len(records) <= 10^5
Each dictionary contains at most 20 fields
Field values are finite integers or floats
The requested field name is a non-empty string

Function Signature

def average_field(records, field):

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