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The Apple plist format does not support None or Null values in its output. A Null value in plist is denoted by the absence of the key in the data structure.
The python plist writer generates a TypeError when a None value is encoded. This issue is to track dealing with None values.
A suggestion is to have a flag on the various plist write functions and methods that will allow ignoring None values.
No changes are required to the plist reader.

At first I didn't like the proposal, but when I looked at the JSON module I noticed it has similar functionality for ignoring keys that cannot be represented in a JSON file.
I'll look into this after merging #14455.
The JSON library has two other options that might be useful for the plistlib library: sort_keys (sort the keys in the serialization of of dicts) and default(obj), which is a function for transforming values that cannot be represented natively.

Note that binary plist format supports None.

plistlib's internal implementation already supports sort_keys and skipkeys, those just are not wired to load() and loads().