Re: [Python-ideas] PEP: Dict addition and subtraction

[João Matos]

Hello, I've just read your PEP 585 draft and have some questions. When you say " Like the merge operator and list concatenation, the difference operator requires both operands to be dicts, while the augmented version allows any iterable of keys. >>> d - {'spam', 'parrot'} Traceback (most recent call last): ... TypeError: cannot take the difference of dict and set >>> d -= {'spam', 'parrot'} >>> print(d) {'eggs': 2, 'cheese': 'cheddar'} >>> d -= [('spam', 999)] >>> print(d) {'spam': 999, 'eggs': 2, 'cheese': 'cheddar', 'aardvark': 'Ethel'}   " The option d -= {'spam', 'parrot'} where parrot does not exist in the d dict, will raise an exception (eg. KeyNotFound) or be silent? The option d -= [('spam', 999)] should remove the pair from the dict, correct? But the print that follows still shows it there. It's a mistake or am I missing something? Best regards, João Matos

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