June 28, 2021
9:40 p.m.
This is more of a syntactic sugar than an actual new feature, but... Exactly, 'but' is the idea: a special keyword to be used in for statements to exclude values from the iterable. E.g., when iterating over a generator:
for i in range(0, 10) but (2, 8): would implicitly create a new generator comprehensively, as in: for i in (j for j in range(0, 10) if j not in [2, 8]):
It might not add such a feature to justify the definition of a but_stmt in python.gram, but it's fully compliant with Python's philosophy of concise, clear and elegant code. #road to a programming natural language (jk)