Ignite Talk - 2019 Python Gotchas, Tips, and Tricks
summary
Three concrete gotchas with concrete fixes: chained comparisons act as range checks so a b c parses as (a b) and (b c) not left association; and/or return operands so x and y yields x when x is falsy and x otherwise, causing surprising assignments; and mutable default arguments persist where a default list accumulates across calls — fix by using None (or another immutable) and creating the container inside the function.
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