Idiomatic, minimal Python constructs

Favor clear, idiomatic Python over verbose, manual, or unpythonic constructs, and avoid introducing unnecessary complexity or unrelated refactors just to satisfy a linter/type-checker. Specifically:

• Replace manual loops with comprehensions or built-ins when possible. E.g. use [(category, x) for x in values] instead of map(lambda x: (category, x), values), use dict.update(other) instead of a manual union loop, use for i, x in enumerate(items) instead of manual indexing, and prefer for...else over manual “found” flags.
• Collapse trivial conditionals into direct expressions: return all(...) instead of if all(...): return True, or provide_automatic_options = "OPTIONS" not in methods instead of a multi-branch if/else that only sets a boolean.
• Use the correct idiom for type/identity checks: callable(obj) instead of hasattr(obj, '__call__'), isinstance(x, str) instead of type(x) is str, and == (never is) for comparing values like numbers or strings.
• Don’t add redundant code that has no effect, such as a t.cast() that doesn’t change the inferred type, an unnecessary import of a module already imported at module scope, or explicitly passing a default value (e.g. None) that’s already the implicit default.
• When fixing an unrelated issue (e.g. a type-checker complaint), prefer the smallest possible change (e.g. a # type: ignore comment) over refactoring working code, especially in hot paths where extra variables/calls aren’t free.
• Keep ordering-sensitive logic in ordered structures (lists/tuples), not sets, since set iteration order isn’t guaranteed.

Example:

# Avoid
results = []
for category, values in flashes.items():
    results += map(lambda x: (category, x), values)

# Prefer
results = [(category, x) for category, values in flashes.items() for x in values]

Applying this standard keeps diffs small, logic easy to scan, and avoids subtle bugs introduced by overly clever or needlessly verbose code.