Quiz: Which syntax creates a list of squared numbers from 0 to 4 in a single line?
[x**2 for x in range(5)] is a list comprehension producing [0, 1, 4, 9, 16] .
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[x**2 for x in range(5)] is a list comprehension producing [0, 1, 4, 9, 16] .
Context managers implement __enter__() (called on entry) and __exit__() (called on block exit, handling exceptions).
dict.get(key, default) safely retrieves a value or returns the fallback default without raising KeyError .
The else block executes only if the try block succeeds without throwing any exceptions .
defaultdict(factory) calls the given factory function (e.g. int , list ) to generate a default value whenever a missing key is accessed.
lru_cache stores recent function invocation results to avoid re-evaluating deterministic input arguments.
… code across combinations of runtime versions (e.g. Python 3.9, 3.10, 3.11 on Ubuntu and macOS).
The Terraform state file records the current state of managed infrastructure and metadata, enabling Terraform to calculate required changes during plans/applies.