Python Switch Alternatives: match, if and a Lookup Dictionary

Start with a small, explicit task

Route three fictional control commands to display instructions. Two commands share a response, one has its own response, and everything else receives a default. Compare literal match cases with a small lookup mapping. The script returns text only; it does not control equipment or execute a command.

Run the complete example

This original example was checked with Python 3.12.14. Save it as python_switch.py and run it with Python 3.12. It uses only the standard library. The assertions check the stated results.

def route(command):
    match command:
        case "pause" | "hold":
            return "wait"
        case "resume":
            return "continue"
        case _:
            return "unknown"
lookup = {"pause": "wait", "hold": "wait", "resume": "continue"}
commands = ["pause", "resume", "stop"]
results = [route(command) for command in commands]
assert results == ["wait", "continue", "unknown"]
assert results == [lookup.get(command, "unknown") for command in commands]
assert route("hold") == "wait"
print(results)

Explain the result

pause and hold are quoted string literals, and the vertical bar makes them alternatives for one response. The wildcard underscore handles stop because no earlier literal matches. There is no fall-through requiring a break after each return. The dictionary expresses the same fixed mapping with less branching in this particular task.

An if/elif chain is useful when decisions involve ordered conditions rather than a fixed lookup, such as comparing several thresholds. match is useful when the shape of the input matters, but that larger pattern-matching task is outside this literal command example. Choose the construct that makes the actual decision readable rather than mechanically translating another language’s syntax.

Avoid these mistakes

An unquoted bare name in a pattern can capture a value instead of comparing it with a variable, so do not remove the quotes from these literal commands. This script requires Python 3.10 or later and was checked on 3.12; use an if chain or dictionary when targeting an older interpreter.