Confirm by name

Write the codeMedium 2 stages

An abort can't be undone. The old abort(reason, confirm) could be called as abort("Test", True), where nothing on the line says what that True means, and a careless copy and paste could abort a real mission.

Make the confirmation impossible to give by accident.

Change the def line to abort(reason, *, confirm), so confirm can only be passed by name and can't be left out, and return the refusal when it isn't true. The calls print:

ABORT: Cabin pressure falling
Abort refused: pass confirm=True

With the * in place, abort("Test", True) stops with a TypeError, and so does abort("Test").

Confirm or refuse

Only by name, never left out

Finish stage 1 to unlock this stage.

Someone passed confirm="yes", and since a non-empty string is true, the abort ran. Accept only True itself, and add the call that tried:

ABORT: Cabin pressure falling
Abort refused: pass confirm=True
Abort refused: pass confirm=True

Compare with is not True instead of not confirm.

Refuse truthy values

Only True confirms

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Hints

Combining Different Argument Types

combining-argument-types.py

# The order is fixed: normal, then *args, then defaults, then **kwargs
def mission_log(name, *events, priority="normal", **details):
    print(name, "| priority:", priority)
    for event in events:
        print("    event:", event)
    for key, value in details.items():
        print("   ", key, "=", value)
    print()

# Only the required one. Everything else falls back
mission_log("Rosalind Franklin")

# Two loose values, so they land in events
mission_log("Chandrayaan-3", "launch", "soft landing")

# priority sits after the star, so it can only be set by name
mission_log("Chandrayaan-3", "launch", "soft landing", priority="high")

# Careful: passing it positionally just makes it another event
mission_log("Chang'e 6", "launch", "high")

# Anything else you name drops into details
mission_log("Chang'e 6", "sample sealed", priority="high", site="far side", grams=1935)

# Both stars at the call site, working together
timeline = ["launch", "orbit insertion"]
extra = {"agency": "ISRO", "year": 2023}
mission_log("Chandrayaan-3", *timeline, priority="high", **extra)

Open the full example

script.py

PythonLn 1, Col 1Spaces: 4

Loading the Python environment…

Command-line arguments (sys.argv)

Separate arguments with commas. They're passed on every Run as sys.argv[1:].