Booleans and None

True/False drive conditions; None represents "no value".

Beginner

True and False are the two bool values. In conditions Python also treats values as truthy or falsy: 0, 0.0, "", [], {} and None are falsy; most other values are truthy.

None means "nothing here" — for example a function with no return returns None. Check for it with is:

if result is None:
    print("No reading yet")

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