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Python :=

#The walrus operator := assigns values to variables as part of a larger expression.
#In this example, the assignment expression helps avoid calling len() twice:

if (n := len(a)) > 10:
    print(f"List is too long ({n} elements, expected <= 10)")

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:: python

>>> range(10)[::2]
[0, 2, 4, 6, 8]

seq[start:end:step]

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