Python · Theory

map()

Theory

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map() is built into Python. You do not import it. Freshers only need one honest call and the printed result — not a long definition.

map() — output — ['A', 'B']. map applies a function to each.

Wrong type often raises TypeError. Empty values matter for bool/all/any. Don’t mix map up with a similar name (sorted vs sort, int vs float).

Exam tip

Call map() once and say what prints.

# map()
print(list(map(str.upper, ["a", "b"])))

map() — output: ['A', 'B']. map applies a function to each.