Tutorial Python Lambda

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The way you spell “lambda” is to remember to spell the animal “lamb” first. Lambda are just anonymous functions that are used once in-line — like Javascript anonymous functions.

The map function expects a function, so we can pass in a lambda instead …

doubles = list( map(lambda x : x*2, [0, 1, 2, 3])))
# [0, 2, 4, 6]

Since the map function returns a map object with use list() to turn it into something useful (like a list).

This above is equivalent to list comprehension …

doubles = [ num*2 for num in [0, 1, 2, 3]]

Similarly, the filter function takes a lambda…

evens = list(filter(lambda x : x % 2 == 0, [0, 1, 2, 3]))

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