A List of Lambda Functions? This Python Puzzle May Surprise You…

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Guido doesn’t like lambda functions too much.

Yet, most large code projects contain a lot of them! (Many coders use lambda functions as GUI callbacks, etc.)

In this “Coffee Break Python” email series, we take a pragmatic approach regarding Python code style — living in the “is” rather than in the “should be” world.

Can you solve the following puzzle about lambda functions?

# Python Puzzle
fs = [
    lambda x: x + 1,
    lambda x: x + x,
    lambda x: x * x,

n = 0

for f in fs:
    n = f(n)

What’s the output of this code puzzle?

“Know Thyself and You Will Know the Universe”. ?

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