Python Coding challenge - Day 548| What is the output of the following Python Code?

Code Explanation:

Importing the reduce function

from functools import reduce

reduce() is not a built-in function in Python 3, so you must import it from the functools module.

It reduces a sequence to a single value by applying a function cumulatively.

 Defining the list

data = [1, 2, 3, 4, 5]

A list named data is created, containing integers from 1 to 5.

This is the input sequence we’ll use with reduce().

 Applying reduce() to sum even numbers

result = reduce(

    lambda acc, x: acc + x if x % 2 == 0 else acc,

    data,

    0

)

Explanation of parts:

lambda acc, x: acc + x if x % 2 == 0 else acc

This is a lambda (anonymous) function used by reduce().

acc: Accumulator (the running total).

x: Current item from the list.

Condition: If x is even (x % 2 == 0), then add x to acc.

Otherwise, keep acc the same.

data

The iterable passed to reduce() — the list [1, 2, 3, 4, 5].

0

The initial value of acc. We start summing from 0.

Line 8: Printing the result

print(result)

Prints the final accumulated result:

6

Final Output:

6

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