Python Coding challenge - Day 564| What is the output of the following Python Code?

 

Code Explanation:

1. Defining the compose Function

def compose(f, g):

    return lambda x: f(g(x))

Explanation:

This defines a function called compose which takes two functions f and g as arguments.

It returns a new function (using a lambda expression) that:

Takes an input x

First applies g to x → g(x)

Then applies f to the result → f(g(x))

This is function composition, where the output of g becomes the input to f.

2. Defining Function f

f = lambda x: x + 1

Explanation:

f is defined as a lambda function (anonymous function).

It takes input x and returns x + 1.

Example:

If x = 3, then f(3) returns 4.

3. Defining Function g

g = lambda x: x * 2

Explanation:

g is another lambda function.

It takes input x and returns x * 2.

Example:

If x = 3, then g(3) returns 6.

4. Creating the Composed Function h

h = compose(f, g)

Explanation:

We call the compose function with f and g as inputs.

h now becomes a new function defined as:

h(x) = f(g(x))

So for any input x, h(x) will first double x (via g), then add 1 (via f).

5. Printing the Result of h(3)

print(h(3))

Explanation:

This calls the composed function h with input 3.

It computes:

g(3) = 3 * 2 = 6

f(6) = 6 + 1 = 7

So, h(3) returns 7.

Output:

7

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