Python Coding challenge - Day 493| What is the output of the following Python Code?

 

Code Explanation:

Function Definition: make_funcs

This defines a function that will return a list of functions.

def make_funcs():

Initialize an Empty List

We initialize an empty list named funcs to store lambda functions.

funcs = []

Loop from 0 to 3

The loop runs 4 times with i taking values from 0 to 3.

for i in range(4):

Create a Closure with Default Argument

funcs.append(lambda x=i: lambda: x*i)

This is the trickiest part:

x=i is a default argument, which captures the current value of i at each iteration.

lambda x=i: returns another lambda: lambda: x*i.

So funcs will store inner lambdas, each remembering the value of i when they were created.

Return List of Inner Lambdas

return [f() for f in funcs]

Each f() returns the inner lambda (i.e., lambda: x*i).

So this returns:

[

  lambda: 0*0,

  lambda: 1*1,

  lambda: 2*2,

  lambda: 3*3

]

Call Each Inner Lambda

for f in make_funcs():

    print(f())

We now:

Call make_funcs() → get a list of 4 inner lambdas.

Call each of them with f(), which evaluates x*i from before.

 Intermediate Evaluation

lambda: 0*0 → 0

lambda: 1*1 → 1

lambda: 2*2 → 4

lambda: 3*3 → 9

Final Output

0

1

4

9