Python Coding challenge - Day 511| What is the output of the following Python Code?

 

Code Explanation:

 Line 1: Function Definition

def func(x, y=5, z=None):

func is a function with 3 parameters:

x: required argument.

y: optional, default value is 5 (not used here).

z: optional, default is None.

Line 2–3: Check and Create List if Needed

    if z is None:

        z = []

If z is None, a new empty list is created.

This ensures that a new list is created for every call, avoiding shared mutable state.

Line 4: Append to List

    z.append(x)

Adds the value of x to the list z.

Line 5: Return the List

    return z

Returns the updated list.

Function Calls and Outputs

Call 1: func(1)

z is None → creates new list [].

Appends 1 → becomes [1].

Returns [1].

Output:

[1]

Call 2: func(2)

Again, z is None → new list [].

Appends 2 → becomes [2].

Returns [2].

Output:

[2]

Final Output:

[1]

[2]