Python Coding challenge - Day 1198| What is the output of the following Python Code?

 

Code :

from operator import methodcaller text = "python" upper = methodcaller("upper") print(upper(text))

Explanation:

🔹 1. Importing methodcaller

from operator import methodcaller

✅ Explanation

methodcaller() is imported from Python's operator module.

It creates a function that calls a specific method on any object you pass to it.

Instead of calling a method directly, methodcaller stores the method name and calls it later.

Think of it like a remote control.

TV

        ▲

        │

Remote

        │

Press "Power"

        │

TV Turns ON

Here,

Remote → methodcaller

Power Button → "upper"

TV → "python"

🔹 2. Creating a String

text = "python"

✅ Explanation

A string variable named text is created.

Current memory:

text

 │

 ▼

"python"

🔹 3. Creating a Method Caller

upper = methodcaller("upper")

✅ Explanation

This line does not call the upper() method.

Instead, it creates a callable object that remembers:

Whenever someone gives me an object,

I'll call its upper() method.

Think of it like preparing a command.

Current memory:

upper

 │

 ▼

Call upper() later

Nothing has executed yet.

🔹 4. What is Stored Inside upper?

Internally Python creates something similar to:

def upper(obj):

    return obj.upper()

So,

upper = methodcaller("upper")

behaves almost like:

def upper(obj):

    return obj.upper()

It is waiting for an object.

🔹 5. Calling the Function

upper(text)

✅ Explanation

Now Python passes:

text

to the stored function.

Internally:

text.upper()

gets executed.

Current value:

"python"

🔹 6. Executing upper()

Python now performs:

"python".upper()

The upper() string method converts every lowercase letter into uppercase.

Before:

python

After:

PYTHON

Notice:

The original string is not changed because strings are immutable.

🔹 7. Printing the Result

print(upper(text))

✅ Explanation

Python prints the returned value.

Output:

PYTHON

🎯 Final Output

PYTHON