Python Set Methods & Operations Explained | [DAY-23] – Python Basic to Advanced (AI/ML) in Hindi

Описание: In Day 23, we go hands-on with set operations and methods — the stuff you actually use in real programs.

What you'll learn in this lesson:
Iterating through a set using for loop
Checking membership using in and not in
Adding elements using add()
Why set items must be hashable and immutable
Adding tuples to a set (and why lists fail)
Combining sets using update()
Updating sets using iterables (list/tuple)
Removing elements using:
remove() (throws error if missing)
discard() (safe removal)
pop() (random removal)
Clearing all items using clear()
Deleting an entire set using del
Joining sets using union()
Sets are built for speed and uniqueness.
If you're still using lists for membership checks, you're leaving performance on the table.

======================HOME ASSIGNMENT======================

1️⃣ Membership Muscle Memory
Create a set of numbers.
Check if a specific number exists
Check if another number does not exist
Print proper messages (not just True/False)

2️⃣ Add with Awareness
Create an empty set.
Add an integer
Add a float
Add a string
Add a tuple
Then try adding a list and observe the error.
👉 Write one comment:
Why does Python reject lists in sets?
This builds deep understanding, not fear of errors.

3️⃣ Update Like a Pro
Create two sets:
a = {10, 20, 30}
b = {30, 40, 50}
Tasks:
update a using b
update a using a list [60, 70]
print a after each step

4️⃣ remove() vs discard() (Very Important 🔥)
Create a set with 4 items.
Remove one existing item using remove()
Try removing the same item again (see error)
Now do the same with discard()
Explain in one line:
Which method is safer and why?

5️⃣ Pop Reality Check
Create a set.
Use pop() twice
Print removed values
👉 Observe: order is unpredictable.
That’s the point. Sets don’t care about order.

🔥 Mini Project (Must Do)
Unique Course Enrollment System
enrollments = ["Amit", "Riya", "Amit", "Karan", "Riya", "Neha"]
Tasks:
total enrollments (list length)
unique students (convert to set)
add a new student
remove a student safely
Print final enrollment list.
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