✅ Chapter 4 – Lists and Tuples in Python

📌 lists.py

name = ["Prathamesh", "hello", 3890273, 873487.23982398, True, None]
print(name[4])  # Accessing 5th element: True

name[4] = False  # Modifying an element
print(name[4])   # Now it prints False

print(name[1:5:2])  # Slicing with a step of 2 → ['hello', 873487.23982398]

🧠 Concepts:

• Lists are ordered collections of items, enclosed in [].
• Lists are mutable (i.e., you can modify, add, remove items).
• Elements can be of any data type.
• Indexing starts at 0, and negative indexing is allowed.
• Slicing: list[start:stop:step] skips values using step.

📌 listmethods.py

name = ["Prathamesh", "hello", 3890273, 873487.23982398, True, None]
name.append(False)  # Adds item at end
print(name)

l1 = [12, 212, 3, 44, 55252, 5, 355, 363, 837, 29867, 5234967, 93485, 42]
l1.sort()           # Sorts the list in ascending order
print(l1)

l1.pop(12)          # Removes element at index 12
print(l1)

l1.count(3)         # Returns count of value 3
print(l1)

l1.reverse()        # Reverses the list in-place
print(l1)

l1.insert(3, 3333)  # Inserts 3333 at index 3
print(l1)

l1.remove(3)        # Removes first occurrence of 3
print(l1)

🧠 Important List Methods:

🔎 Note: List methods change the original list (in-place operations).

📌 tuple.py

# Wrong: a = (1)       → This is an integer, not a tuple
# Correct: a = (1,)    → This is a single-element tuple

name = (12, 27823, True, "Prathamesh", 263.782367)
print(name)
print(type(name))  # <class 'tuple'>

🧠 Concepts: