Python Basics — Day 6 Loops (for / range)

Day 6 – Loops (for / range)

01. What is a Loop?

Loops are used when you want to repeat the same action multiple times.
In Python, the two main types of loops are for and while.
(Today we focus on for loops.)

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02. Basic for Loop

A for loop iterates over iterable objects like lists, strings, or ranges.

fruits = ["Apple", "Banana", "Grape"]

for f in fruits:
    print(f)

👉 Output:

Apple
Banana
Grape

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03. The range() Function

A built-in function commonly used for number sequences.

range(end)            # 0 to end-1
range(start, end)     # start to end-1
range(start, end, step) # start to end-1 with step

Examples:

for i in range(5):
    print(i)   # 0,1,2,3,4

for i in range(1, 6):
    print(i)   # 1,2,3,4,5

for i in range(2, 11, 2):
    print(i)   # 2,4,6,8,10

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04. Nested Loops

A for loop can be placed inside another for loop.

for i in range(2, 4):       # 2, 3
    for j in range(1, 4):   # 1, 2, 3
        print(i, "*", j, "=", i * j)

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05. Looping Through Strings

Strings are iterable, so you can loop through each character.

for ch in "Python":
    print(ch)

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06. Practice Examples

Example 1: Sum of Numbers from 1 to 10

total = 0
for i in range(1, 11):
    total += i
print("Sum:", total)

Example 2: Multiplication Table (2 times table)

for i in range(1, 10):
    print(f"2 x {i} = {2*i}")

Example 3: Iterating Over a List

names = ["Tom", "Anna", "Sabin"]
for n in names:
    print(f"Hello, {n}!")