✅ Python Loops (for & while)

Loops help repeat tasks automatically — very important for data processing and automation.

🔹 1. What are Loops?
Loops repeat a block of code multiple times.
👉 Used in:
✅ Data cleaning
✅ Data analysis
✅ Machine learning
✅ Automation

🔥 2. for Loop (Most Used) ⭐
Used to iterate over a sequence (list, string, range).

✅ Basic Syntax

for variable in sequence:
    # code

✅ Example — Print Numbers

for i in range(5):
    print(i)

Output: 0 1 2 3 4
👉 range(5) → generates numbers from 0 to 4.

✅ Loop Through List (Very Important)

numbers = [10, 20, 30]
for num in numbers:
    print(num)

👉 Used heavily in data science.

🔥 3. while Loop
Runs until condition becomes False.

✅ Syntax

while condition:
    # code

✅ Example

x = 1
while x <= 5:
    print(x)
    x += 1

Output: 1 2 3 4 5
👉 Important: Update condition to avoid infinite loop.

🔹 4. Loop Control Statements (Very Important)

✅ break → stop loop

for i in range(5):
    if i == 3:
        break
    print(i)

Output: 0 1 2

✅ continue → skip current iteration

for i in range(5):
    if i == 3:
        continue
    print(i)

Output: 0 1 2 4

🎯 Today’s Goal
✅ Use for loop
✅ Use while loop
✅ Understand break & continue

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