DAY 4 OF PYTHON NOTES

DAY 4 OF PYTHON NOTES

🔹 1. for Loop Basics

✅ Syntax:

python
for variable in range(start, stop, step):
    # code block

• start: where to begin (default is 0)

• stop: where to end (not included!)

• step: how much to increment (default is 1)

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🔹 2. Using range()

📘 Examples:

python
# Print 1 to 5
for i in range(1, 6):
    print(i)

# Print 0 to 9
for i in range(10):
    print(i)

# Print even numbers from 2 to 10
for i in range(2, 11, 2):
    print(i)

# Print in reverse (10 to 1)
for i in range(10, 0, -1):
    print(i)

---

🔹 3. Pattern Printing with Loops

✅ Print 5 stars:

python
for i in range(5):
    print("*")

✅ Print stars in one line:

python
for i in range(5):
    print("*", end=" ")

✅ Print triangle pattern:

markdown
*
* *
* * *
* * * *

python
for i in range(1, 5):
    print("* " * i)

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🔹 4. Nested for Loops

Used to print grids, tables, patterns, etc.

📘 Print a 3x3 grid of stars:

python
for i in range(3):
    for j in range(3):
        print("*", end=" ")
    print()

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🔹 5. Practice Problems

1. Print first 10 even numbers using for loop.

2. Print the multiplication table of a given number.

3. Print a square pattern of # of size 4x4.

4. Print numbers divisible by 3 between 1 and 50.

5. Print reverse pattern:

markdown
* * * *
* * *
* *
*

---

🔚 Summary

Concept	Use Case
for + range	Repeating with known count
end=' '	Print on the same line
Nested loops	Patterns, grids, tables

                                                                                                                                       BY-ABHITECH