Using While and Nested For Loops in Python

Why I studied this

I wanted to get comfortable with while and nested for loops.
They are important when solving repetitive problems or printing shapes in the console.

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What I did

Using while loops

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

This prints numbers from 1 to 5.

num = 1
while num < 100:
    num += 1
    if num % 2 == 0:
        continue
    if num > 30:
        break
    print(num)

This skips even numbers and stops after printing odd numbers under 30.

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Printing multiplication tables using nested for loops

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

This prints the 2 to 9 multiplication table.

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Triangle pattern using nested for loop

for i in range(1, 6):
    for j in range(i):
        print("*", end="")
    print()

This prints a right-angled triangle with stars.

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Diamond shape pattern

n = 5
for i in range(n):
    for j in range(n - i - 1):
        print(" ", end="")
    for k in range(i * 2 + 1):
        print("*", end="")
    print()

for i in range(n - 2, -1, -1):
    for j in range(n - i - 1):
        print(" ", end="")
    for k in range(i * 2 + 1):
        print("*", end="")
    print()

This prints a diamond pattern using stars.

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What I learned

• while loops repeat as long as a condition is true
• for loops with range() are great for counting and patterns
• Nested loops can be used to print shapes or solve grid-based problems

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What I want to do next

I want to practice using while loops with user input and try creating more advanced shapes using loops.