Python break and continue

1. Using break to Exit a Loop Early

for number in range(1, 10):
    if number == 5:
        break
    print(number)

The loop stops immediately when the break statement is encountered.

---

2. Using continue to Skip an Iteration

for number in range(1, 6):
    if number == 3:
        continue
    print(number)

The current iteration is skipped, and the loop proceeds with the next cycle.

---

3. break in a while Loop

count = 0

while True:
    if count == 3:
        break
    print(count)
    count += 1

Demonstrates breaking out of an infinite loop.

---

4. continue in a while Loop

num = 0

while num < 5:
    num += 1
    if num == 2:
        continue
    print(num)

Illustrates bypassing specific values.

---

5. Using break in Nested Loops

for i in range(3):
    for j in range(5):
        if j == 2:
            break
        print(f"i={i}, j={j}")

break exits only the inner loop.

---

6. Using Flag with break for Controlled Exit

found = False

for number in range(10):
    if number == 7:
        found = True
        break

print("Found:", found)

Flag variables help manage complex exit logic.

---

7. break + else Interaction

for n in range(5):
    if n == 10:
        break
else:
    print("Loop completed without break")

The else executes only if the loop does not terminate via break.

---

8. continue for Input Filtering

for char in "python123":
    if char.isdigit():
        continue
    print(char)

Useful for skipping unwanted values during iteration.

---

9. Breaking Based on User Input

while True:
    user_input = input("Enter 'q' to quit: ")
    if user_input.lower() == 'q':
        break

Common pattern for controlled loop termination.

---

10. Performance Use Case with continue

numbers = [1, -2, 3, -4, 5]

for num in numbers:
    if num < 0:
        continue
    print(num)

Prevents unnecessary processing for invalid data, improving loop efficiency.

---