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Loops in Python

📘 Python 👁 62 views 📅 Nov 05, 2025
⏱ Estimated reading time: 1 min

Loops in Python

Loops are used to execute a block of code repeatedly based on a condition.

1. for Loop

  • Iterates over a sequence (list, tuple, string, or range).

# Loop through a list
fruits = ["apple", "banana", "cherry"]
for fruit in fruits:
    print(fruit)

# Loop through numbers using range
for i in range(5):
    print(i)  # 0 to 4

2. while Loop

  • Repeats as long as the condition is True.

i = 0
while i < 5:
    print(i)
    i += 1

3. Nested Loops

  • Place one loop inside another for complex iterations.

for i in range(1, 4):
    for j in range(1, 4):
        print(f"i={i}, j={j}")

4. Loop Control Statements

StatementDescriptionExample
breakExit the loop immediatelyif i == 3: break
continueSkip the current iterationif i % 2 == 0: continue
passDo nothing, acts as a placeholderpass

Example:

for i in range(5):
    if i == 2:
        continue  # skip 2
    elif i == 4:
        break     # stop loop at 4
    print(i)

5. else with Loops

  • Executed when the loop completes normally (no break).

for i in range(3):
    print(i)
else:
    print("Loop finished without break")

6. Key Points

  • for loops are sequence-based, while loops are condition-based.

  • Use nested loops for multi-dimensional data.

  • break stops the loop, continue skips an iteration, pass is a placeholder.

  • else with loops runs only if the loop ends naturally.

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Conditional Statements in Python
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Functions in Python
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