{"id":60,"date":"2026-03-01T15:43:09","date_gmt":"2026-03-01T10:43:09","guid":{"rendered":"https:\/\/gigz.pk\/python\/?post_type=lesson&p=60"},"modified":"2026-03-13T09:47:27","modified_gmt":"2026-03-13T04:47:27","slug":"while-loop","status":"publish","type":"lesson","link":"https:\/\/gigz.pk\/python\/lesson\/while-loop\/","title":{"rendered":"While Loop"},"content":{"rendered":"\n

A while loop<\/strong> is used to repeat a block of code as long as a condition is True<\/strong>.
It is commonly used when the number of repetitions is not known in advance.<\/p>\n\n\n\n

The loop keeps running until the condition becomes False.<\/p>\n\n\n\n

SYNTAX OF WHILE LOOP<\/strong><\/h1>\n\n\n\n
while condition:
    # code block<\/pre>\n\n\n\n
If the condition is True, the loop runs.
If the condition becomes False, the loop stops.<\/p>\n\n\n\n
EXAMPLE 1: BASIC WHILE LOOP<\/strong><\/h1>\n\n\n\n
count = 1while count <= 5:
    print(count)
    count += 1<\/pre>\n\n\n\n
This loop prints numbers from 1 to 5.
The count += 1<\/code> increases the value each time, preventing an infinite loop.<\/p>\n\n\n\n
INFINITE LOOP<\/strong><\/h1>\n\n\n\n
If the condition never becomes False, the loop runs forever.<\/p>\n\n\n\n
while True:
    print(\"This will run forever\")<\/pre>\n\n\n\n
To stop an infinite loop manually, press Ctrl + C.<\/p>\n\n\n\n
WHILE LOOP WITH IF CONDITION<\/strong><\/h1>\n\n\n\n
num = 1while num <= 10:
    if num % 2 == 0:
        print(num)
    num += 1<\/pre>\n\n\n\n
This prints even numbers from 1 to 10.<\/p>\n\n\n\n
BREAK STATEMENT IN WHILE LOOP<\/strong><\/h1>\n\n\n\n
The break<\/code> statement stops the loop immediately.<\/p>\n\n\n\n
num = 1while num <= 5:
    if num == 4:
        break
    print(num)
    num += 1<\/pre>\n\n\n\n
The loop stops when num<\/code> becomes 4.<\/p>\n\n\n\n
CONTINUE STATEMENT IN WHILE LOOP<\/strong><\/h1>\n\n\n\n
The continue<\/code> statement skips the current iteration and moves to the next one.<\/p>\n\n\n\n
num = 0while num < 5:
    num += 1
    if num == 3:
        continue
    print(num)<\/pre>\n\n\n\n
This skips printing the number 3.<\/p>\n\n\n\n
WHILE LOOP WITH ELSE<\/strong><\/h1>\n\n\n\n
A while loop can also have an else block.
The else block runs when the loop finishes normally (not stopped by break).<\/p>\n\n\n\n
num = 1while num <= 3:
    print(num)
    num += 1
else:
    print(\"Loop finished successfully\")<\/pre>\n\n\n\n
IMPORTANT POINTS<\/strong><\/h1>\n\n\n\n
\u2022 Always make sure the condition eventually becomes False
\u2022 Update the loop variable inside the loop
\u2022 Use break and continue for better control
\u2022 Be careful to avoid infinite loops<\/p>\n\n\n\n
WHY WHILE LOOPS ARE IMPORTANT<\/strong><\/h1>\n\n\n\n
\u2022 Useful when repetitions depend on a condition
\u2022 Helpful for user input validation
\u2022 Used in real-world applications like login systems and menu-driven programs<\/p>\n\n\n\n
Understanding the while loop<\/strong> helps you create dynamic and condition-based Python programs.<\/p>\n\n\n
Home<\/a><\/span> \u00bb PYTHON FUNDAMENTALS (PYF) > Control Flow > While Loop<\/span><\/span><\/div>\n\n\n
<\/strong> 
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