While Loop in Python
The while loop in Python is a control flow statement that repeats a block of code as long as a specified condition is true. It’s useful when the number of iterations is not known beforehand.
Key Points on While Loop:
- The while loop continues to execute as long as its condition evaluates to
True
. - It’s ideal for situations where the number of iterations depends on dynamic factors.
- Nested while loops are possible, allowing more complex logic structures.
- Control statements like break and continue can alter the loop flow.
- Take caution to avoid infinite loops if the condition never becomes
False
.
Syntax of While Loop:
Syntax Example
while condition:
# Code to execute in each iteration
Example of While Loop in Python:
This example demonstrates a basic while loop that prints numbers from 1 to 5.
Code Example
count = 1
while count <= 5:
print(count)
count += 1
Output
1
2
3
4
5
2
3
4
5
Detailed Explanation:
- Condition: The loop executes as long as the specified condition is
True
. - Increment/Decrement: It's essential to update variables within the loop to ensure the condition eventually becomes
False
. - Control Statements:
break
can exit the loop, andcontinue
skips to the next iteration.
Mastering the while loop helps in creating flexible loops that adapt to runtime conditions in Python programs.