Learn Python Infinite Loops in while

An infinite loop is a loop that never stops executing because its condition never becomes False.

In Python, infinite loops mostly happen due to logical mistakes, not syntax errors.

Most Common Mistake: Missing Update Statement

Condition is always True
i is never updated
Loop runs forever

Correct Version

Using Wrong Condition

Condition expects x to decrease
But x increases
Loop never ends

Correct Logic

Infinite Loop with `while True`

Condition is always True
Loop never stops unless manually interrupted

Caution

Always use break with while True.

Fixing `while True` Using `break`

Infinite Loop with `continue`

When i becomes 3, continue skips update
i stays 3 forever

Correct Use of `continue`

Wrong Input Handling

Input is taken only once
Condition never changes

Correct Input Handling

Logical Error (Condition Never Met)

Condition is False initially
Loop never runs

Note

This is not an infinite loop, but a logic mistake.

Nested Loop Mistake

Inner loop variable j is never updated
Inner loop becomes infinite

Correct Nested Loop

Real World Example

Real World Scenario

Application freezing due to infinite loop

Exercise

Practice Task

Identify infinite loop in a given program
Fix a loop where variable is not updated
Correct misuse of continue
Convert infinite loop into controlled loop using break