lesson1Title

lesson2Title

lesson3Title

lesson4Title

lesson5Title

lesson6Title

lesson7Title

lesson8Title

lesson9Title

lesson10Title

lesson11Title

lesson12Title

lesson13Title

lesson14Title

pythonIntroStep3Chapter2Title

pythonIntroStep3Chapter1Title

pythonIntroStep3Chapter3Title

pythonIntroStep3Chapter4Title

counter = 0

while False:
    print(f"counter: {counter}")
    counter += 1

# How to Execute a Loop While a Given Condition is True

The `while` loop repeatedly **executes a block of code** as long as the specified condition is `True`.

```python title="Structure of a while loop"
while condition:
    code block
```

After the `while` keyword, you must specify a condition followed by a `colon (:)`.

<br />

## Code Example

The following example executes the code block until the condition `counter < 5` becomes false, meaning until `counter` reaches `5`.

```python title="Example of a while loop"
counter = 0

# Repeat until the condition becomes False
while counter < 5:
    print(counter)
    counter += 1
# Output: 0, 1, 2, 3, 4
```

<br />

By leveraging the characteristic of the while loop to continue repeating until a certain condition is met, you can repeatedly prompt the user for input until a specific message is entered.

```python title="Example of handling user input"
# Variable to store user input
user_input = ""

# Repeat until the user enters 'exit'
while user_input.lower() != "exit":
    # Receive user input
    user_input = input("Enter 'exit' to quit: ")
```

In Python, you must include a colon (:) after the condition in a `while` loop.

### You need to add a colon (:) after the condition in a `while` loop.

How to Execute a Loop While a Given Condition is True

Code Example

You need to add a colon (:) after the condition in a while loop.

You need to add a colon (:) after the condition in a `while` loop.