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.

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while condition:
    code block

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

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

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counter = 0

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

By utilizing the while loop’s ability to repeat until a condition is met, you can continuously prompt the user for input until a specific message is entered.

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# 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: ")