{"id":737,"date":"2020-10-23T07:20:33","date_gmt":"2020-10-23T07:20:33","guid":{"rendered":"https:\/\/www.pythontutorial.net\/?page_id=737"},"modified":"2025-03-31T04:14:48","modified_gmt":"2025-03-31T04:14:48","slug":"python-do-while","status":"publish","type":"page","link":"https:\/\/www.pythontutorial.net\/python-basics\/python-do-while\/","title":{"rendered":"Python do…while Loop Statement Emulation"},"content":{"rendered":"\n

Summary<\/strong>: in this tutorial, you’ll learn how to emulate the do...while<\/code> loop statement in Python<\/p>\n\n\n\n

Introduction to the do…while loop statement #<\/a><\/h2>\n\n\n\n

If you have come from other programming languages such as JavaScript<\/a>, Java, or C#, you’re already familiar with the do...while<\/code> loop statement.<\/p>\n\n\n\n

Unlike the while<\/a><\/code> loop, the do...while<\/code> loop statement executes at least one iteration. It checks the condition<\/code> at the end of each iteration and executes a code block until the condition<\/code> is False<\/code>.<\/p>\n\n\n\n

The following shows the pseudocode for the do...while<\/code> loop in Python:<\/p>\n\n\n

do<\/span>\n    # code block<\/span>\nwhile<\/span> condition<\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
First, specify the condition<\/code> as True<\/code> in the while<\/code> loop like this:<\/p>\n\n\n
while<\/span> True<\/span>:\n    # code block<\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
This allows the code block to execute for the first time. However, since the condition is always True<\/code>, it creates an indefinite loop. This is not what we expected.<\/p>\n\n\n\n
Second, place a condition to break out of the while<\/code> loop:<\/p>\n\n\n
while<\/span> True<\/span>:\n    # code block<\/span>\n\n    # break out of the loop<\/span>\n    if<\/span> condition\n        break<\/span><\/code><\/span>Code language:<\/span> PHP<\/span> (<\/span>php<\/span>)<\/span><\/small><\/pre>\n\n\n
In this syntax, the code block always executes at least one for the first time and the condition is checked at the end of each iteration.<\/p>\n\n\n\n
Python do…while loop emulation example #<\/a><\/h2>\n\n\n\n
Suppose that you need to develop a number guessing game with the following logic:<\/p>\n\n\n\n
Unfortunately, Python doesn’t support the do...while<\/code> loop. However, you can use the while<\/code> loop and a break<\/a><\/code> statement to emulate the do...while<\/code> loop statement.<\/p>\n\n\n\n