At times, we encounter situations that require us to use the `do-while` loop in Python. A **do-while loop** is important because it is a **post-test loop**, meaning that it checks the condition *only* after executing the code in the loop block.

> Even though Python doesn’t explicitly have the `do-while loop`, we can emulate it.

# Emulating a `do-while` loop in Python

There are two scenarios in which a loop terminates:
- The loop condition is no longer true/false (depending on the type of loop).
- A `break` statement is executed from within the code in the loop body.

> If the condition is to be checked after executing the loop block, we can bring the condition *inside* the loop block, set the loop condition to be always `true`, and `break` the loop once the condition is met *inside* ​the code block.



Have a look at the code,for printing the first 3 integers,below:

i = 1

while True:
    print(i)
    i = i + 1
    if(i > 3):
        break

Python

#include <iostream>
using namespace std;

int main() {

  int i = 1;

  do{
    cout << i << endl;
    i = i + 1;
  } while(i <= 3);
}




The `do-while` loop in C++ and the emulation of the same loop in Python result in the same output. In the Python emulation, `i` is being printed before the condition is checked, just ​like in the `do-while` loop in C++. 

How to emulate a do-while loop in Python

Python lacks native do-while loops but can emulate them using an always true loop and a break statement.

How to emulate a do-while loop in Python

General syntax

Emulating a do-while loop in Python

Emulating a `do-while` loop in Python