How to distinguish a coroutine from a regular function in programming?

A coroutine in programming can be distinguished from a regular function by several features:

• Suspension and resumption: a coroutine can suspend its execution (for example, using yield or await) and resume later, whereas a regular function runs from start to finish without pauses.
• State: a coroutine maintains its state between calls, unlike a regular function.
• Syntax: in Python, coroutines are usually defined with async def and use await inside, or as generators with yield.

Example of a coroutine in Python:

import asyncio

async def my_coroutine():
    print('Start')
    await asyncio.sleep(1)  # suspends execution
    print('End')

A regular function cannot use await and does not suspend execution.