python3 selfts = lambda introundtimetime 1000

This line of code creates a lambda function called ts that returns the current timestamp in milliseconds.

Here's how it works:

1. time.time() returns the current time in seconds since the epoch (January 1, 1970).
2. round(time.time() * 1000) multiplies the current time by 1000 to convert it to milliseconds and rounds it to the nearest integer.
3. int(round(time.time() * 1000)) converts the result to an integer.

By assigning this lambda function to self.ts, you can use it to get the current timestamp in milliseconds whenever you need it