When we write code, it's crystal clear to us what it does, but this won't be the case in a few months when we might have to change it again.
This is why it's good practice to place comments in the code where we explain what different parts of the code do.
There are two ways to place comments in Python code.
A comment that takes up a single line can be written after a "#" character:
# Comment
If the comment is used to explain a singular command, it can be placed on the same line right after it:
ev3.speaker.play_file(SoundFile.BOING) # Plays the sound "BOING"
If we wish to use more than one line for a comment, we can place it in between a pair of three double quotes:
"""
Comment
Comment
Comment
"""
The first three double quotes mark the beginning of the comment. If the code does not have another three double quotes, then the program will treat the rest of the code as a comment and will not execute it.
Many programmers mark parts of their code as comments when they want to temporarily switch it of without deleting it.
This Tutorial is used in the following courses and lessons
In the second level of Python for EV3 robots, students learn in-depth the touch sensor. The sensor is used as an input device for manual control of machines, as well as a sensor for autonomous robots. In a pair of lessons, students build a control panel for the grabber and the movement of a crane. Programming wise, students learn how to fork code with "if-else" constructions, how to create conditional and forever loops with "while" and how to negate conditions with "not" operator. In the end of the lesson, robots can detect obstacles and avoid them, so that they traverse a simple labyrinth.
For students who will not take two levels in a row today is their last lesson.