The "if" logical operator allows us to predict the conditions which the robot could wind up in, but what do we do if the conditions aren't met? Luckily. we have a solution to this problem.
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- #1628
- 11 Jun 2020
The "else" acts as an "Otherwise" expression. This operator can be written right after the "if" operator and will only execute its code if the "if" condition is not met.
Here's how your code should look when using this command:
if condition: (code for met condition) else: (code for UNmet condition) (code that will always be executed either way)
⚠️ Notice the colon after the "else" command. It's common to forget to place it in the beginning and the students wonder why their program does not work!
The "else" operator does not require a condition, which makes it useful for planning for unforseen situations.
Courses and lessons with this Tutorial
This Tutorial is used in the following courses and lessons
Python with LEGO Mindstorms EV3 - Level 2
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.
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Lesson 2 - Grabber control panel
Introduction
Today we will create a robot that you can control with just tha press of a button. It will detect when you have pressed the button once and when you've pushed it twice. Based on this, it will either open or close its pincers and the objects within.
In this lesson, as well as the next one, we will be building a control console: first for the pincers, later for a crane. We will be looking at the sensors as a means of human interaction with the robots before we make autonomous robots with them.
What aspect of your daily life would you automate?
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