You should already know how your program can make a decision based on a given condition, but sometimes, the decisions it has to make require more than one condition.
This can be done in several ways and we will look at how to do it using logical operators.
The "if" logical operator can contain code that includes more "if" logical operators. Here's what your program should look like if you check for conditions using nested logical operators:
if (first condition): if (second condition): (conditionally executed code)
If the first condition is not met, the nested "if" will not be checked at all. If the nested condition is not met, the conditionally executed code will not be executed. This way the code is executed when both conditions are met.
This method can be applied for more than two conditions.
Pay attention to the levels of code indentation. If both "if" operators are on the same indentation level, they won't be codependent:
if (first condition): if (second condition): (conditional code)
This is an example of incorrectly written code.
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.
Today, we will continue building upon the control console from the previous lesson by creating a robot that is controlled using gestures.
Some gesture sensors work by briefly activating nearby sensors. You will be using the touch sensor to simulate this process and create your own gesture sensor.
