If you need an expression that returns different values under different conditions, Python provides conditional expressions using a ternary conditional operator.
- [Instructor] Beginning with Version 2.5, Python includes a ternary conditional operator. It's important to note that this operator does not work in versions of Python previous to Python 2.5. Of course, we're in Python 3.6 here. So we can demonstrate it here in Komodo. I've opened a working copy of ternary.py from chapter four of the exercise files. This has a simple example of the ternary operator.
Down here on line five, we assign X to be this string, Feed the bear now!, if hungry. And we have this hungry variable above, which is set to logical value true. So that's being tested here in this if clause. And there's an else, it says, Do not feed the bear. So if the bear is hungry, then the string will be Feed the bear now! If the bear is not hungry, then it will be Do not feed the bear.
So when I save and run this it says Feed the bear now! If I set hungry to false, remember zero works fine for false, I save and run and it says, Do not feed the bear. Now it's important to note that all of this is required if you're going to have the ternary conditional operator, you must have both if and else. You must have both clauses. Of course, if you want to, you can have else, set it to none. So when I save and run it will say None.
But you must have an else clause. It does not work with just the if clause. The ternary conditional operator is used occasionally, but it can be very convenient in some circumstances.
- Python anatomy
- Types and values
- Conditionals and operators
- Building loops
- Defining functions
- Python data structures: lists, tuples, sets, and more
- Creating classes
- Handling exceptions
- Working with strings
- File input/output (I/O)
- Creating modules
- Integrating a database with Python db-api
Skill Level Intermediate
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2. Language Overview
3. Types and Values
8. Structured Data
11. String Objects
12. File I/O
13. Built-in Functions
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