It can be useful to encapsulate a function in another function. A decorator is a metafunction that returns another function. This lesson provides an example of how useful this can be.
- [Instructor] A decorator is a form of metaprogramming…and it can be described as a special type of function…that returns a wrapper function.…Here in Komodo I've opened working copy of hello.py…from chapter seven of the exercise files.…First it's important to realize that in Python…everything is an object.…So a function is a type of object.…So if I'm here and I define a function…and I run it.…
So I'm calling the function…and you notice that it prints out this is f1.…But what's interesting here is I can say x equals f1…with the parenthesis and now I'm assigning that function…object to the variable x.…But everything is an object, so a variable is an object too…and I can simply call the function f1 by calling x.…So when I save and run, I get exactly the same result.…So this means that I can do silly things like this.…
So now what I've done, is I've created a function f1…that contains another function f2…and I cannot call f2 directly, because it's scope…is inside the function.…Remember functions do define scope,…locks don't define scope, functions do.…
- 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
Python: Programming Efficiently (2017)with Michele Vallisneri2h 15m Intermediate
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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