Python-3-Object-Oriented-Programming
kandi X-RAY | Python-3-Object-Oriented-Programming Summary
kandi X-RAY | Python-3-Object-Oriented-Programming Summary
Python-3-Object-Oriented-Programming
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- Collect all links
- Appends an integer to the list
- Set the key s value
- Normalize url
- Add a new property
- Get a valid input
- Display the menu
- Displays the menu
- Modify a note
- Find note by id
- Process the given string into a Node
- Calculate age
- Small division function
- Process a comment
- Modify tags of a note
- Prints a function
- Search all contacts with given name
- Add a user to the set
- Simple division function
- Format currency
- Decorator to log function calls
- Format a string
- Format a currency
- Replace all files in the temp directory
- Get the inbox from the IMAP server
- List of available modes
Python-3-Object-Oriented-Programming Key Features
Python-3-Object-Oriented-Programming Examples and Code Snippets
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Trending Discussions on Python-3-Object-Oriented-Programming
QUESTION
I'm going through a Python OOPs book by Dusty Phillips. I fail to understand a particular program in the book, chapter 7 - Python Object-oriented Shortcuts. The extended version of the code is available here
Although the program comes under the topic Functions are objects too, the provided program also uses a strange code, which i feel, more of imply the opposite (using objects as functions).
I have pointed out the line in the code where i have the doubt. How is that variable callback
of TimedEvent
used like a function Timer
class ? What is going on here in this part.
ANSWER
Answered 2020-Jul-30 at 17:53Both are true
- functions are objects: do a
dir(f)
on a function to view its attributes - objects can be used as functions: just add
__call__(self, ...)
method and use the object like a function.
In general things that can be called using a syntax like whatever(x, y, z)
are called callables.
What the example is trying to show is that methods are just object attributes that are also callables. Just like you can write obj.x = 5
, you can also write obj.f = some_function
.
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You can use Python-3-Object-Oriented-Programming like any standard Python library. You will need to make sure that you have a development environment consisting of a Python distribution including header files, a compiler, pip, and git installed. Make sure that your pip, setuptools, and wheel are up to date. When using pip it is generally recommended to install packages in a virtual environment to avoid changes to the system.
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