Queue is a very practical data structure. It’s normally compared with stack, array, linked list, and other linear data structures. What makes a linear structure differs from another is where additions and removals occur.
Queue data structure has three types: FIFO, LIFO, and Priority Queue. The queue module in Python implements all of these types. Besides, it’s extremely useful in thread programming as well which makes this module even more shining.
In this article, I will first help you refresh knowledge on the data structures and learn how to use module
queue. Then I will show you how to use
queue to solve 2 different multi-threading problems. In the end, I will talk about the pros and cons of this module.
Before moving to some of the advanced features, let’s talk a bit about the queue data structure and learn how to use the module to create a “simple” queue.
FIFO — First in, First out
This is the basic type of queue. Elements inserted first will be removed first, which works like a waiting list in the real world. The earlier you are added to the list, the earlier you will get the concert ticket.
The Python module provides
queue.SimpleQueue() that implements a FIFO queue.
queue.SimpleQueue() is a new feature in Python 3.7. There are 2 differences between them:
SimpleQueue()doesn’t do task tracking in the thread programming. Thread programming will be discussed later.
SimpleQueue()is an unbounded FIFO queue while
Queue()can have an upper bound. In both classes, if the queue is empty,
get()operation will be blocked until new elements are inserted. In
Queue(), if the queue is full, the
put()operation will be blocked as well until elements are removed. This will never happen to
SimpleQueue(). According to Python doc, it’s possible to disable the block using
put(), then you will receive a
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Welcome to my Blog , In this article, you are going to learn the top 10 python tips and tricks.
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Welcome to my blog, In this article, we will learn the top 20 most useful python modules or packages and these modules every Python developer should know.
Hello everybody and welcome back so in this article I’m going to be sharing with you 20 Python modules you need to know. Now I’ve split these python modules into four different categories to make little bit easier for us and the categories are:
Near the end of the article, I also share my personal favorite Python module so make sure you stay tuned to see what that is also make sure to share with me in the comments down below your favorite Python module.
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Welcome to my Blog, In this article, we will learn python lambda function, Map function, and filter function.
Lambda function in python: Lambda is a one line anonymous function and lambda takes any number of arguments but can only have one expression and python lambda syntax is
Syntax: x = lambda arguments : expression
Now i will show you some python lambda function examples:
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Module: It is a simple Python file that contains collections of functions and global variables and has a “.py” extension file. It’s an executable file and we have something called a “Package” in Python to organize all these modules.
Package: It is a simple directory which has collections of modules, i.e., a package is a directory of Python modules containing an additional init.py file. It is the init.py which maintains the distinction between a package and a directory that contains a bunch of Python scripts. A Package simply is a namespace. A package can also contain sub-packages.
When we import a module or a package, Python creates a corresponding object which is always of type module . This means that the dissimilarity is just at the file system level between module and package.
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A queue is a linear data structure that follows the First In First Out (FIFO) principle. That means the first element that is added to the queue is the first one to be removed. It has similarities to stack. Often queue and stack are studied together. But to keep things simple and short I decided to write two separate articles on them. Here is my article on how to create a stack in Python:
But in this article, we will learn how to create a queue. Let’s get started!
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