Elton  Bogan

Elton Bogan

1596787020

Live from the Manning Python Conference

HTML to Markdown

Introduction

In the previous post we saw how a Go service can call a Python service using gRPC. Using gRPC to connect a Go and Python program together can be a great choice, but there’s a complexity price that goes with it. You need to manage one more service, deployment becomes more complex, and you need monitoring plus alerting for each service. Compared to a monolithic application, there is an order of magnitude more complexity.

In this post, we’re going to reduce the complexity of using gRPC by writing a shared library in Go that a Python program can consume directly. With this approach, there’s no networking involved and depending on the data types, no marshalling as well. Out of the several approaches of calling functions from a shared library in Python, we decided to use Python’s ctypes module.

Note: ctypes uses libffi under the hood. If you want to read some really scary C code - head over to the repo and start reading. :)

I’ll also show my workflow that is one of the big factors in my productivity. We’ll first write “pure” Go code, then write code to export it to a shared library. Then we’ll switch to the Python world and use Python’s interactive prompt to Play around with the code. Once we’re happy, we’ll use what we’ve learned in the interactive prompt to write a Python module.

Example: Checking the Digital Signature of Several Files in Parallel

Imagine you have a directory with data files, and you need to validate the integrity of these files. The directory contains a sha1sum.txt file with a sha1 digital signature for every file. Go, with its concurrency primitives and ability to use all the cores of your machine, is much better suited to this task than Python.

Listing 1: sha1sum.txt

6659cb84ab403dc85962fc77b9156924bbbaab2c  httpd-00.log
5693325790ee53629d6ed3264760c4463a3615ee  httpd-01.log
fce486edf5251951c7b92a3d5098ea6400bfd63f  httpd-02.log
b5b04eb809e9c737dbb5de76576019e9db1958fd  httpd-03.log
ff0e3f644371d0fbce954dace6f678f9f77c3e08  httpd-04.log
c154b2aa27122c07da77b85165036906fb6cbc3c  httpd-05.log
28fccd72fb6fe88e1665a15df397c1d207de94ef  httpd-06.log
86ed10cd87ac6f9fb62f6c29e82365c614089ae8  httpd-07.log
feaf526473cb2887781f4904bd26f021a91ee9eb  httpd-08.log
330d03af58919dd12b32804d9742b55c7ed16038  httpd-09.log

Listing 1 shows an example of a digital signature file. It provides hash codes for all the different log files contained in the directory. This file can be used to verify that a log file was downloaded correctly or has not been tampered with. We’ll write Go code to calculate the hash code of each log file and then match it against the hash code listed in the digital signature file.

To speed this process up, we’ll calculate the digital signature of each file in a separate goroutine, spreading the work across all of the CPUs on our machine.
1
Michael #1: VS Code Device Simulator
2

3

  • Want to experiment with MicroPython?
    4
  • Teaching a course with little IoT devices?
    5
  • Circuit Playground Express
    6
  • BBC micro:bit
    7
  • Adafruit CLUE with a screen
    8
  • Get a free VS code extension that adds a high fidelity simulator
    9
  • Easily create the starter code (main.py)
    10
  • Interact with all the sensors (buttons, motion sensors, acceleration detection, device shake detection, etc.)
    11
  • Deploy and debug on a real device when ready Example of it running on a CLUE
    12
  • Had the team over on Talk Python.
    13

    14
    Brian #2: pytest 6.0.0rc1
    15

    16
  • New features
    17
  • You can put configuration in pyproject.toml
    18
  • Inline type annotations. Most user facing API and internal code.
    19
  • New flags - --no-header - --no-summary - --strict-config : error on unknown config key - --code-highlight : turn on/off code highlighting in terminal
    20
  • Recursive comparison for dataclass and attrs
    21
  • Tons of fixes
    22
  • Improved documentation
    23
  • There’s a list of breaking changes and deprications. But really, nothing in the list seems like a big deal to me.
    24
  • Plugin authors, including myself, should go test this.
    25
  • Already found one problem. pytest-check: stop on fail works fine, but failing tests marked with xfail show up as xpass. Gonna have to look into that. And might have to recruit Anthony to help out again.
    26
  • To try it: pip install pytest==6.0.0rc1
    27
  • I’m currently running through the pytest book to make sure it all still works with pytest 6. So far, so good.
    28
  • The one hiccup I’ve found so far, TinyDB had a breaking change with 4.0, so you need to pip install tinydb==3.15.2 to get the tasks project to run right. I should have pinned that in the original setup.py.
    29
  • However, all of the pytest stuff is still valid.
    30
  • Guido just tweeted: “Yay type annotations in pytest!”

#python

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Live from the Manning Python Conference
Ray  Patel

Ray Patel

1619510796

Lambda, Map, Filter functions in python

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:

#python #anonymous function python #filter function in python #lambda #lambda python 3 #map python #python filter #python filter lambda #python lambda #python lambda examples #python map

Shardul Bhatt

Shardul Bhatt

1626775355

Why use Python for Software Development

No programming language is pretty much as diverse as Python. It enables building cutting edge applications effortlessly. Developers are as yet investigating the full capability of end-to-end Python development services in various areas. 

By areas, we mean FinTech, HealthTech, InsureTech, Cybersecurity, and that's just the beginning. These are New Economy areas, and Python has the ability to serve every one of them. The vast majority of them require massive computational abilities. Python's code is dynamic and powerful - equipped for taking care of the heavy traffic and substantial algorithmic capacities. 

Programming advancement is multidimensional today. Endeavor programming requires an intelligent application with AI and ML capacities. Shopper based applications require information examination to convey a superior client experience. Netflix, Trello, and Amazon are genuine instances of such applications. Python assists with building them effortlessly. 

5 Reasons to Utilize Python for Programming Web Apps 

Python can do such numerous things that developers can't discover enough reasons to admire it. Python application development isn't restricted to web and enterprise applications. It is exceptionally adaptable and superb for a wide range of uses.

Robust frameworks 

Python is known for its tools and frameworks. There's a structure for everything. Django is helpful for building web applications, venture applications, logical applications, and mathematical processing. Flask is another web improvement framework with no conditions. 

Web2Py, CherryPy, and Falcon offer incredible capabilities to customize Python development services. A large portion of them are open-source frameworks that allow quick turn of events. 

Simple to read and compose 

Python has an improved sentence structure - one that is like the English language. New engineers for Python can undoubtedly understand where they stand in the development process. The simplicity of composing allows quick application building. 

The motivation behind building Python, as said by its maker Guido Van Rossum, was to empower even beginner engineers to comprehend the programming language. The simple coding likewise permits developers to roll out speedy improvements without getting confused by pointless subtleties. 

Utilized by the best 

Alright - Python isn't simply one more programming language. It should have something, which is the reason the business giants use it. Furthermore, that too for different purposes. Developers at Google use Python to assemble framework organization systems, parallel information pusher, code audit, testing and QA, and substantially more. Netflix utilizes Python web development services for its recommendation algorithm and media player. 

Massive community support 

Python has a steadily developing community that offers enormous help. From amateurs to specialists, there's everybody. There are a lot of instructional exercises, documentation, and guides accessible for Python web development solutions. 

Today, numerous universities start with Python, adding to the quantity of individuals in the community. Frequently, Python designers team up on various tasks and help each other with algorithmic, utilitarian, and application critical thinking. 

Progressive applications 

Python is the greatest supporter of data science, Machine Learning, and Artificial Intelligence at any enterprise software development company. Its utilization cases in cutting edge applications are the most compelling motivation for its prosperity. Python is the second most well known tool after R for data analytics.

The simplicity of getting sorted out, overseeing, and visualizing information through unique libraries makes it ideal for data based applications. TensorFlow for neural networks and OpenCV for computer vision are two of Python's most well known use cases for Machine learning applications.

Summary

Thinking about the advances in programming and innovation, Python is a YES for an assorted scope of utilizations. Game development, web application development services, GUI advancement, ML and AI improvement, Enterprise and customer applications - every one of them uses Python to its full potential. 

The disadvantages of Python web improvement arrangements are regularly disregarded by developers and organizations because of the advantages it gives. They focus on quality over speed and performance over blunders. That is the reason it's a good idea to utilize Python for building the applications of the future.

#python development services #python development company #python app development #python development #python in web development #python software development

Art  Lind

Art Lind

1602968400

Python Tricks Every Developer Should Know

Python is awesome, it’s one of the easiest languages with simple and intuitive syntax but wait, have you ever thought that there might ways to write your python code simpler?

In this tutorial, you’re going to learn a variety of Python tricks that you can use to write your Python code in a more readable and efficient way like a pro.

Let’s get started

Swapping value in Python

Instead of creating a temporary variable to hold the value of the one while swapping, you can do this instead

>>> FirstName = "kalebu"
>>> LastName = "Jordan"
>>> FirstName, LastName = LastName, FirstName 
>>> print(FirstName, LastName)
('Jordan', 'kalebu')

#python #python-programming #python3 #python-tutorials #learn-python #python-tips #python-skills #python-development

Art  Lind

Art Lind

1602666000

How to Remove all Duplicate Files on your Drive via Python

Today you’re going to learn how to use Python programming in a way that can ultimately save a lot of space on your drive by removing all the duplicates.

Intro

In many situations you may find yourself having duplicates files on your disk and but when it comes to tracking and checking them manually it can tedious.

Heres a solution

Instead of tracking throughout your disk to see if there is a duplicate, you can automate the process using coding, by writing a program to recursively track through the disk and remove all the found duplicates and that’s what this article is about.

But How do we do it?

If we were to read the whole file and then compare it to the rest of the files recursively through the given directory it will take a very long time, then how do we do it?

The answer is hashing, with hashing can generate a given string of letters and numbers which act as the identity of a given file and if we find any other file with the same identity we gonna delete it.

There’s a variety of hashing algorithms out there such as

  • md5
  • sha1
  • sha224, sha256, sha384 and sha512

#python-programming #python-tutorials #learn-python #python-project #python3 #python #python-skills #python-tips

How To Compare Tesla and Ford Company By Using Magic Methods in Python

Magic Methods are the special methods which gives us the ability to access built in syntactical features such as ‘<’, ‘>’, ‘==’, ‘+’ etc…

You must have worked with such methods without knowing them to be as magic methods. Magic methods can be identified with their names which start with __ and ends with __ like init, call, str etc. These methods are also called Dunder Methods, because of their name starting and ending with Double Underscore (Dunder).

Now there are a number of such special methods, which you might have come across too, in Python. We will just be taking an example of a few of them to understand how they work and how we can use them.

1. init

class AnyClass:
    def __init__():
        print("Init called on its own")
obj = AnyClass()

The first example is _init, _and as the name suggests, it is used for initializing objects. Init method is called on its own, ie. whenever an object is created for the class, the init method is called on its own.

The output of the above code will be given below. Note how we did not call the init method and it got invoked as we created an object for class AnyClass.

Init called on its own

2. add

Let’s move to some other example, add gives us the ability to access the built in syntax feature of the character +. Let’s see how,

class AnyClass:
    def __init__(self, var):
        self.some_var = var
    def __add__(self, other_obj):
        print("Calling the add method")
        return self.some_var + other_obj.some_var
obj1 = AnyClass(5)
obj2 = AnyClass(6)
obj1 + obj2

#python3 #python #python-programming #python-web-development #python-tutorials #python-top-story #python-tips #learn-python