1. Python Basics


 

ROSSUM'S  PYTHON

 

Intro:

Python is a high-level programing language, high-level programing language means it’s programmer-friendly language and we can write the program very easily.

Ex:

a =10

b= 20

c = 30 if a>b else 40

print (c)

Result: 40

Python program file extension is .py, its general-purpose programing language also. It means we can use this language in general domains like desktop applications, web applications, machine learning, and more.

The creator of python is… Guido van Rossum

More details of Rossum with personal resume.

(See also my publications list and my personal home page.)

Current

Distinguished Engineer in the Developer Division at Microsoft, since November 2020.

From October 2019 till October 2020 I was retired.

Previous Work in the US

From January 2013 through October 2019, I worked for Dropbox, where most recently I worked on mypy and on migrating over 5 million lines of server-side code from Python 2 to Python 3.

From December 2005 till December 2012, I worked for Google. My first project was an internal code review tool, Mondrian. After that, I worked on the App Engine project, where I worked on the Admin Console, the Appstats library, the NDB library, and created an open-source code review tool, Rietveld.

From July 2003 till December 2005, I worked for Elemental Security, founded by Dan Farmer, as Senior Language Architect. The one thing I built here that had a lasting effect was a Python version of pgen, Python's parser generator, now immortalized in the Python standard library is lib2to3/pgen2/.

From October 2000 till July 2003, I worked for Zope Corporation as Director of PythonLabs.

From May through October 2000, I worked for BeOpen.com as Director of PythonLabs.

From April 1995 to February 1998, I was a guest researcher for the U.S. National Institute of Standards and Technology (NIST) in Gaithersburg, Maryland, working at the Corporation for National Research Initiatives (CNRI) in Reston, Virginia. From March 1998 to May 2000 I was an employee of CNRI doing essentially the same work. The research was on mobile agents in distributed systems using interpreted languages. Most of the work involved Python, an interpreted, object-oriented programming language of my own invention. As an elaborate example, I wrote Grail, the first web browser written in Python. During this time I also wrote a funding proposal, Computer Programming for Everybody, that was funded by DARPA.

From mid-October till mid-December 1994 I was a guest researcher at NIST, working on Python. NIST sponsored my visit to the Usenix Symposium on Very High-Level Languages in Santa Fe and organized the First Python Workshop.

Previous Work outside the US

From 1991 till 1995 I worked in the multimedia group at CWI, headed by Dick Bulterman. The group was working on authoring software for hypermedia presentations (both implementations and theoretical models) and on the operating system and network support for multimedia and hypermedia, in particular synchronization of independent streams. They maintained a directory containing a compressed Postscript of publications by the group. Most of the group's implementation work (even after my departure) was done in Python.

Older Projects

I was involved in several other projects at CWI:

From 1977 till 1982 I worked part-time for SARA.

Education

I received a Master's degree in Mathematics and Computer Science from the University of Amsterdam in 1982, and joined CWI as a researcher in the same year. While studying, I worked for 5 years as a systems programmer at Amsterdam's academic computer center, SARA.

Awards

In November 2019 I was awarded the first Dijkstra Fellowship by CWI.

In October 2018 I was one of the five recipients of the first annual Oracle Groundbreaker Awards.

Since October 2018 I am an IEEE Senior member. (But they don't give senior discounts. :-)

In April 2018 I was entered into the Computer Museum's Hall of Fellows.

In June 2013 Python won the highly competitive Dutch COMMIT/ Award.

In July 2007 I was awarded the USENIX STUG Award.

In October 2006 I was elected ACM Distinguished Engineer.

In June 2003 I was a finalist in the category "IT - Software (Individual)" of the World Technology Network awards.

In May 2003 I received the NLUUG Award 2003 for extraordinary services to the community of users of Unix and Open Systems.

In February 2002 I received the Free Software Foundation Award.

In May 1999 I received the Dr. Dobb's Journal 1999 Excellence in Programming Award, together with Donald Becker.


Guido van Rossum

 

Python came in 1989 while working national research institute in Netherland. Python is publicly available on FEB 2oth 1991.

 Python Special Features:

It’s simple and easy to understanding and easy to coding.

It’s very little code compared to other languages

It’s best suitable for future and powerful applications like Artificial Intelligence, Machine Learning, Deep Learning, Natural Networking, Data Science, Internet of Things, etc.

It’s best suitable for beginners and anyone can learn python, no previous coding knowledge is required. In my knowledge for learning python BASIC ENGLISH, BASIC MATHS, LOGICAL THINKING is required. Just take a look (hello world) program other languages and python, so that we can understand more clearly. how simple it is, check the simple hello world program.

In C

#include <stdio.h>

int main(void){

    printf("Hello, world!\n");

    return 0;

}

In java

public class HelloWorld

   {

        public static void main(String[] args)

        {

             System.out.println("Hello, world!");

        }

   }

In python just one line


print("Hello, world!")


now we are checking one more example and adding two numbers.

in C

#include<stdio.h>

int main()

{

   int a = 1, b = 2;

   a = a + b;

   printf("Sum of a and b = %d\n", a);

  return 0;

}

In Java

class AddNumbers

{

   public static void main(String args[])

   {

      int x, y, z;

       System.out.println("Enter two integers to calculate their sum");

      Scanner in = new Scanner(System.in);

       x = in.nextInt();

      y = in.nextInt();

      z = x + y;

     System.out.println("Sum of the integers = " + z);

   }

}

In python.. just like normal maths

a = 4

b = 6

c = a+b

print('The sum of c:',a+b)

in these examples, we can easily understand how much easy it is. Now one more point we need to notice is that variable before in c and java, we added (int) typecasting with a value a & b. But in python, we have not added any (int) like typecasting. In c and java, it’s mandatory otherwise program can’t run, but in python, it’s not mandatory it’s automatically finding the typecasting, based on a given value. If we are given the typecasting before the variable like (int) there is no issue, and it’s one hundred percent accepted. No errors are coming. This type of behavior is called dynamic type programing language.

Ex: python, javascript.

If we compulsory add typecasting before the variable like (int), this type is called static type programming language.

Ex: C, C++,Java

In python, type of variable automatically detect the typecasting, and it has an option for checking.

a = 10

print(type(a))

result: <class 'int'>

a = 10.5

print(type(a))

<class 'float’>   #result

a = True

print(type(a))

<class 'bool’>   #result

next point, in c or java if we assign the value like (a=10) the total program the value 10 only, we can’t change the value. If we are trying to change the value in within the program it’s giving the error.

In python, we can change the value n number of times. But the program only takes the latest given value only.

Python is easier and more fixable, we can change the program variables data within the program. This is another benefit of dynamic type programing language. This helps the programmer be more friendly and easily.

 Python name:

Rossum watched one comedy show name is ‘The Complete Monty Python’s Circus’  the comedy show on the BBC channel from 1969 to 1974. Rossum was very interested in watching this show. That’s why he takes the name for his programing software called PYTHON.

Not even python language other languages like java and Hadoop have this type of real stories are there. Take a look at Google.

Rossum python is more powerful compared to other languages.

He collected some special futures from other languages put into python. Like from C functional futures, from java object-oriented program futures, from shell script scripting type, from modular-3 modular type futures like all futures put into python and make powerful and smart language.

Python most of the syntax looks like C and ABC language.

Using area of Python:

1. Web Development:

Python can make web applications at a rapid speed. It is because of the frameworks. Python uses to create these applications. There is common-backend logic that goes into making these frameworks and a number of libraries that can help integrate protocols such as HTTPS, FTP, SSL, etc. and even help in the processing of JSON, XML, E-Mail and so much more.

Some of the most well-known frameworks are Django, Flask, Pyramid. This framework uses security, scalability, convenience that they provide is commendable and programmer-friendly.

2. Game Development:

Python is also used in the development of interactive games. There are libraries such as PySoy is a 3D game engine supporting Python 3, PyGame which provides functionality, and a library for game development. Games such as Civilization-IV, Disney’s Toontown Online, Vega Strike, etc. have been built using Python.

3. Machine Learning and Artificial Intelligence:

Machine Learning and Artificial Intelligence are the talks of the town as they yield the most promising careers for the future. We make the computer learn based on past experiences through the data stored or better yet, create algorithms that make the computer learn by itself. It’s Support for these domains with the libraries that exist already such as Pandas, Scikit-Learn, NumPy and so many more.

4. Data Science and Data Visualization:

Data is money if you know how to extract relevant information which can help you take calculated risks and increase profits. You study the data you have, perform operations and extract the information required. Libraries such as Pandas, NumPy helps you in extracting information.

You can even visualize the data libraries such as Matplotlib, Seaborn, which are helpful in plotting graphs, and much more. This is what Python offers you to become a Data Scientist.

5. Desktop GUI:

We use Python to program desktop applications. It provides the Tkinter library that can be used to develop user interfaces. There are some other useful toolkits such as the wxWidgets, Kivy, PYQT that can be used to create applications on several platforms.

You can start out by creating simple applications such as Calculators, To-Do apps and go ahead and create much more complicated applications.

6. Web Scraping Applications:

Python is a savior when it comes to pulling a large amount of data from websites which can then be helpful in various real-world processes such as price comparison, job listings, research and development, and much more.

7. Business Applications:

Business Applications are different than our normal applications covering domains such as e-commerce, ERP, and many more. They require applications that are scalable, extensible, and easily readable and Python provides us with all these features. Platforms such as Tryton is available to develop such business applications.

8. Audio and Video Applications:

We use Python to develop applications that can multi-task and also output media. Video and audio applications such as TimPlayer, Cplay have been developed using Python libraries. They provide better stability and performance in comparison to other media players.

9. CAD Applications:

Computer-Aided Designing is quite challenging to make as many things have to be taken care of. Objects and their representation, functions are just the tip of the iceberg when it comes to something like this. Python makes this simple too and the most well-known application for CAD is Fandango.

 10. Embedded Applications:

Python is based on C which means that it can be used to create Embedded C software for embedded applications. This helps us to perform higher-level applications on smaller devices that can compute Python.

The most well-known embedded application could be the Raspberry Pi which uses Python for its computing. We can also use it as a computer or as a simple embedded board to perform high-level computations.

Companies Using Python

1. Google

Python has been an important part of Google since the beginning and remains so as the system grows and evolves. Today dozens of Google engineers use Python, and we’re looking for more people with skills in this language.


2. Facebook

As the first-ever social media platform that stirred up the competition and rose to the top, Facebook has evolved significantly, and part of the reason behind this is the adoption of Python in its technology stack. Facebook uses many Python packages in several areas, such as:

● TORconfig, FBOSS, FBAR, Cyborg, machine checker, for Production Engineering

● Job Engine, fbpkg, FBTFTP, Osmosis, for Platform Services

● Configurator, for Service Configuration Management

● MySQL Pool Scanner, slow roll orchestrator, for managing Operational Efficiency

Facebook also actively takes part in the development of Python by regularly contributing to the platform with bug fixes and additional features for enhanced performance. Other languages used in Facebook’s technology stack include PHP and C++.

3. Instagram

InstagramPopular photo and video sharing platform

An immensely popular photo and video sharing platform, Instagram use Python to achieve maximum operational efficiency using a famous Python framework, Django. Considered as the largest implementation of Django yet, the motivation behind this was the simplicity and the reliability of the framework.

The developers at Instagram also seem to favor Python over PHP when it comes to choosing their preferred baseline programming language as the performance gains with PHP just weren’t compelling enough.

The company even made the switch from Python 2 to Python 3 over a 10-month long period, this clearly shows that Instagram is very impressed with Python.

4. Spotify

SpotifyGo-to music streaming app

Spotify is the go-to music streaming app for millions of people due to its widespread availability and an astounding collection of music for all your moods. Python is being used extensively by Spotify for numerous reasons including, data analysis, inter-service communication using ZeroMQ, and more.

With the wealth of data, Spotify manages its recommendation system with the vast amounts of collected data using Hadoop, and it is processed in conjunction with Luigi, a python package for batch processing jobs. Another reason for adopting Python over others is the rapid development pipeline and how seamlessly services operate with each other.

5. Quora

QuoraPopular question and answer platform

Quora is a popular question-and-answer platform where every day, hundreds of questions are being posted, garnering replies from some of the brightest people out there. Quora adopted Python for its efficient and speedy nature, with the added benefit of ease of use. Quora uses the Tornado framework, pypy, and many more python libraries. Quora circumvented the type checking shortcoming of Python by writing thorough unit tests.

Benefits such as reduced development time, enhanced scalability, developer-friendliness with better code readability, and the availability of plenty of libraries assured them and turned their attention towards Python, from the other two potential candidates including C#, Java, and Scala.

6. Netflix

NetflixVideo streaming giant

The widely popular video streaming giant Netflix is particularly fond of Python and tries to use it as much as it can. From its early days, Netflix has been very open about how they use Python and other libraries. The implementation of Python can be found in almost every sub-system, such as:

● Security: A suite of tools called the Simian Army simulates failures and tests the reliability of the system, helping plan recovery measures for system failures.

● Alerts: Central Alert Gateway communicates all alerts to suitable teams.

● Data Analysis: Libraries like NumPy, SciPy to perform numerical data analysis.

7. Dropbox

DropboxOnline file-sharing and storage company

Python is the life force behind the online file-sharing and storage company Dropbox powering most of its services and its desktop client. Dropbox was so impressed with Python they managed to get Guido van Rossum, the creator of Python, from Google and onboard the Dropbox team to improve their platform.

Although proprietary, the company also offers a Python SDK to developers, looking to integrate it into their Python app, giving you an idea of how much they are invested in the platform. The developers at Dropbox also confirm that most of the server-side code is written using Python.

8. Reddit

Considered as one of the largest microblogging websites and the self-proclaimed first page of the internet, Reddit is your place if you want to gather information about anything, with millions of users and billions of topics.

Reddit takes a lot of inspiration from Python and its wide collection of libraries by gradually implementing a highly customized variant of each adopted library. At its core, Reddit uses the following libraries to keep its services running:

● baseplate.py: As the core services framework in Python

● rollingpin: To facilitate faster deployment to various servers

● pywebpush: The Web push data encryption in Python

● AWS-MFA: For managing the AWS Multi-Factor Authentication

● monitors: To monitor all the operations

● gevent: To manage coroutine-based concurrency

● Django-underpants: Helpers integrating Django to underpants

● and many more libraries

9. Amazon

AmazonOne of the top players in the online marketplace

One of the top players in the online marketplace, Amazon, uses Python in several areas of its platform. Implemented in the product and deals recommendation system wherewith Artificial Intelligence and Machine Learning, Amazon analyzes the customer’s buying and habits and recommends products.

As Amazon deals with humungous amounts of data, technology to manage that data was required, and that’s where Python came in with its high scalability and the ability to work seamlessly with other technologies such as Hadoop.

Another instance of Amazon using Python is the Jupyter notebooks for various use cases, even involving Machine Learning and automation in the AWS resources.

10. Uber

UberA Ride booking multinational company

Uber, a multinational company that lets you book rides to your favorite destinations, uses Python along with Node.js, Java, and Go at the lower levels. Most of the services for its users are still powered by Python, including the business logic and all the calculations that take place, including the middle and top levels, such as calculating ETA, ride fares, calculating geo-locations, and the demand and supply.

Uber claims to use Tornado with Python but often exchanges that with Go, to achieve better throughput in terms of concurrency. Uber also develops frameworks for visualizations that Python, as well as R and Shiny, make use of, and uses Jupyter notebooks for all its data analysis tasks.

Special Features of Python

1. Simple and easy to learn

Python has only 35 keywords, if we compare it to other languages it’s very few. So that we can learn faster and easier. Starting time we already sea the python program it just looks like an English statement, is easy to read, and has very little code compared to other languages. So that it has a varied fast compiling process. For example, we have one data file and we want to show the console that data. In this task, if we use c, java it’s pity a lengthy program but in python, it’s only one line.

print(open(‘data.txt’).read())

2. Freeware and open source

It’s totally free and we can use any type of application without any purchasing or licensing issues. It’s open-source it means anyone can take the source code and modified according to our application and that source code name change it as you like.

Ex ..Jython, IronPython, etc.

3. High-level programing language

It means it’s a programmer-friendly language and it can code and understand easily.

a=10

b=20

print (a+b)

result:30

 

low-level activities like memory management, object distraction, free space allocation, and all take cake by python PVM. PVM means python virtual machine.

4. Platform Independent

Someone told that 'Write once and run anywhere' this is a java slogan.. but it’s a python slogan because the python program is older than the java program.

If we need to test all platforms in our new software, based on python code. If this new software is written in other languages like c or c++ we need to change according to the platform. But python-based software easily runs all platforms without any changes support with PVM but PVM is different based on the platform. Once we go to install python in our system it has an option on the python.org website if we are installing windows or Linux. so python windows PVM and Linux PVM both are different. This type of future is called platform-independent. If we need the change our code platform-based then it’s called platform-dependent.

5. Portability

Portability means we can move the object from one place to another place easily. Just like our python-based software can move from one platform to another platform (OS).without any changes. This is called portability.

6. Dynamically typed

In other languages like c,c++, java we must assign the typecasting before the variable declaration. If we do not assign typecasting before the variable then the program gives the error. This type of program is called static type programing language

ex:      int a=10..ok

            int b=20…ok

            a = 30…. Not ok it’s giving the error.

but python does not need to assign typecasting before the variable. Python program automatically detects the typecasting based on a given value. If we are given the typecasting then also no issues. It’s perfectly working our program with both conditions.

Ex:      a = 10 …ok

            int b =20…ok

this type of nature is called dynamically type programing language. And we can check what type of variable python was taken with help of the type() function.

Ex:                              a = 10

                                    print(type(a))

                                    output: <class ‘int’>

in dynamically typed language we can change the assigned value n number of times and there is no issue and a program runs without any error.

Ex:      n = 5

n = n + 1

n = n + 1

print (n)

                7         #Result

so n value automatically changes and gives perfect output without any error.

In the static type of programming languages can’t run this program. It’s given an error.

7. Procedural and Object-Oriented

In 'C' we can do only procedural the oriented program, in 'java' can do the only object-oriented program but python can do Procedural and Object-Oriented programs, scripting type, modular type, and much more can do support with python frameworks.

8. Interpreted Language

Python is not required to compile for executing the program, in the 'C' language needs to compile and execute the program, in the 'java' language, needs to compile and execute the program. In python just runs the program only. Internally PVM line by line compiles our program without our knowledge. Once we run the program it shows the result.

9. Extensible

Extensible means you can write your Python code modules in other languages like C or C++. It means that it can be extended to other languages which makes python an extensible language. It's not extending the language itself (syntax, constructs, etc), but we can python libraries to be written in other languages support with Python API.

10. Embeddable

The previous feature was discussed about the extensibility of python. it's exactly the opposite. However embeddable means that it is also possible to write your python code in a source code in different languages like C, C++, JAVA, etc. This allows developers to integrate scripting capabilities into programs written in another language.

11. Extensive Library

Python supports a large set of libraries and provides thousands of functionalities to the developer for developing successful applications. This is one of the major reasons why python becomes popular among the programming community. Nowadays a lot of researchers use python language for their scientific programming.

12. GUI supported

Python supports a huge number of GUI frameworks (or toolkits). Graphical User Interfaces(GUI) can be developed using Python. For this purpose, we use python libraries such as PyQT, Tkinter, Pygame and pyFLTK are some GUI libraries which are really popular among python application developers.

Some Limitations of Python:

1. Performance and Speed

Many programmers have proved that Python is slower than other modern programming languages like Java and C++. So the developers have to frequently explore ways to enhance the Python application’s speed. However, they have a number of options to make the applications written in Python run faster. For instance, the developers can create a custom runtime, and use it instead of the default runtime of the programming language. Likewise, they can rewrite the existing Python code to take advantage of the existing execution speed.

2. Incompatibility of Two Versions

Beginners learn Python 3 only. Officially, Python 2. x is described as legacy, whereas Python 3.x is described as current and futuristic. But both versions of the programming language have been updated on a regular basis. Also, a large percentage of programmers still prefer Python 2 to Python 3. There is a number of popular frameworks and libraries that support Python 2 and 3 also.

3. Depends on Third-Party Frameworks and Libraries

Python lacks a number of features provided by other modern programming languages. So the programmers have to use a number of third-party frameworks and tools to build web applications and mobile apps in Python. However, they need to use open-source frameworks and libraries to avoid increasing project overheads. The cost factor restricts the developers from availing of the advanced features and functionality provided by commercial frameworks.

4. Many Python Modules Lack of Support

Python is supported by a large and active community. The members of the Python community regularly share new packages or modules to make it easier for programmers to add functionality to the application. But developers often complain that the quality of individual Python modules or packages differs. Some of these packages lack adequate support and are not updated regularly. Hence, the programmers have to do some initial research to pick the right packages or modules.

5. Weak in Mobile Computing

Python developers cannot use Python directly for developing mobile apps by targeting any popular mobile platforms. They have to use frameworks like Kivy to build cross-platform mobile apps using Python.

6. Requires Additional Testing

Python is a dynamically typed programming language. It does not require programmers to define the type of a variable while declaring it. The feature makes it easier for programmers to write code freely. But a number of critical bugs or defects emerge at the time of compilation as the variable types are not defined explicitly. So the developers must perform a number of tests additionally to identify and fix the bugs during runtime.

Flavors of Python

Types of Python compilers are referred to as flavors of Python. They help to integrate various types of programming languages in Python some of them are:

1. CPython

It is a Python compiler that was implemented in the C language. Even C++ code can be executed using CPython.

2. JPython

It enables Python implementation to be run on the Java platform. It runs on JVM.

3. IronPython

It is a compiler designed for the .NET framework, but it is written in C#. It can run on CLR(Common Language Run time).

4. PyPy

It is a Python implemented by using Python language itself. It runs fast since JIT is incorporated into PVM.

5. Ruby Python

It acts as a bridge from Ruby to Python interpreter. It embeds the Python interpreter inside the Ruby application

6. Pythonxy

It is written in the form of Python(X, Y). It is designed by adding scientific and engineering-related packages.

7. Anaconda Python

The name Anaconda Python is obtained after redeveloping it to handle large-scale data processing, predictive analytics, and scientific computing. It handles a huge amount of data.

8. Stackless Python

Tasklets are small tasks that are run independently. The communication is done with each by using channels. They schedule, control, and suspend the tasklets. Hundreds of tasklets can run by a thread. The thread and tasklets can be created in stackless python. It is a re-implementation of python.

PYTHON INSTALLATION:

Nowadays all are using the python 3 versions only, it’s available on the python.org website, go to this website and click the download tab and you can see source code, windows, mac os, and other platforms. Just click based on your system OS, after that its shows all versions with notes. Download the latest version of python. The latest version is the best choice. Just install the python. In this process, we must select the ‘add python 3.x to PATH’ otherwise we have to add manually, and sometimes it may not work. Because admin rights like some issues came into the picture. Once installation is done, open the command prompt, and type the ‘python’ it’s will show below

Python 3.8.5 (tags/v3.8.5:580fbb0, Jul 20 2020, 15:43:08) [MSC v.1926 32 bit (Intel)] on win32

Type "help", "copyright", "credits" or "license" for more information.

>>> 

It means python was installed successfully.

If not showing then uninstall and reinstall with activate path.

Next, we need to install the IDE. Pycharm is the best choice for python.

I am always using Pycharm for python coding..it’s the best, the next option is VS code. For big projects Anaconda..and learning purpose Jupiter notebook.

IDE:

An integrated development environment is the most powerful and very useful tool. It’s more than 50 plus applications are available in the market.

Ex: pycharm, vs code like etc..

IDE futures:

1. Syntax highlighting

The IDE editor usually provides syntax highlighting, it can show both the structures, the language keywords, and the syntax errors with visually distinct colors and font effects

2. Code completion

Code completion is an important IDE feature, intended to speed up programming. Modern IDEs even have intelligent code completion.

3. Refactoring

Advanced IDEs provide support for automated refactoring

4. Version control

An IDE is expected to provide integrated version control, in order to interact with source repositories

5. Debugging

IDEs are also used for debugging, using an integrated debugger, with support for setting breakpoints in the editor, a visual rendering of steps, etc

6. Code search

IDEs may provide advanced support for code search: in order to find class and function declarations, usages, variable and field read/write, etc. IDEs can use different kinds of the user interface for code search, for example, form-based widgets[5] and natural-language based interfaces

7. Visual programming

Visual programming is  Visual Basic allows users to create new applications by moving programming, building blocks, or code nodes to create flowcharts or structure diagrams that are then compiled or interpreted. These flowcharts often are based on the Unified Modelling Language.

8. Multi-Language support

Some IDEs support multiple languages, such as GNU Emacs based on C and Emacs Lisp, and IntelliJ IDEA, Eclipse, MyEclipse, or NetBeans, all based on Java, or MonoDevelop, based on C#, or PlayCode.

Support for alternative languages is often provided by plugins, allowing them to be installed on the same IDE at the same time. For example, Flycheck is a modern on-the-fly syntax checking extension for GNU Emacs 24 with support for 39 languages.[7] Eclipse and Netbeans have plugins for C/C++, Ada, GNAT (for example AdaGIDE), Perl, Python, Ruby, and PHP, which are selected automatically based on file extension, environment, or project settings.

 

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