Learn Python Programming Language| Python Tutorial
Welcome learner! Hope you are doing good. This Python Programming Language tutorial is designed for folks who need to learn the Python programming language from scratch and is most beneficial for one who just wants to refresh their Python programming language knowledge.
Let’s get started!
The most recent major version of Python is Python 3, which we shall be using in this tutorial. Python was created by Guido van Rossum and was launched on 20 February 1991 (development period 1985 – 1990). More Historical Details
What is Python?
Python is an object-oriented, high-level, interpreted, general-purpose programming language. Python is a free and open-source language that is available under the GNU General Public License (GPL). Python has a very simple and clean syntax thus making it a lot easier for a developer to learn this language.
Since python is a general-purpose language, it can be used to build almost any type of application with the right tools/libraries. In Addition, python supports objects, modules, threads, exception-handling, and automatic memory management which help in modeling real-world problems and building applications to solve these problems.
What do Python use for?
Python is one of the most widely-used and loved programming languages and is interpreted in nature thereby providing flexibility of incorporating dynamic semantics.
Python is used for Software development, Web development (server-side), Web Scraping, Task Automation, Data Analysis, Data visualization. Python is also used in Machine Learning, Artificial Intelligence, system scripting, and various other domains due to its ability to support powerful computations using powerful libraries.
- Python syntax prompts developers to write programs with fewer lines.
- Python has a simple syntax similar to the English language.
- Since the python language is an Interpreter (similar to PERL and PHP), the python code can be executed as soon as it is written. Which enables super quick prototyping.
- Python supports procedural, object-oriented or a functional style or technique of programming.
- Python syntax is similar to the English language and hence a great language for the beginner-level programmers.
- It supports automatic garbage collection.
Python when compared to other languages?
- An Command is completed in python through a new line, whereas in other languages a semicolon or parentheses are used to complete a command.
- Python highly depends on indentation which is achieved using whitespace. The indentations are very important to define scope; such as the scope of loops, functions and classes. Other programming languages often use curly-brackets for this purpose.
- Other programming languages use the indentation in code for readability only, the indentation in Python indicates a block of code.
Comments in Python?
A hash sign (#) is used for single-line comments. The Python interpreter ignores anything which starts with #. Anything and everything after # is treated as a comment until the newline.
#!/usr/local/bin/python3 # Use Comments to prevent execution when testing code. #print("Im Testing the python logic.") #Use Comments to explain Python code and make it more readable. #Print "Hello World" to Console/Terminal. print("Hello, World!")
One can use # for each line to comment multi-line or one can use multiline string.
The multiline string is not really a comment but we can use it to create a multiline comment because python ignores string literals that are not assigned to a variable. So you can place comments inside a multiline string (triple quotes) in your code.
""" This is a multiline comment use Below command to run this file python3 ./test.py """ print("Hello, World!")
Python Reserved Words or Python keyword?
Python does not allow to use of its reserved words for constant or variable or any other identifiers names. Remember all the Python keywords contain lowercase letters only.
Any name that resembles a variable, function, class, module, or other object and that starts with A to Z or a to z or an underscore (_) followed by zero or more letters, underscores, and digits (0 to 9) is called A Python identifier.
Note: punctuation characters such as @, $, and % are not allowed within identifiers. Also, Python is a case-sensitive programming language. Thus, Variable and variable are two different identifiers in Python.
Quick Knowledge Bucket:
Variable: Variables are containers for storing data values.
Function: A block of code that runs as and when it is called. One can pass data i.e parameters into the function. A function can also return the result as data.
Class: is a way for creating objects, i.e an object constructor.
Module: a file counting python logic and commands. Which can be structured as a function, classes, or direct executable code.
Python is a very simple programming language to learn. But to keep the learning process smooth you should have a basic understanding of Computer Programming terminologies. A basic understanding of any of the programming languages is a plus (if you have some knowledge of C or C++ programming language then learning python programming language will be a piece of cake for you).