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Environment Setup And Sample Application Using Python

Introduction 

 
In this lesson, we will briefly discuss about the below points with an example.
  1. What is Python?
  2. Python features
  3. Environment setup
  4. My first application using Python
  5. Python keywords
So, let’s start with point number #1.
 
What is Python?
Python is an Object Oriented, interactive, interrupted and high-level programming language.
 
It’s like Perl, the Python source code available under the GNU General Public License.          
 
Overview
 
It is designed to be highly readable and let’s discuss about the syntactical constructions compared with other languages.
  • Object Oriented - Python supports Object Oriented Programming that encapsulates code within objects
  • Interpreted - Python is executed at runtime interpreter. We must compile the program before executing the application. It’s same as PERL and PHP.
  • Interactive - Python prompt can communicate with interpreter with your application or program. 
Python futures
 
We have lot of futures in Python programming. It has keywords, structures and defined syntax in Python code.
 
The futures are,
  1. Easy to 1earn
  2. Easy to read
  3. Broad Standard Library
  4. East to Maintain
  5. Portable
  6. Extendable
  7. Broad Standard Library
  8. GUI Programming
  9. Scalable
Environment Setup
 
Here, we will discuss a step by step process to configure Python environment setup.
 
Step 1
  • Go to https://www.python.org site to install the software.
  • Click on Download menu and select the “Python 3.6.5” version. You can see that in the below screenshot.
     
    Python
Step 2
 
Click on the “Download Python 3.6.5” button. Then it will generate the .exe (executable) file on the browser window.
 
Python
 
Step 3
  • Click the .exe file. You will get into the Python installation page
  • So, you can directly hit the “Install Now” or if you want to customize the changes go with “Customization installation”
  • Here, I selected “Install Now” option - find the point #1
  • Screen #2 - Setup is processing.
     
    Python
  • Screen #3 - The Setup has been completed
  • Screen #4 - You can see the Python command line and module documents on “Start - All Programs”.
     
    Python
My first application using Python
 
Go to Start - All Programs - Click on “Python 3.6”. You will see the comment prompt on the window.
 
Here, we are going to display the plain text on command prompt
 
Syntax
 
Print - It is a keyword used to display the text on window/prompt
 
And you enter the text in between open (“and close “)”
 
Example
 
Print (“Hello World”)
 
Enter the text on command prompt and hit enter. You can see result on the prompt.
 
Find the screenshot.
 
Python
 
This is another way to execute the command lines on prompt. This windows looks like “White background”.
 
Python
 
Error Message
 
Python
 
If you have not followed the syntax, you will get an error message on command prompt.
 
Find the above screenshot, we have forgotten to enter the open (and closing ) brace.
 
Make sure you are following the syntax.
 
Python Keywords
 
Keywords
and exec not
assert finally or
break for pass
class from print
continue global raise
def if return
del import try
elif in while
else is with
except lambda yield
These are all the keywords we are using in the Python language.
 
I will briefly discuss about the Variables, Basic Operators, Conditions and Loops in my next session.
 
Please let me know  if you any queries.


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