PYTHON INTRODUCTION

What is python?

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What is python?

Python is a popular programming language.

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Tells us an actual fact of python?

• The most recent major version of Python is Python 3, which we shall be using in this tutorial. However, Python 2, although not being updated with anything other than security updates, is still quite popular.

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What can Python do?

• Python can be used on a server to create web applications.
• Python can be used alongside software to create workflows.
• Python can connect to database systems. It can also read and modify files.

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We can use python for....

• web development (server-side),
• software development,
• mathematics,
• system scripting.

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Compared to other programming languages...

• Python was designed for readability, and has some similarities to the English language with influence from mathematics.

Installation

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Python is normally...

already installed on many PCs and Macs.

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The way to run a python file is like this on the command line:

C:\Users\Your Name>python helloworld.py

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To check if you have python installed on a Windows PC...

Search in the start bar for Python or run the following on the Command Line (cmd.exe):

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To check if you have python installed on a Linux or Mac...

Then on linux open the command line or on Mac open the Terminal and type: python --version

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If you find that you do not have Python installed on your computer...

Then you can download it for free from the following website: https://www.python.org/

Syntax

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Python syntax can be executed by writing directly in the Command Line:

>>> print("Hello, World!")
Hello, World!

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Or by creating a python file on the server, using the .py file extension, and running it in the Command Line:

C:\Users\Your Name>python myfile.py

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What is Python Identation?

Indentation refers to the spaces at the beginning of a code line.

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What does python use identation for?

Python uses indentation to indicate a block of code.

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Use the same number of spaces in the same block of code, otherwise

Python will give you an error

Comments

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What can Python Comments be used for?

Comments can be used to explain Python code.

Comments can be used to make the code more readable.

Comments can be used to prevent execution when testing code.

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All comments start with a...

Comments starts with a #.

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What will Python do to comments?

Python will ignore them.

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Comments can also be placed...

at the end of the line. (Python will still ignore them).

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Besides a comment not having to explain the code, it can also...

be used to prevent Python from executing code: 

#print("Hello, World!")
print("Cheers, Mate!")

Variables

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How can you create a variable?

A variable is created the moment you first assign a value to it.

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What are variables?

Variables are containers for storing data values.  

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What can be done with casting?

If you want to specify the data type of a variable, this can be done with casting.

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What can you do with the type() function?

You can get the data type of a variable with the type() function.

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What can single or double quotes do?

String variables can be declared either by using single or double quotes: