July 10, 2024 Python | DataTypes, Variables, Constants

This is a series of Python learning blog from parottosalna community by kaniyam foundation

This blog is based on this video Python | DataTypes, Variables, Constants | ParottaSalna"

To watch the full series check this youtube playlist

Contents

1. Datatypes
2. Variables
3. Constants
4. General Notes

Datatypes:

• 3 Types of Datatypes

  1. Numeric
     1. Integer
     2. Float / Decimal number
     3. Constants
  2. Text
  3. Boolean Types
     • True, False, None
     • Examples:
       • is_active = true
       • no_of_apples = none

• Command to check the input type type(26) , Output will be int datatype

• Everything in Python Language is "Object"

• Command to see functionalities of a Object dir(26) , Output show the available functionalities as a list.

• str is the short form of String.

• Addition of Strings

  • "Vishal" + "J" , The Output will be VishalJ

Variables:

• Variable is a container to hold the values. And Variables will refer to Object / Value / Data.

• There are some regulations in variable writing

  1. No symbol in-between
  2. Only start with Characters.

• Command for Multiple assignment

  • name, age = "Vishal", 20
    • Here is a example of tuple data type

• Command to print the datatype in a program

  • print(type(name))

• Running inspect - terminal option in browser to use JavaScript program

• Commenting is useful to denote what is going in a program

  • To comment single line #
  • To comment multiple lines """Hello world """

Constants:

• Types of Constants styles

  1. PascalCase
  2. Camelcase
  3. snake_case

• Google Colab uses Jupiter notebook and into include automatic feature to print texts without print function

• Book recommendation

  • Byte of Python

• Quiz's and Tasks for Practising

• File handling commands

  • Command to create a new file "file.txt" in F folder with program of print("Some content")
    • with open("file.txt", "w") as f: print("some content", file=f)

• Concatenate make to add two strings as metioned in above before

  • print("Hello" + " World" , the Output will be Hello World
  • print("Hello" , "World") , The Output will be Hello World . Here the the , symbol will add some space between the words.

General Notes

• By using Books you can use to self study and to advance

• Note: We can paste images in Zoom chat option

• To learn JavaScript one must have to know HTML

• Forums to ask questions

  1. Stack overflow
  2. Chennai mailing list
  3. Tamil Linux Community