Numbers

• Number data types are used to store the numerical values
• Different numerical types in Python

               Integer numbers: Positive or Negative  whole numbes(EX: 1,10,-18)

               Floating point numbers: Real number with decimal points(EX: 10.9, 23.008)

               Complex numbers: Numbers are in the from of X+Yi , where i is the imaginary number

Python Data Types

Python provides some built-in data types as listed below

• Numbers: Numerical values
• String: Sequence of Unicode characters
• Boolean: “Truthiness” || True or False
• List: Ordered sequence of items
• Tuple: Same as List, but they are immutable
• Dictionary: Unordered collection of key-value pairs
• Set: Unordered collection of unique items

Variable Assignment Statements and Naming Rules & Conventions

What is a Variable?

• Variables are used to store information to be referenced and manipulated in a computer program
• We use "=" symbol to assign a value to a variable

            var1 = value

Variable Name Rules

• The variable name must start with [a-z][A-Z]or _(underscore) followed with any number of characters from [a-z][A-Z][0-9] or _(underscore)
• Variable names are case sensitive("SACHIN" is not same as "sachin")
• There are some python keywords reserved for a special purpose . We should avoid using those keywords as a variable name.(keyword-list)

Dynamic type binding

• Unlike other strongly-typed programming languages like C,C++ JAVA etc where  we have to define variable along with data type they are going to hold, is not required in Python