Lecture 4: Variables: Types, Naming Rules | Python for Beginners | Python full course in Hindi смотреть онлайн

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Python Variables
Variable is a name that is used to refer to memory location. Python variable is also known as an identifier and used to hold value.
In Python, we don't need to specify the type of variable because Python is a infer language and smart enough to get variable type.

Identifier Naming
Variables are the example of identifiers. An Identifier is used to identify the literals used in the program. The rules to name an identifier are given below.

1) The first character of the variable must be an alphabet or underscore ( _ ).
2) All the characters except the first character may be an alphabet of lower-case(a-z), upper-case (A-Z), underscore, or digit (0-9).
3) Identifier name must not contain any white-space, or special character (!, @, #, %, ^, &, *).
4) Identifier name must not be similar to any keyword defined in the language.
5) Identifier names are case sensitive; for example, my name, and MyName is not the same.

Declaring Variable and Assigning Values
Python does not bind us to declare a variable before using it in the application. It allows us to create a variable at the required time.
We don't need to declare explicitly variable in Python. When we assign any value to the variable, that variable is declared automatically.
The equal (=) operator is used to assign value to a variable.

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The multi-word keywords can be created by the following method.

1) Camel Case - In the camel case, each word or abbreviation in the middle of begins with a capital letter. There is no intervention of whitespace.
For example - nameOfStudent, valueOfVaraible, etc.
2) Pascal Case - It is the same as the Camel Case, but here the first word is also capital. For example - NameOfStudent, etc.
3) Snake Case - In the snake case, Words are separated by the underscore. For example - name_of_student, etc.

Multiple Assignment
Python allows us to assign a value to multiple variables in a single statement, which is also known as multiple assignments.
We can apply multiple assignments in two ways, either by assigning a single value to multiple variables or assigning multiple values to multiple variables.
Consider the following example.

1) Assigning single value to multiple variables.
2) Assigning multiple values to multiple variables.

Python Variable Types
There are two types of variables in Python:

1) Local Variable
2) Global Variable

Delete a variable
We can delete the variable using the del keyword. Syntax del variable_name

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