Variable | Datatypes | Keywords | Python Programming Language

Variable is used for store the data in python programming language. The value of variable can be changed, and variable reused many times.

Syntax of Create Variable in Python Programming

Python has no command for declaring a variable.

var1 = 5;
name = "JOHN"
print(var1)
print(name)

Output:

5
JOHN

In Python Programming language, variables do not need to be declared with any particular type.

Type casting in Python Programming

The type casting is one data types to another data types.

x = str(5)    # x will be '5' as a string
y = int(5)    # y will be 5 as a integer
z = float(5)  # z will be 5.0 as a float

How to get the type of variable

You can get the data type of any variable using the type() function.

x = 8
y = "lapmos"
print(type(x))
print(type(y))

Output:

<class 'int'>
<class 'str'>

Single or Double Quotes in string

String is declared either by using single quotes or double quotes.

x = "JAMES"   # x is a string and valid
x = 'JAMES'   # valid
# both are same

Case Sensitive in Python programming

In Python programming language, Variables names are case-sensitive.

x = 5
X = "JAMES"
# x and X are the different variable 

Rules of Declaration Variable in Python Programming

• A variable starts with the alphabets or underscore in python.
• A variable can not start with number and any digits in python.
• No white space allowed to declare the variable in python programming.
• No Special Characters Allowed except underscore.
• Variable are case-sensitive.

#Valid / Legal variable names
var = "lapmos"
var1 = "lapmos"
var_ = "lapmos"
_var = "lapmos"
VAR = "lapmos"

Multiple Variables in one line.

Python allows you to assign values to multiple variables in one line:

a, b, c = "JOHN", "JAMES", "NICK"
print(a)
print(b)
print(c)

Output:

JOHN
JAMES
NICK

One Value to Multiple Variable at the one line.

a = b = c = "JOHN"
print(a)
print(b)
print(c)

Output:

JOHN
JOHN
JOHN

Datatypes in Python Programming

The Data types specifies the type of data that the variable can store the value.

Python has six basic data types which are as follows:

1. Numeric 
2. String
3. List
4. Tuple
5. Dictionary
6. Boolean

Keywords Python Programming language

Keywords is reserved word in Python Programming language. Keywords can not use as a variable. Keyword in Python Programming language :