Description
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:
- Numeric
- String
- List
- Tuple
- Dictionary
- 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 :
and | del | from | None |
True | as | elif | global |
nonlocal | try | assert | else |
if | not | while | break |
except | import | or | with |
class | false | in | pass |
yeild | continue | finally | is |
raise | def | for | lambda |
return |
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