The document discusses Python data types and variables. It notes that integers, floating points, booleans, strings, and tuples are immutable, while lists and dictionaries are mutable. Variables represent labeled storage locations that can be manipulated during a program run. Python allows dynamic typing where the type is set during execution rather than declaration. Mutable variables can change value in-place while immutable variables reference value objects and the reference changes when the value changes. The document also covers functions, expressions, function calls, blocks, comments, statements, indentation, input/output, and type casting.

1. Data Types
● Integers (int) Immutable
● Floating Points (float) Immutable
● Booleans (bool) Immutable
● Strings (str) Immutable
● Lists Mutable
● Tuples ( constant list ) Immutable
● Dictionaries Mutable

2. Variables & Assignments
Variable represent labelled storage locations, whose values can be
manipulated during program run.
Roll_no = 41
Name = ‘Harsh’
**Python allows dynamic typing.

3. Mutable & Immutable Variables
Mutable Variables can change their value in place.
Immutable Variables never changes their values, they reference to a
value-object. When we change value the reference address changes.

4. Some Terms
def India( ):
. print(“Atma Nirbhar. ”)
#Boycott_China
a=5
b=a+3
print(b+a)
India( )
Comment
Statement
Indentation
Function
Expression
Function call
Block
Variable

5. Age = input( ‘Enter your age : ’) default input datatype is str.
print(Age)
print(‘My age is : ’ ,Age)
print(‘My’, ’name’, ’is’, ’Harsh’) My name is Harsh
print(‘My’, ’name’, ’is’, ’Harsh’ , sep=’!’) My!name!is!Harsh
Default separator is ‘space’
print(‘My’, ‘name’, ‘is’, ‘Harsh’ ,end=’-’) My name is Harsh-
Default end is ‘endline’
Input & Output

6. Type Casting (Very Important)
Conversion of one data type into another.
There are two types :
01. Implicit Type Casting :
A = 5.0
B = 4
C = A+B
02. Explicit Type Casting :
A = 5.0
B = int(A)