Computer Science
Class -XI
Code No. 083
2023-24




CLASS-XI
SUBJECT: COMPUTER SCIENCE (083) – PYTHON
INDEX
NO. CHAPTER NAME 
1 INTRODUCTION TO PYTHON 
2 PYTHON FUNDAMENTALS 
3 DATA HANDLING 





CHAPTER-3
DATA HANDLING
 integer : There are two types of integers in python:
 int
 Boolean
 int: int or integer, is a whole number, positive or 
negative, without decimals.
Example:
x = 1
y = 35656222554887
z = -3255522
 Boolean: It has two values: True and False. True has 
the value 1 and False has the
value 0.
Example:
>>>bool(0)
False
>>>bool(1)
True
>>>bool(‘ ‘)
False
>>>bool(-34)
True
>>>bool(34)
True
 float : float or "floating point number" is a number, 
positive or negative, containing one
or more decimals. Float can also be scientific numbers 
with an "e" to indicate the power
of 10.
Example:
x = 1.10
y = 1.0
z = -35.59
a = 35e3
b = 12E4
c = -87.7e100

 complex : Complex numbers are written with a "j" as 
the imaginary part.
Example:
>>>x = 3+5j
>>>y = 2+4j
>>>z=x+y
>>>print(z)
5+9j
>>>z.real
5.0
>>>z.imag
9.0
Real and imaginary part of a number can be accessed 
through the attributes real and imag.
b. String: Sequence of characters represented in the quotation marks.
 Python allows for either pairs of single or double quotes.
Example: 'hello' is the same
as "hello" .
 Python does not have a character data type, a single 
character is simply a string with a
length of 1.
 The python string store Unicode characters.
 Each character in a string has its own index.
 String is immutable data type means it can never 
change its value in place.
2. Collection Data Type:
 List
 Tuple
 Set
 Dictionary

3.2 MUTABLE & IMMUTABLE Data Type:
 Mutable Data Type:
These are changeable. In the same memory address, 
new value can be stored.
Example: List, Set, Dictionary
 Immutable Data Type:
These are unchangeable. In the same memory address new 
value cannot be stored.
Example: integer, float, Boolean, string and tuple.
3.3 Basic Operators in Python:
i. Arithmetic Operators
ii. Relational Operator
iii. Logical Operators
iv. Bitwise operators
v. Assignment Operators
vi. Other Special Operators
o Identity Operators
o Membership operators
i. Arithmetic Operators: To perform mathematical operations.
OPERATOR NAME SYNTAX RESULT
(X=14, Y=4)
+ Addition x + y 18
_ Subtraction x – y 10
* Multiplication x * y 56
/ Division (float) x / y 3.5
// Division (floor) x // y 3
% Modulus x % y 2
** Exponent x**y 38416
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Example:
>>>x= -5
>>>x**2
>>> -25
ii. Relational Operators: Relational operators compare 
the values. It either
returns True or False according to the condition.
OPERATOR NAME SYNTAX RESULT
(IF X=16, Y=42)
> Greater than x > y False
< Less than x < y True
== Equal to x == y False
!= Not equal to x != y True
>= Greater than or equal to x >= y False
<= Less than or equal to x <= y True
iii. Logical operators: Logical operators perform Logical AND, 
Logical OR and Logical
NOT operations.
Examples of Logical Operator:
The and operator: The and operator works in two ways:
a. Relational expressions as operands
b. numbers or strings or lists as operands
OPERATOR DESCRIPTION SYNTAX
and Logical AND: True if both the operands are true x and y
or Logical OR: True if either of the operands is true x or y
not Logical NOT: True if operand is false not x
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a. Relational expressions as operands:
X Y X and Y
False False False
False True False
True False False
True True True
>>> 5>8 and 7>3
False
>>> (4==4) and (7==7)
True
b. numbers or strings or lists as operands:
In an expression X and Y, if first operand has false value, 
then return first operand X as a
result, otherwise returns Y.
>>>0 and 0
0
>>>0 and 6
0
>>>‘a’ and ‘n’
’n’
>>>6>9 and ‘c’+9>5 # and operator will test the second 
operand only if the first operand
False # is true, otherwise ignores it, even if the 
second operand is wrong
The or operator: The or operator works in two ways:
a. Relational expressions as operands
b. numbers or strings or lists as operands
a. Relational expressions as operands:
X Y X or Y
False False False
False True True
True False True
True True True
>>> 5>8 or 7>3
True
>>> (4==4) or (7==7)
True
X Y X and Y
false false X
false true X
true false Y
true true Y
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b. numbers or strings or lists as operands:
In an expression X or Y, if first operand has true 
value, then return first operand X as a
result, otherwise returns Y.
X Y X or Y
false false Y
false true Y
true false X
true true X
>>>0 or 0
0
>>>0 or 6
6
>>>‘a’ or ‘n’
’a’
>>>6<9 or ‘c’+9>5 # or operator will test the second 
operand only if the first operand
True # is false, otherwise ignores it, even if the 
second operand is wrong
The not operator:
>>>not 6
False
>>>not 0
True
>>>not -7
False
Chained Comparison Operators:
>>> 4<5>3 is equivalent to >>> 4<5 and 5>3
True True
iv. Bitwise operators: Bitwise operators acts on bits 
and performs bit by bit operation.
OPERATOR DESCRIPTION SYNTAX
& Bitwise AND x & y
| Bitwise OR x | y
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~ Bitwise NOT ~x
^ Bitwise XOR x ^ y
>> Bitwise right shift x>>
<< Bitwise left shift x<<
Examples:
Let
a = 10
b = 4
print(a & b)
print(a | b)
print(~a)
print(a ^ b)
print(a >> 2)
print(a << 2)
v. Assignment operators: Assignment operators are 
used to assign values to the variables.
OPERA
TOR DESCRIPTION SYNTAX
= Assign value of right side of expression to left 
side operand x = y + z
+= Add AND: Add right side operand with left side
operand and
then assign to left operand
a+=b
a=a+b
-= Subtract AND: Subtract right operand from left 
operand and then
assign to left operand
a-=b a=a-
b
*= Multiply AND: Multiply right operand with left
operand and then
assign to left operand
a*=b
a=a*b
Output:
0
14
-11
14
2
40
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/= Divide AND: Divide left operand with right operand 
and then
assign to left operand
a/=b
a=a/b
%= Modulus AND: Takes modulus using left and right 
operands and
assign result to left operand
a%=b
a=a%b
//= Divide(floor) AND: Divide left operand with right 
operand and
then assign the value(floor) to left operand
a//=b
a=a//b
**= Exponent AND: Calculate exponent(raise power) 
value using
operands and assign value to left operand
a**=b
a=a**b
&= Performs Bitwise AND on operands and assign value 
to left
operand
a&=b
a=a&b
|= Performs Bitwise OR on operands and assign value
to left
operand
a|=b
a=a|b
^= Performs Bitwise xOR on operands and assign value 
to left
operand
a^=b
a=a^b
>>= Performs Bitwise right shift on operands and assign 
value to left
operand
a>>=b
a=a>>b
<<= Performs Bitwise left shift on operands and assign 
value to left
operand
a <<=b a=
a << b
vi. Other Special operators: There are some special type 
of operators like-
a. Identity operators- is and is not are the identity 
operators both are used to check if
two values are located on the same part of the memory. 
Two variables that are equal
does not imply that they are identical.
is True if the operands are identical
is not True if the operands are not identical
Example:
Let
a1 = 3
b1 = 3
a2 = 'PythonProgramming'
b2 = 'PythonProgramming'
a3 = [1,2,3]
b3 = [1,2,3]
print(a1 is not b1)
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Output:
True
True
False
True
False
3.4 Operator Precedence and Associativity:
Operator Precedence: It describes the order in which 
operations are performed when an
expression is evaluated. Operators with higher precedence 
perform the operation first.
Operator Associativity: whenever two or more operators 
have the same precedence, then
associativity defines the order of operations.
Operator Description Associativity Precedence
( ), { } Parentheses (grouping) Left to Right
f(args…) Function call Left to Right
x[index:index] Slicing Left to Right
x[index] Subscription Left to Right
** Exponent Right to Left
~x Bitwise not Left to Right
+x, -x Positive, negative Left to Right
*, /, % Product, division, remainder Left to Right
+, – Addition, subtraction Left to Right
<<, >> Shifts left/right Left to Right
& Bitwise AND Left to Right
^ Bitwise XOR Left to Right
| Bitwise OR Left to Right
<=, <, >, >= Comparisons Left to Right
=, %=, /=, += Assignment
is, is not Identity
in, not in Membership
not Boolean NOT Left to Right
and Boolean AND Left to Right
or Boolean OR Left to Right
lambda Lambda expression Left to Right
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