CH 3 - DATA HANDLING (Module 4)

Question 1

python built in core data types

Answer 1

1. numbers
2. strin
3. list
4. tuple
5. dictionary

Question 2

numbers (types)

Answer 2

1. integers
   i. integers (signed)
   ii. booleans
2. floating point numbers
3. complex numbers

Question 3

bool(0)

Answer 3

false

Question 4

bool(1)

Answer 4

true

Question 5

floatin point numbers advantages over inteers

Answer 5

1. they can represent values between inteer

2 wider range of numbers it can represent

Question 6

disadvantae of floatin point number

Answer 6

they are slower than inteer operations

Question 7

python respresents complex numbers in what form

Answer 7

A + Bj
a = 0 + 3.1j
b = 1.5 + 2j

Question 8

why is j symbol used to represent complex number i

Question 9

z = 2.5 + 3.9j

print(z.real) and print(z.imag)

Answer 9

2.5 and 3.9

Question 10

python index or subscript

Answer 10

the numbered position of a letter in the string

• a python string is a sequence of characters and each character can be accessed using its index
• strings in python are stored as INDIVIDUAL CHARACTERS in contiguous location with TWO WAY INDEX for EACH LOCATION

Question 11

python indices length

Answer 11

python indices begin 0 onwards in forward direction and -1, -2 in backward direction
- the length of python index of any string from forward would be lenth-1 since index starts from 0

Question 12

are strings immutable or mutable

Answer 12

IMMUTABLE

Question 13

how are strings immutable

Answer 13

• you cannot change the individual letters of a string in place by assignment because STRINS ARE IMMUTABLE
• hence, ITEM ASSINMENT IS NOT SUPPORTED
  for ex:
  name = “hello”
  name[0] = “p”
  error aayega

Question 14

lists [1, 2, 3]

Answer 14

lists in python represent a list of comma separated values of any datatype between square brackets

Question 15

are lists immutable or mutable

Answer 15

mutable

Question 16

a = [1, 2, 3] chane 1 to 10 in th elist

Answer 16

a [0] = 10
print(a)
a = [10, 2, 3]

Question 17

tuples ( )

Answer 17

represented as a roup of comma separated values of any data type with paranthesis/ brackets

Question 18

are lists immutable or mutable

Answer 18

immutable

Question 19

sets

Answer 19

similar to lists that can store multiple values same as mathematical sets

Question 20

differences bw sets and lists

Answer 20

sets lists
{ } [ ]
unordered and unindexed
doesnt allow duplicate entries
cannot contain mutable elements
SIMILARITY: BOTH ARE MUTABLE THO

Question 21

what deos it mean that sets cannot CONTAIN mutable elements

Answer 21

a list cannot exist inside a set
ex: { 1, 2, [3, 4] } = 3,4 is a list which is written inside set

however, a tuple CAN BE CONTAINED inside a set since a tuple is immutable
ex: { 1, 2, (3, 4)

Question 22

are sets immutable or mutable

Answer 22

MUTABLE

even thouh it cannot contain mutable elements, it is MUTABLE

Question 23

dictionary

Answer 23

it is an unordered set of comma sepaqrated key: value pairs within { }

• no keys can be the same in a dictionary
• THERE ARE UNIQUE KEYS IWTHIN A DICTIONARY

Question 24

everything is a ______ in python

Answer 24

object: it is an entity that has certain properties and that exhibit a certain type of behaviour
- python calls every entity that stores any values or any type of data as an object
- cuz python is an object oriented language
- strins, tuples, lists, dictionaries (all data types), inteers, numbers, variables are all objects

Question 25

id function?

Answer 25

the id function when you use on any data value or variable, it returns the unique identity of the object, which is its assigned memory address

Question 26

mutability means

Answer 26

it means that in same memory address, new value can be stored as in when you want. -the types that do not support this property are immutable type data objects

Question 27

exs of immutable type data objects

Answer 27

``` inteers floatin point nos booleans strins tuples ```

Question 28

mutable type data objects in python are

Answer 28

list dictionaires sets

Question 29

unicode code or lexicoraphical code

Answer 29

the ordinal values of the characters ordinal code of small alphabets is reater than those of capital alphabets a > A 97 > 65

Question 30

EQUALITY AND IDNTITY (is) IMPORTANT REATION

Answer 30

``` 1. If a IS b = TRUE then, a == b However, 2. If a ==b a IS b need not be true ```