Introduction

Question 1

Data Types

1. How many data types are there in python

Answer 1

There are 8 data types, they are:

1. Integer - int
2. Floating Point - float
3. String - str
4. Lists - list
5. Dictionary - dict
6. Tuples - tup
7. Sets - set
8. Booleans - bool

Question 2

Data Types

2. Integer

Answer 2

Whole Numbers, positive or negative

Example:
- 2 444 66

Question 3

Data Types

3. Floating Point

Answer 3

Decimal numbers eg. 2.3 33.0 0.009

Apart from using decimal point they also sometimes use Exponential (E)
\ (e) to define the number.

For example: 4E2 (4 times 10 to the power of 2)

Question 4

Data Types

4. String

Answer 4

Ordered sequence of Characters- ‘‘hello’’ ‘999’ “34ndj”

Question 5

Data Types

5. Lists

Answer 5

Ordered sequence of Objects - [“apple”, 10, 1.24]

Question 6

Data Types

6. Dictionaries

Answer 6

Unordered Key, value pairs - {“mykey”: “value”, “name”: “franky”}

Question 7

Data Types

7. Tuples

Answer 7

Ordered immutable sequence of objects -
( 10, “hello”, 200.3)

Question 8

Data Types

8. Sets

Answer 8

Unordered collection of unique objects - {“a”, “b”}

Question 9

Data Types

9. Booleans

Answer 9

Logical Value indicating - True or False

Question 10

Data Types

10. What do you mean by data types?

Answer 10

Data type is a classification that specifies which type of value a variable has.

Question 11

Data type

11. What is a variable in python?

Answer 11

i. A python variable is a symbolic name that is a reference or pointer to an object.

ii. Once an object is assigned to a variable, one can refer to the object by that name.

iii. But the data itself is still contained within the object. For example

n = 300

Question 12

Data type

Numbers

12. What are the Arithmetic Operators?

Answer 12

Addition +

Subtraction. -

Multiplication *

Division /

Floor Division. //

( eg. 7 // 4 = 1 . The // operator (two forward slashes) truncates the decimal without rounding, and returns an integer result)

.Power **

Mod %

Question 13

Data type

13. ________ Brings back reminder after division

Answer 13

Modulo or Mod operator

Question 14

Data type

14. This is used to check whether a number is even or odd, for instance to find 23%2 is even or odd? If the result is 0 its not even. Which arithmetic operator is used?

Answer 14

Modulo or Mod

Question 15

Data type

15. What is the difference between floating point and an integer?

Answer 15

Integer - Whole Number
Floating point - Decimal Number

Question 16

Variable Assignments

Variable Assignments

16. What are the rules followed in naming variables?

Answer 16

i. Names can’t start with number

ii. No spaces in the name, _ can be used instead

iii. Can’t use symbols like - : “” ‘’ , <> | \ ? / () ! @ # $ % ^ & * ~ - +

iv. Use lowercase (according to PEP8)

v. Avoid Special Meaning words like “list”, “str”, ect.,

vi. Avoid using ( L ) , ( O ) , ( I ) because they can mistook as 1 and 0

Question 17

Data type

17. Python uses _____ typing

Answer 17

Dynamic

Question 18

Data type

18. What is Dynamic Typing? and What are the pros and cons of dynamic typing?

Answer 18

Dynamic typing enables to reassign variables to different data types.

• Pros of Dynamic Typing
  1. very easy to work with
  2. faster development time
• Cons of Dynamic Typing
  1. may result in unexpected bugs!
  2. you need to be aware of type()

Question 19

String

Assigning and Reassigning

i. For the variable assignment ___ assignment operator is used. an example ___

ii. What command should be applied, to find a Type of a variable?

Answer 19

i. = , name = object

ii. type( variable name )

Question 20

String

20. What is a String?

Answer 20

Strings - Ordered Sequences of Characters, which means Indexing and Slicing can be done to grab sub-sections of the string
- Using Syntax of ‘ ‘or “ “
- Example: ‘hello’, “hello”, “I don’t do that”

Question 21

String

21. What are the features Indexing ?

Answer 21

• Uses [ ] notation after the string
• Grabs single character from the string
• Every single character is assigned with a number
  For Instance:

Character : H E L L O
Index : 0 1 2 3 4
Reverse Index : 0 -4 -3 -2 -1

Question 22

String

22. What is Slicing?

Answer 22

Slicing - Grabs a subsection of multiple characters
i.e. A “Slice of a string”

• [Start:Stop:Step]

Question 23

23. Define Start , Stop , Step?

Answer 23

Start - Numerical index for the slice Start

Stop - The index u will go uptown but not include

Step - Size of the ‘Jump’ u take

Question 24

String

24. How to apply Print Function?

Answer 24

The commons has taken out the double quotes and given the output

print (“Hello World”)

Hello World

Question 25

# String 25. What if "Hello World" is typed in directly without using print( )?

Answer 25

IN : "Hello World" OUT : "Hello World" output comes as it was typed in

Question 26

# Strings 26. ESCAPE SEQUENCE

Answer 26

\n

Question 27

# String 27. How to run the Escape Sequence?

Answer 27

IN : print ( 'Hello\nWorld' ) OUT : Hello World

Question 28

# String 28. How to run TAB command ?

Answer 28

- \t IN : print ('Hello\tworld") Out: Hello World #gives 4 spaces between the words

Question 29

# String 29. LENGTH FUNCTION

Answer 29

- len - outputs length of the string - len( 'hello' ) - OUT: 5

Question 30

# String 30. In length function ______ is counted as a character.

Answer 30

Space

Question 31

# String String Indexing and Slicing 31. ________ grabs single characters from a string.

Answer 31

String Indexing

Question 32

# String 32. name. = "Sam" name[0] = 'P' Can't do this for a string because strings are _______.

Answer 32

Immutable

Question 33

# String 33. Merging two strings together are called __________.

Answer 33

Concatenation

Question 34

# String 34. Give an example for concatenation.

Answer 34

last_letters = 'am' 'P' + last_letters OUT : 'Pam'

Question 35

# String 35. How to run multiple concatenation?

Answer 35

letter = 'A' letter * 10 OUT : ' AAAAAAAAAA'

Question 36

# String 36. To get Methods and attributes on Jupiter notebook, _______ is to be clicked.

Answer 36

Tab

Question 37

# String 37. Are strings mutable?

Answer 37

Strings are not mutable (meaning it cannot use indexing to change individual elements of a string)

Question 38

# String 38. How to create comments in of a code?

Answer 38

Using #HASTAG

Question 39

# String Print Formatting and Strings 39. What is Interpolation? And what are the methods involved in Print Formatting?

Answer 39

Interpolation is mostly used to in put missing values in the data-frame or series while preprocessing data. There are three methods. - .format()method - f-strings (formatted strin literals) - % modulo CURRENTLY NOT USED: (The oldest method involves placeholders using the modulo % character. You can use %s to inject strings into your print statements. The modulo % is referred to as a "string formatting operator". eg.) print("I'm going to inject %s here." %'something')

Question 40

# String 40. What is the purpose of .format( )method and write the syntax?

Answer 40

To add formatted objects to printed string statements. 'String { }' .format ( 'something1', 'something2')

Question 41

# String 41. An example for .format( ) method.

Answer 41

print ( ' Hello World { } ' .format ( ' New Earth' ) )

Question 42

# String 42. Indexing in .format( ) method , example.

Answer 42

print ('The {2} {1} {0}' .format ('fox','brown','quick') )

Question 43

# String 43. Assigning Keywords for .format ( ) , example.

Answer 43

print ('The {q} {b} {f}' .format (f='fox',b='brown',q='quick') )

Question 44

# String 44. Syntax of f - strings.

Answer 44

Syntax : "{ value : width .precision f}"

Question 45

# String 45. Example : Float Formated / f-string

Answer 45

name = " Sam " age = 3 print ( f ' {name} is {age} years old' ) OUT : Sam is 3 years old

Question 46

Lists 46. Write a note on Lists?

Answer 46

1. Lists are Ordered sequences - can hold different object types 2. Brackets and Commans are used eg. [1,2,3,4,5] 3. Supports Indexing, Slicing and Concatenation 4. Can be nested and. also have a variety of useful methods that can be called off of them. 5. Can mutate, change or resign

Question 47

47. .append ( )

Answer 47

Allows to add a new element to the list.

Question 48

48. .pop ( )

Answer 48

Removing an last item from the list.

Question 49

49. Can an item be removed from a list at any index point?

Answer 49

Yes, by using indexing item = [ 'apple', 'orange', 'mangoes,] item.pop(2) ['apple','orange']

Question 50

# Lists , built in methods Write few elements that are used in list?

Answer 50

1. .append ( ) 2. .pop ( ) 3. .sort ( ) 4. .reverse ( )

Question 51

# String, built in method 51. Give an example : - .split ( ) (two methods) - .upper ( )

Answer 51

x = 'Hello World' x.split( ) OUT: ['Hello' , 'World'] x.split ( l ) OUT: ['He', '', 'o Wor', 'd'] (#coverts string into a list) x.upper ( ) OUT : 'HELLO WORLD'

Question 52

Dictionaries 52. Write a note on dictionaries?

Answer 52

1. Dic are Unordered mappings of storing objects - Key value mapping means that its going to insert key value pairs where ever it is most efficient 2. Dic use Key-Value pairing to store data objects 3. Without the need to know the index location, key-value pairs allows user 4. Dic use Curly Braces and Colons to signify the keys and their associated values eg. {'key1':'value1','key2':'value2'}

Question 53

53. When to choose dictionary over list?

Answer 53

When quickly needed to retrieve an item without knowing the index location.

Question 54

54. Objects retrieved by key name - Objects retrieved by location -

Answer 54

Dictionaries Lists

Question 55

55. ____ sequence can be Indexed or Sliced.

Answer 55

Ordered Sequence

Question 56

56. Syntax of Dictionary

Answer 56

{"mykey1" : "value", "mykey2" : "value"}

Question 57

57. Give an example for dictionary.

Answer 57

prices_lookup = {'apple': 2.99, 'oranges': 1.99, 'milk' : 5.80} prices_lookup ['apple'] OUT: 2.99

Question 58

58. Give an example to understand, how list is associated within dictionary and Indexing?

Answer 58

d = {'k1': 123, 'k2': [0, 1, 2, 3], 'k3':{'insidekey': 100}} d['k3']['insidekey'] OUT: 100 Indexing d['k2'] [1] OUT: 1

Question 59

59. Give example : Changing the letter C to uppercase in dictionary.

Answer 59

dd = {'key1': ['a','b','c']} dd Out: mylist = dd['key1'] mylist OUT: letter = mylist[2] letter OUT: letter.upper( ) OUT: 'C'

Question 60

60. Give example : Changing the letter C to uppercase in dictionary. In Single step.

Answer 60

dd ['key1'] [2] .upper( ) OUT: 'C'

Question 61

61. Adding a new key value pair to the dictionary.

Answer 61

d ={'k1':100,'k2':200} d OUT: d['k3']=300 d OUT: {'k1': 100, 'k2': 200, 'k3': 300}

Question 62

62. In dict, just needed to know the keys of the values.

Answer 62

.keys( )

Question 63

63. In dict, just needed to Values of the key.

Answer 63

.values ( )

Question 64

64. In dict, to see the pairs together.

Answer 64

.items( ) The results will be in parenthesis and this is called Tuples.

Question 65

Tuples 65. Write a note on Tuples?

Answer 65

1. Tuples are like lists but they are Immutable 2. Once an element is inside a tuple, it cannot be reassigned 3. Tuples use Parenthesis : eg. (123) 4. Can execute multiple commands like len, Indexing and Count be done.

Question 66

66. What is .count( ) ?

Answer 66

Count gives how many times an element in the tuple is present. example: t = ('a', 'a', 'c') t.count('a') OUT: 2

Question 67

67. In tuple, .index( )

Answer 67

Show the elements index where it appeared for the 1st time.

Question 68

68. When tuple is used?

Answer 68

Tuple is used when u are passing around objects and don't accidentally change.

Question 69

Sets 69. Define sets.

Answer 69

Sets are unordered collections of unique elements i.e. there can only be one representative of the same object.

Question 70

70. Adding an object to the set

Answer 70

myset = set( ) myset OUT: set( ) myset.add('apple') myset OUT: {'apple'} myset.add('apple) myset OUT : {'apple'} #comes the same, no two same values can be added in set.

Question 71

71. Having multiple values in set.

Answer 71

my list = [1,1,1,1,1,1,1,1,1,1,2,2,2,2,2,2,3,3,3,3] set(mylist) OUT: {1, 2, 3}

Question 72

Booleans 72. Define Booleans.

Answer 72

1. Booleans are operators that allow you to convey True or False statements. 2. These are very important when dealing with control flow and logic

Question 73

In booleans True and False , first letters should be in ____ letter.

Answer 73

Capital

Question 74

74. Example for Boolean.

Answer 74

1 > 2 OUT: False 1 == 1 OUT: True

Question 75

75. ____ function is used as a place holder

Answer 75

None

Question 76

a = 10 a + a OUT: 20 Reassigning: a = a + a OUT: 20 Using arithmetic operator addition: a += 10 What is the output?

Answer 76

OUT: 30

Question 77

77. %s

Answer 77

%s operator converts whatever it sees into a string, including integers and floats.

Question 78

78. %d

Answer 78

%d operator converts numbers to integers first, without rounding.

Question 79

79. %r

Answer 79

%r and repr() deliver the string representation of the object, including quotation marks and any escape characters.

Question 80

# String and List Python's built-in len( ) function counts all of the characters in the string, including ____ and ____

Answer 80

Spaces and Punctuation

Question 81

# Strings Strings are a ______

Answer 81

Sequence

Question 82

# Strings Indexing For indexing ______ notation is used

Answer 82

[ ]

Question 83

# String , Indexing Indexing starts at ____ index

Answer 83

0

Question 84

# String, Slicing ___ is used to perform slicing which can gran everything up-to a designated point

Answer 84

:

Question 85

# String , Slicing How to print a string backwards using slicing ? eg: 'Hello World'

Answer 85

s = 'Hello World' s[ : : -1 ] OUTPUT: 'dlroW olleH'

Question 86

# String , Slicing Grab everything past the first term all the way to the length of s s = 'Hello World'

Answer 86

s[ 1: ] OUTPUT: 'ello World'

Question 87

# String, Slicing S = "Hello World" Grab everything up to the 3rd index

Answer 87

s[ : 3 ]

Question 88

# String , Slicing s = 'Hello World' Grab everything

Answer 88

s[ : ]

Question 89

# String , Reverse Indexing Grab everything but the last letter s = 'Hello World'

Answer 89

s[ : -1 ]

Question 90

# String , Slicing s = 'Hello World' Grab everything, but go in step size of 2

Answer 90

[ : : -2 ]

Question 91

# String Strings have an important property known as ____.

Answer 91

Immutability

Question 92

# String What is Immutability?

Answer 92

Once a string is created, the elements within it can not be changed or replaced. eg. s = 'Akshita' s[0] = 'R' OUTPUT: ERROR

Question 93

# Strings , Built in methods Give few built in methods of a String.

Answer 93

.upper ( ) .lower ( ) .split ( ) There are many more methods

Question 94

# String , Print Formatting _____ method is used to add formatted objects to printed string statements.

Answer 94

.format( )

Question 95

# String, Print formatting Give an example for .format( )

Answer 95

'Insert curly brackets { }'.format('to the string') Output: 'Insert curly brackets to the string

Question 96

# Lists Can concatenation applied on lists

Answer 96

yes, Concatenation can be applied to lists merging to lists together.

Question 97

An advanced feature of list is called _______

Answer 97

List Comprehension

Question 98

_________ allow for quick construction of lists.

Answer 98

List Comprehension