dictionary

Question 1

d = {100:’durga’, 101:’ravi’, 102:’sagar’, 103:’chetan’}
d.setdefault(100,”Suhail”)
d
d.setdefault(200,”Ishita”)
d
d.setdefault(500)
d

Answer 1

> > > d.setdefault(100,”Suhail”)
‘durga’
d
{100:’durga’, 101:’ravi’, 102:’sagar’, 103:’chetan’}
d.setdefault(200,”Ishita”)
‘Ishita’
d
{100: ‘durga’, 101: ‘ravi’, 102: ‘sagar’, 103: ‘chetan’, 200: ‘Ishita’}
d.setdefault(500)
d
{100: ‘durga’, 101: ‘ravi’, 102: ‘sagar’, 103: ‘chetan’, 200: ‘Ishita’, 500: None}

Question 2

Syntax of update()

Answer 2

dictionary.update(iterable)

iterable: A dictionary

Question 3

Slicing is allowed in dictionary?

Answer 3

No

Question 4

How to get items of dict using for loop

Answer 4

For k,v in d.items():
print(k,v)

Question 5

If the specified value in pop() of dict and also default value is not given then

Answer 5

KeyError

Question 6

Datatype of values of dictionary

Answer 6

Any data type

Question 7

car = {
“brand”: “Ford”,
“model”: “Mustang”,
“year”: 1964
}

x = car.pop(“model”)

print(x)

Answer 7

Mustang

Question 8

Return type of popitem()

Answer 8

tuple

Question 9

How to get values of dict using for loop

Answer 9

For v in d.values():
print(v)

Question 10

In dictionary, are duplicates allowed

Answer 10

For keys duplicates are not allowed
For values duplicates are allowed

Question 11

How we can remove all entries from the dict but after deleting the elements still we can access dict

Answer 11

d.clear()

Question 12

How do you create empty dictionary?

Answer 12

d = { }
Or
d = dict()

Question 13

Take table
__________________
100 | ‘Krishna’
__________________
200 | ‘Ravi’
__________________
300 | ‘Shiva’
__________________

Write code for this table in python

Answer 13

d = {100: ‘Krishna’, 200: ‘Ravi’, 300: ‘Shiva’}

Question 14

d = {100:’durga’, 200:’ravi’, 300:’shiva’}
print(del d[100])
print(d)
print(del d[400])
print(d)

Answer 14

SyntaxError: invalid syntax
print(del d[100])
^^^

Question 15

Dictionaries are mutable or immutable

Answer 15

Mutable

Question 16

car = {
“brand”: “Ford”,
“model”: “Mustang”,
“year”: 1964
}

x = car.get(“hi”)

print(x)

Answer 16

None

Question 17

get()

Answer 17

• Return the value associated with the key
• It doesn’t gives error

Dict

Question 18

How to removes the item that was last inserted into the dictionary.

Answer 18

popitem() method

Question 19

Syntax of d.pop()

Answer 19

dictionary.pop(keyname, defaultvalue)

keyname: Required. The keyname of the item you want to remove

defaultvalue: Optional. A value to return if the specified key do not exist.
If this parameter is not specified, and the no item with the specified key is found, an error is raised

Question 20

Syntax of get()

Answer 20

dictionary.get(keyname, value)

keyname: Required. The keyname of the item you want to return the value from

value: Optional. A value to return if the specified key does not exist. Default value None

Question 21

car = {
“brand”: “Ford”,
“model”: “Mustang”,
“year”: 1964
}

x = car.get(“price”, 15000)

print(x)

Answer 21

15000

Question 22

How to get keys in python using for loop of dict

Answer 22

d = {100:’durga’, 200:’ravi’, 300:’shiva’}
for k in d.keys():
print(k)

100
200
300

Question 23

How to get each key value pair of dict

Answer 23

items()

Question 24

data types of items of dictionary

Answer 24

Dictionary items contain 2 things
key values

Data type of Keys: Immutable: int, str, tuples, booleans, None,
frozenset
List, dictionaries, set can’t be used as keys as they are mutable

Data type of values: Any data type

Question 25

len() in dict

Answer 25

Returns the number of items in dict

Question 26

Indexing is allowed in dictionary?

Answer 26

No, even they preserved insertion order

Question 27

Is dictionary changeable or not?

Answer 27

Changeable

Question 28

How can we delete dict that we can’t even accessed it

Answer 28

del d

Question 29

d[key1] = value1 If key1 is not present in dict, what will happen

Answer 29

new item will be added to dict i.e.key1:value1

Question 30

How to returns the value of the item with the specified key. If the key does not exist, it inserts the key with the specified value in dict if the key does not exist and the specififed value is also not given then it will add that key with none in dict In dict

Answer 30

setdefault()

Question 31

Syntax of items()

Answer 31

dictionary.items() No parameters

Question 32

type of output of get()

Answer 32

str

Question 33

Dictionary is ordered or not?

Answer 33

In python 3.6 or early, dictionary was unordered now from 3.7, dictionary is ordered

Question 34

d = {100:’Durga’, 200:’ravi’} print(d[100]) print(d[400])

Answer 34

durga KeyError: 400

Question 35

When we use get(), If specified key is not present in dict and also default value is not given then

Answer 35

Get None

Question 36

Dictionaries are dynamic or not

Answer 36

Dynamic i.e. 1. You can modify a dictionary after its creation by adding, updating, or deleting key-value pairs. 2. Dictionaries can grow and shrink dynamically in size as you modify them.

Question 37

How can you access the data from dictionary also example

Answer 37

By using keys d = {100:’Durga’, 200:’Ravi’, 300:’Shiva’} print([d[100]) #Durga

Question 38

Syntax of setdefault()

Answer 38

dictionary.setdefault(keyname, value) keyname Required. The keyname of the item you want to return the value from value Optional. If the key exist, this parameter has no effect. If the key does not exist, this value becomes the key's value Default value None

Question 39

Syntax of values()

Answer 39

dictionary.values() No parameters

Question 40

squares = {x: x*x for x in range(1,6)}

Answer 40

{1: 1, 2: 4, 3: 9, 4: 16, 5: 25}

Question 41

copy()

Answer 41

The copy() method returns a copy of the specified dictionary. (Cloned copy)

Question 42

How to delete elements from dictionary

Answer 42

By using 1.) del d[key] 2.) d.clear() 3.) del d

Question 43

Type of output of values in dict and explain it

Answer 43

Its the view which display a list of the ditionary's key-value tuples but the view is not the list, it csn be converted into one

Question 44

What type of objects are allowed in dictionary? for keys For values (heterogeneous /homogeneous)

Answer 44

heterogeneous for both keys and values

Question 45

del d[key] If key is not present in dict then?

Answer 45

we will get keyError

Question 46

If the key does not exist in setdefault(), then

Answer 46

* If the key does not exist, this value becomes the key's value. * Default value None

Question 47

How to get value associated with the key

Answer 47

dictionary.get(keyname, value)

Question 48

Syntax of popitem()

Answer 48

dictionary.popitem() No parameters

Question 49

setdefault()

Answer 49

The setdefault() method returns the value of the item with the specified key. If the key does not exist, insert the key, with the specified value Default value None In dict

Question 50

d = {100:'durga', 200:'ravi', 300:'shiva'} del d[100] print(d) Del d[400] print(d)

Answer 50

{200:’ravi’, 300:’shiva’} KeyError: 400

Question 51

How to return all values associated with the dictionary

Answer 51

Using values()

Question 52

d = {100:'durga', 200:'ravi', 300:'shiva'} del d print(d)

Answer 52

NameError

Question 53

d = {100:'durga', 200:'ravi', 300:'shiva'} print(d.values())

Answer 53

dict_values(['durga', 'ravi', 'shiva'])

Question 54

How to remove the entry associated with specified key and return corresponding value in dict

Answer 54

Using pop()

Question 55

How to deletes entry associated with the specified key in dict

Answer 55

del d[key]

Question 56

d = {100:'durga', 200:'ravi', 300:'shiva'} print(d.pop(100)) print(d) print(d.pop(400)

Answer 56

durga {200:'ravi', 300:'shiva'} KeyError: 400

Question 57

d = {} d.popitem()

Answer 57

KeyError

Question 58

d[key1] = value1 If key1 is already present in dict, what will happen

Answer 58

The old value will be replace by new value i.e. value1

Question 59

values()

Answer 59

Returns all values associated with dictionary

Question 60

car = { "brand": "Ford", "model": "Mustang", "year": 1964 } x = car.get("model") print(x)

Answer 60

Mustang

Question 61

How do you create dictionary?

Answer 61

d= { } OR d = dict()

Question 62

Syntax of copy()

Answer 62

dictionary.copy() No parameters

Question 63

How to inserts the specified dictionary to the dictionary.

Answer 63

dictionary.update(dictionary)

Question 64

What type of brackets are used in to create dictionary?

Answer 64

Curly brackets { }

Question 65

doubles = {x: 2*x for x in range(1,6)}

Answer 65

{1: 2, 2: 4, 3: 6, 4: 8, 5: 10}

Question 66

d.pop()

Answer 66

Removes the entry associated with the specified key and returns the corresponding value

Question 67

How do we update dictionary?

Answer 67

d[key] = value If the key is not available then a new item will be added to dict If the key is already present the old value will be replace by new value

Question 68

How can we create duplicate dictionary (cloned one)

Answer 68

copy()

Question 69

clear()

Answer 69

To remove all entries from the dictionary

Question 70

d = {100:'durga', 200:'ravi', 300:'shiva'} for v in d.values(): print(v)

Answer 70

durga ravi shiva

Question 71

When we access dict by using keys and the specified key is not available then what will happen

Answer 71

You will get KeyError

Question 72

d = {100:'durga', 200:'ravi', 300:'shiva'} print(d.popitem()) print(d)

Answer 72

(300, 'shiva') {100: 'durga', 200: 'ravi'}

Question 73

Dictionary comprehension is applicable or not

Answer 73

Yes

Question 74

type of dictionary

Question 75

car = { "brand": "Ford", "model": "Mustang", "year": 1964 } car.pop("model") print(car)

Answer 75

{'brand': 'Ford', 'year': 1964}

Question 76

d={100:'durga',200:'ravi',300:'shiva'} d.get(100) d.get(400) d.get(100,"Guest") d.get(400,"Guest")

Answer 76

'durga' None 'durga' 'Guest'

Question 77

Give example of dict comprehension

Answer 77

Squares = {x: x*x for x in range(1,6)} print(squares) #{1:1, 2:4, 3:9, 4:16, 5:25}

Question 78

update()

Answer 78

The update() method inserts the specified items to the dictionary. The specified items can be a dictionary, or an iterable object with key value pairs.

Question 79

del d

Answer 79

To delete total dictionary that we cannot accessed it after deletion

Question 80

popitem()

Answer 80

The popitem() method removes the item that was last inserted into the dictionary. In versions before 3.7, the popitem() method removes a random item.

Question 81

d = {100:'durga', 200:'ravi', 300:'shiva'} print(d) d.clear() print(d)

Answer 81

{100:'durga', 200:'ravi', 300:'shiva'} { }

Question 82

return type of get()

Answer 82

'str'

Question 83

return type of d.pop()

Answer 83

'str'

Question 84

return type of popitem()

Answer 84

tuple

Question 85

return type of keys()

Question 86

return type of values()

Question 87

return type of items()

Question 88

return type of setdefault()

Answer 88

'str'

Question 89

/ /

Answer 89

Returns a view which display a list of the dictionary's (keys/values/key-value tuples) but the view is not a list, it can be converted into one