# Python Dictionary Quiz

123
 Question 1
Question 1:Find the output of the following program:
```D = dict()
for x in enumerate(range(2)):
D[x] = x
D[x+7] = x
print(D)

```
 A {0: 1, 7: 0, 1: 1, 8: 0} B {1: 1, 7: 2, 0: 1, 8: 1} C {0: 0, 7: 0, 1: 1, 8: 1} D KeyError
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Question 1 Explanation:
enumerate() will return a tuple, the loop will have x = (0, 0), (1, 1). Thus D = 0, D = 1, D[0 + 7] = D = 0 and D[1 + 7] = D = 1. Note: Dictionary is unordered, so the sequence of the key-value pair may differ in each output.
 Question 2
Question 2:Find the output of the following program:
```D = {1 : 1, 2 : '2', '1' : 1, '2' : 3}
D['1'] = 2
print(D[D[D[str(D)]]])

```
 A 2 B 3 C '2' D KeyError
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Question 2 Explanation:
Simple key-value pair is used recursively, D = 1, str(1) = ‘1’. So, D[str(D)] = D[‘1’] = 2, D = ‘2’ and D[‘2’] = 3.
 Question 3
Question 3:Find the output of the following program:
```D = {1 : {'A' : {1 : "A"}, 2 : "B"}, 3 :"C", 'B' : "D", "D": 'E'}
print(D[D[D]], end = " ")
print(D[D["A"]])

```
 A C B B E Key Error C B D D D B
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Question 3 Explanation:
Key-Value Indexing is used in the example above. D = {‘A’ : {1 : “A”}, 2 : “B”}, D = “B”, D[D] = D[“B”] = “D” and D[“D”] = “E”. D = {‘A’ : {1 : “A”}, 2 : “B”}, D[“A”] = {1 : “A”} and D[“A”] doesn’t exists, thus KeyError.
 Question 4
Question 4:Find the output of the following program:
```D = dict()
for i in range (3):
for j in range(2):
D[i] = j
print(D)

```
 A {0: 0, 1: 0, 2: 0} B {0: 1, 1: 1, 2: 1} C {0: 0, 1: 0, 2: 0, 0: 1, 1: 1, 2: 1} D TypeError: Immutable object
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Question 4 Explanation:
1st loop will give 3 values to i 0, 1 and 2. In the empty dictionary, valued are added and overwrited in j loop, for eg. D =  becomes D = 1, due to overwriting.
 Question 5
Question 5:Find the output of the following program:
```D = {1 : [1, 2, 3], 2: (4, 6, 8)}
D.append(4)
print(D, end = " ")
L = [D]
L.append(10)
D = tuple(L)
print(D)

```
 A [1, 2, 3, 4] ((4, 6, 8), 10) B [1, 2, 3, 4] (4, 6, 8, 10) C [1, 2, 3, 4] TypeError: tuples are immutable D [1, 2, 3, 4] [4, 6, 8, 10]
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Question 5 Explanation:
In the first part, key-value indexing is used and 4 is appended into the list. As tuples are immutable, in the second part the tuple is converted into a list, and value 10 is added finally then converted back to tuple.
 Question 6
Question 6:Find the output of the following program:
```a = {i: i * i for i in range(6)}
print (a)

```
 A Dictionary comprehension doesn’t exist B {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25, 6:36} C {0: 0, 1: 1, 4: 4, 9: 9, 16: 16, 25: 25} D {0: 0, 1: 1, 2: 4, 3: 9, 4: 16, 5: 25}
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Question 6 Explanation:
The above piece of code written in curly braces generate the whole Dictionary.
 Question 7
Question 7:Find the output of the following program:
```a ={}
a.fromkeys(['a', 'b', 'c', 'd'], 98)
print (a)

```
 A Syntax error B {‘a’:98, ‘b’:98, ‘c’:98, ‘d’:98} C {‘a’:None, ‘b’:None, ‘c’:None.’d’:None} D { }
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Question 7 Explanation:
fromkeys() create a new dictionary with keys from the list given to it as an argument and set values of the key, the default value given in it as an argument.
 Question 8
Question 8:Find the output of the following program:
```dict ={}
print (all(dict))

```
 A { } B False C True D An exception is thrown
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Question 8 Explanation:
The all() method returns:
• True – If all elements in an iterable are true ot iterable is empty.
• False – If any element in an iterable is false.
 Question 9
Question 9:Find the output of the following program:
```a = {'geeks' : 1, 'gfg' : 2}
b = {'geeks' : 2, 'gfg' : 1}
print (a == b)

```
 A True B False C Error D None
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Question 9 Explanation:
If two dictionary are the same it returns true, otherwise it returns false.
 Question 10
Question 10:Find the output of the following program: Which of these about a dictionary is false?
 A The values of a dictionary can be accessed using keys B The keys of a dictionary can be accessed using values C Dictionaries may or may not be ordered D None of the above
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Question 10 Explanation:
The values of a dictionary can be accessed using keys but the keys of a dictionary can’t be accessed using values.
There are 25 questions to complete.
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