Output of python program | Set 14 (Dictionary)
Prerequisite: Dictionary
Note: Output of all these programs is tested on Python3
1) What is the output of the following program?
PYTHON3
D = dict () for x in enumerate ( range ( 2 )): D[x[ 0 ]] = x[ 1 ] D[x[ 1 ] + 7 ] = x[ 0 ] print (D) |
a) KeyError
b) {0: 1, 7: 0, 1: 1, 8: 0}
c) {0: 0, 7: 0, 1: 1, 8: 1}
d) {1: 1, 7: 2, 0: 1, 8: 1}
Ans. (c)
Explanation: enumerate() will return a tuple, the loop will have x = (0, 0), (1, 1). Thus D[0] = 0, D[1] = 1, D[0 + 7] = D[7] = 0 and D[1 + 7] = D[8] = 1.
Note: Dictionary is unordered, so the sequence of the key-value pair may differ in each output.
2) What is the output of the following program?
PYTHON3
D = { 1 : 1 , 2 : '2' , '1' : 2 , '2' : 3 } D[ '1' ] = 2 print (D[D[D[ str (D[ 1 ])]]]) |
a) 2
b) 3
c) β2β
d) KeyError
Ans. (b)
Explanation: Simple key-value pair is used recursively, D[1] = 1, str(1) = β1β. So, D[str(D[1])] = D[β1β] = 2, D[2] = β2β and D[β2β] = 3.
3) What is the output of the following program?
PYTHON3
D = { 1 : { 'A' : { 1 : "A" }, 2 : "B" }, 3 : "C" , 'B' : "D" , "D" : 'E' } print (D[D[D[ 1 ][ 2 ]]], end = " " ) print (D[D[ 1 ][ "A" ][ 2 ]]) |
a) D C
b) E B
c) D B
d) E KeyError
Ans. (d)
Explanation: Key-Value Indexing is used in the example above. D[1] = {βAβ : {1 : βAβ}, 2 : βBβ}, D[1][2] = βBβ, D[D[1][2]] = D[βBβ] = βDβ and D[βDβ] = βEβ. D[1] = {βAβ : {1 : βAβ}, 2 : βBβ}, D[1][βAβ] = {1 : βAβ} and D[1][βAβ][2] doesnβt exists, thus KeyError.
4) What is the output of the following program?
PYTHON3
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
Ans. (b)
Explanation: 1st loop will give 3 values to i 0, 1 and 2. In the empty dictionary, values are added and overwritten in j loop, for eg. D[0] = [0] becomes D[0] = 1, due to overwriting.
5) Which of the options below could possibly be the output of the following program?
PYTHON3
D = { 1 : [ 1 , 2 , 3 ], 2 : ( 4 , 6 , 8 )} D[ 1 ].append( 4 ) print (D[ 1 ], end = " " ) L = [D[ 2 ]] L.append( 10 ) D[ 2 ] = tuple (L) print (D[ 2 ]) |
a) [1, 2, 3, 4] [4, 6, 8, 10]
b) [1, 2, 3, 4] ((4, 6, 8), 10)
c) β[1, 2, 3, 4] TypeError: tuples are immutable
d) [1, 2, 3, 4] (4, 6, 8, 10)
Ans. (b)
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 to the new list βLβ then converted back to a tuple.
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