Python Questions and Answers for Freshers on “While and For Loops”.
1. What will be the output of the following Python code?
x = 123 for i in x: print(i)
a) 1 2 3
b) 123
c) error
d) none of the mentioned
Answer: c
Clarification: Objects of type int are not iterable.
2. What will be the output of the following Python code?
d = {0: 'a', 1: 'b', 2: 'c'} for i in d: print(i)
a) 0 1 2
b) a b c
c) 0 a 1 b 2 c
d) none of the mentioned
Answer: a
Clarification: Loops over the keys of the dictionary.
3. What will be the output of the following Python code?
d = {0: 'a', 1: 'b', 2: 'c'} for x, y in d: print(x, y)
a) 0 1 2
b) a b c
c) 0 a 1 b 2 c
d) none of the mentioned
Answer: d
Clarification: Error, objects of type int aren’t iterable.
4. What will be the output of the following Python code?
d = {0: 'a', 1: 'b', 2: 'c'} for x, y in d.items(): print(x, y)
a) 0 1 2
b) a b c
c) 0 a 1 b 2 c
d) none of the mentioned
Answer: c
Clarification: Loops over key, value pairs.
5. What will be the output of the following Python code?
d = {0: 'a', 1: 'b', 2: 'c'} for x in d.keys(): print(d[x])
a) 0 1 2
b) a b c
c) 0 a 1 b 2 c
d) none of the mentioned
Answer: b
Clarification: Loops over the keys and prints the values.
6. What will be the output of the following Python code?
d = {0: 'a', 1: 'b', 2: 'c'} for x in d.values(): print(x)
a) 0 1 2
b) a b c
c) 0 a 1 b 2 c
d) none of the mentioned
Answer: b
Clarification: Loops over the values.
7. What will be the output of the following Python code?
d = {0: 'a', 1: 'b', 2: 'c'} for x in d.values(): print(d[x])
a) 0 1 2
b) a b c
c) 0 a 1 b 2 c
d) none of the mentioned
Answer: d
Clarification: Causes a KeyError.
8. What will be the output of the following Python code?
d = {0, 1, 2} for x in d.values(): print(x)
a) 0 1 2
b) None None None
c) error
d) none of the mentioned
Answer: c
Clarification: Objects of type set have no attribute values.
9. What will be the output of the following Python code?
d = {0, 1, 2} for x in d: print(x)
a) 0 1 2
b) {0, 1, 2} {0, 1, 2} {0, 1, 2}
c) error
d) none of the mentioned
Answer: a
Clarification: Loops over the elements of the set and prints them.
10. What will be the output of the following Python code?
d = {0, 1, 2} for x in d: print(d.add(x))
a) 0 1 2
b) 0 1 2 0 1 2 0 1 2 …
c) None None None
d) None of the mentioned
Answer: c
Clarification: Variable x takes the values 0, 1 and 2. set.add() returns None which is printed.
11. What will be the output of the following Python code?
for i in range(0): print(i)
a) 0
b) no output
c) error
d) none of the mentioned
Answer: b
Clarification: range(0) is empty.
questions on Python for freshers,