Python Technical Questions & Answers on “While/For Loops”.
1. What will be the output of the following Python code?
for i in range(10): if i == 5: break else: print(i) else: print("Here")
a) 0 1 2 3 4 Here
b) 0 1 2 3 4 5 Here
c) 0 1 2 3 4
d) 1 2 3 4 5
Answer: c
Clarification: The else part is executed if control doesn’t break out of the loop.
2. What will be the output of the following Python code?
for i in range(5): if i == 5: break else: print(i) else: print("Here")
a) 0 1 2 3 4 Here
b) 0 1 2 3 4 5 Here
c) 0 1 2 3 4
d) 1 2 3 4 5
Answer: a
Clarification: The else part is executed if control doesn’t break out of the loop.
3. What will be the output of the following Python code?
x = (i for i in range(3)) for i in x: print(i)
a) 0 1 2
b) error
c) 0 1 2 0 1 2
d) none of the mentioned
Answer: a
Clarification: The first statement creates a generator object.
4. What will be the output of the following Python code?
x = (i for i in range(3)) for i in x: print(i) for i in x: print(i)
a) 0 1 2
b) error
c) 0 1 2 0 1 2
d) none of the mentioned
Answer: a
Clarification: We can loop over a generator object only once.
5. What will be the output of the following Python code?
string = "my name is x" for i in string: print (i, end=", ")
a) m, y, , n, a, m, e, , i, s, , x,
b) m, y, , n, a, m, e, , i, s, , x
c) my, name, is, x,
d) error
Answer: a
Clarification: Variable i takes the value of one character at a time.
6. What will be the output of the following Python code?
string = "my name is x" for i in string.split(): print (i, end=", ")
a) m, y, , n, a, m, e, , i, s, , x,
b) m, y, , n, a, m, e, , i, s, , x
c) my, name, is, x,
d) error
Answer: c
Clarification: Variable i takes the value of one word at a time.
7. What will be the output of the following Python code snippet?
a = [0, 1, 2, 3] for a[-1] in a: print(a[-1])
a) 0 1 2 3
b) 0 1 2 2
c) 3 3 3 3
d) error
Answer: b
Clarification: The value of a[-1] changes in each iteration.
8. What will be the output of the following Python code snippet?
a = [0, 1, 2, 3] for a[0] in a: print(a[0])
a) 0 1 2 3
b) 0 1 2 2
c) 3 3 3 3
d) error
Answer: a
Clarification: The value of a[0] changes in each iteration. Since the first value that it takes is itself, there is no visible error in the current example.
9. What will be the output of the following Python code snippet?
a = [0, 1, 2, 3] i = -2 for i not in a: print(i) i += 1
a) -2 -1
b) 0
c) error
d) none of the mentioned
Answer: c
Clarification: SyntaxError, not in isn’t allowed in for loops.
10. What will be the output of the following Python code snippet?
string = "my name is x" for i in ' '.join(string.split()): print (i, end=", ")
a) m, y, , n, a, m, e, , i, s, , x,
b) m, y, , n, a, m, e, , i, s, , x
c) my, name, is, x,
d) error
Answer: a
Clarification: Variable i takes the value of one character at a time.
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