Python Questions and Answers – Strings – 2

This set of Advanced Python Interview Questions & Answers focuses on “Strings”.

1. What is the output of the following code ?

1. class father:

2.     def __init__(self, param):

3.         self.o1 = param

5. class child(father):

6.     def __init__(self, param):

7.         self.o2 = param

9. >>>obj = child(22)

10. >>>print "%d %d" % (obj.o1, obj.o2)

a) None None
b) None 22
c) 22 None
d) Error is generated
View Answer

Answer:d
Explanation:self.o1 was never created.

2. What is the output of the following code ?

1. class tester:

2.     def __init__(self, id):

3.         self.id = str(id)

4.         id="224"

6. >>>temp = tester(12)

7. >>>print temp.id

a) 224
b) Error
c) 12
d) None
View Answer

Answer:c
Explanation:id in this case will be the attribute of the class.

3. What is the output of the following code ?

1. >>>example = "snow world"

2. >>>print "%s" % example[4:7]

a) wo
b) world
c) sn
d) rl
View Answer

Answer:a
Explanation:Execute in the shell and verify.

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4. What is the output of the following code ?

1. >>>example = "snow world"

2. >>>example[3] = 's'

3. >>>print example

a) snow
b) snow world
c) Error
d) snos world
View Answer

Answer:c
Explanation:Strings cannot be modified.

5. What is the output of the following code ?

1. >>>max("what are you")

a) Error
b) u
c) t
d) y
View Answer

Answer:d
Explanation:Max returns the character with the highest ascii value.

6. Given a string example=”hello” what is the output of example.count(l)
a) 2
b) 1
c) None
d) 0
View Answer

Answer:a
Explanation:l occurs twice in hello.

7. What is the output of the following code ?

1. >>>example = "helle"

2. >>>example.find("e")

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a) Error
b) -1
c) 1
d) 0
View Answer

Answer:c
Explanation:returns lowest index .

8. What is the output of the following code ?

1. >>>example = "helle"

2. >>>example.rfind("e")

a) -1
b) 4
c) 3
d) 1
View Answer

Answer:b
Explanation:returns highest index.

9. What is the output of the following code ?

1. >>>example="helloworld"

2. >>>example[::-1].startswith("d")

a) dlrowolleh
b) True
c) -1
d) None
View Answer

Answer:b
Explanation:Starts with checks if the given string starts with the parameter that is passed.

10. To concatenate two strings to a third what statements are applicable (multiple answers are allowed) ?
a) s3 = s1 + s2
b) s3 = s1.add(s2)
c) s3 = s1.__add__(s2)
d) s3 = s1 * s2
View Answer

Answer:a,c
Explanation:__add__ is another method that can be used for concatenation.