Python Functions

Question 1

What will be the output of the following code :

print type(type(int))

• A. type 'int'
• B. type 'type'
• C. Error
• D. 0

Answer: (B)

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The type() function returns the class of the argument the object belongs to. Thus, type(int) returns which is of the type ‘type’ object.

Question 2

What is the output of the following code :

L = ['a','b','c','d']
print("".join(L))

• A. Error
• B. None
• C. abcd
• D. [‘a’,’b’,’c’,’d’]

Answer: (C)

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“” depicts a null string and the join function combines the elements of the list into a string.

Question 3

What is the output of the following segment :

chr(ord('A'))

• A. A
• B. B
• C. a
• D. Error

Answer: (A)

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ord() function converts a character into its ASCII notation and chr() converts the ASCII to character.

Question 4

What is the output of the following program :

y = 8
z = lambda x : x * y
print (z(6))

• A. 48
• B. 14
• C. 64
• D. None of the above

Answer: (A)

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lambdas are concise functions and thus, result = 6 * 8

Question 5

What is called when a function is defined inside a class?

• A. Module
• B. Class
• C. Another Function
• D. Method

Answer: (D)

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Explanation: When a function is defined inside a class then it is called Method. The method is accessible to data that is contained within the class.

Question 6

Which of the following is the use of id() function in python?

• A. Id returns the identity of the object
• B. Every object doesn’t have a unique id
• C. All of the mentioned
• D. None of the mentioned

Answer: (A)

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Each object in Python has a unique id. The id() function returns the object’s id.

Question 7

What is the output of the following program :

import re
sentence = 'horses are fast'
regex = re.compile('(?P<animal>w+) (?P<verb>w+) (?P<adjective>w+)')
matched = re.search(regex, sentence)
print(matched.groupdict())

• A. {‘animal’: ‘horses’, ‘verb’: ‘are’, ‘adjective’: ‘fast’}
• B. (‘horses’, ‘are’, ‘fast’)
• C. ‘horses are fast’
• D. ‘are’

Answer: (A)

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This function returns a dictionary that contains all the matches.

Question 8

Suppose list1 is [3, 4, 5, 20, 5, 25, 1, 3], what is list1 after list1.pop(1)?

• A. [3, 4, 5, 20, 5, 25, 1, 3]
• B. [1, 3, 3, 4, 5, 5, 20, 25]
• C. [3, 5, 20, 5, 25, 1, 3]
• D. [1, 3, 4, 5, 20, 5, 25]

Answer: (C)

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pop(i) removes the i^th index element from the list

Question 9

time.time() returns ________

• A. the current time
• B. the current time in milliseconds
• C. the current time in milliseconds since midnight
• D. the current time in milliseconds since midnight, January 1, 1970
• E. the current time in milliseconds since midnight, January 1, 1970 GMT (the Unix time)

Answer: (E)

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Question 10

Consider the results of a medical experiment that aims to predict whether someone is going to develop myopia based on some physical measurements and heredity. In this case, the input dataset consists of the person’s medical characteristics and the target variable is binary: 1 for those who are likely to develop myopia and 0 for those who aren’t. This can be best classified as

• A. Regression
• B. Decision Tree
• C. Clustering
• D. Association Rules

Answer: (B)

ISRO CS 2017 Python Functions
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Regression: It is a statistical analysis which is used to establish relation between a response and a predictor variable. It is mainly used in finance related applications. Decision Tree: Decision tree is a computational method which works on descriptive data and records the observations of each object to reach to a result. Clustering: It is a method of grouping more similar objects in a group and the non-similar objects to other groups. Association Rules: It uses if-then reasoning method using the support-confidence technique to give a result. According to the question Decision Tree is the most suitable technique that can be used to get best result of the experiment.