Learn Python Basics for Data Analysis Quiz Answers

Question 1: What components define a variable in programming?

• Label, content
• Description, value
• Name, value
• Purpose, type

Question 2: Which of the two following answers are correct?    

• Variable names can start with an underscore.
• Variable names can start with a digit.
• Keywords cannot be used as a variable name.
• Variable names can have symbols like: @, #, $, etc.

Question 3: Which of these is not a Python data type?

• int
• string
• decimal
• float

Question 4: What values will the variables x and y hold after the following code has been executed?

x = 10
x += 12
y = x/4
x = x + y

• x will be 27, y will be 5.5
• x will be 27.5, y will be 7
• x will be 27, y will be 5
• x will be 27.5, y will be 5.5

Question 5: How can you change:

print(num)
{‘one’:1,’two’:3)
to
print(num)
{‘one’:1,’two’:2)

• num[2] = ‘two’
• num[1] = ‘two’
• num[‘two’] = 2
• num[‘two’] = ‘2’

Question 6: Which of the following are true of Python lists?

• All elements in a list must be of the same type.
• A list may contain any type of object except another list.
• These represent the same list:[‘a’, ‘b’, ‘c’] [‘c’, ‘a’, ‘b’]
• There is no conceptual limit to the size of a list.

Question 7: a = [‘foo’, ‘bar’, ‘baz’, ‘qux’, ‘quux’, ‘corge’]
Which of the following two codes display correct output?

• print(a[4:-2])
• print(a[-5:-3])
• print(a[-6])
• print(a[1])

Question 8: The code below is for different collections. Select the two code snippets that are correct.

colors = []
colors.append(‘Red’)
colors.append(‘Green’)
colors.append(‘Yellow’)
print(colors)

colors = []
colors.insert(‘Red’)
colors.insert(‘Green’)
colors.insert(‘Yellow’)
print(colors)

frequency = []
frequency[0] = ‘Monday’
frequency[1] = ‘friday’

frequency = [‘sunday’, ‘monday’, ‘tuesday’,’wednesday’]
frequency.remove(‘monday’)

Question 9: How to return the 5th element from the  test  list?

• test[5]
• test[4]
• test[‘5’]
• test[‘4’]

Question 10: What is used to concatenate two strings in Python?

• .  operator
• +  operator
• strcat()  function
• ^  operator

Question 11: Which of the following statements are true regarding parameters and return values of a function?

• Parameters of a function are variables defined inside a method signature as being necessary input for performing a task.
• Arguments are values sent to a method.
• Return values are the output, or in other words, the result a function needs to return.
• Parameters and return values are mandatory in functions.

Question 12: What will be the values of the variables x and  y  by the end of the execution?

• x -> 1, y -> 10
• x -> 22, y -> 64
• x -> 64, y -> 22
• x -> 1, y -> 64

Question 13: Which of the following statements is true?

• Functions are used to create objects in Python.
• Functions make your program run faster.
• A function is a piece of code that performs a specific task.
• All of the above.

Question 14: Which of the following items must be present in the function header?

• Function name
• Parameter list
• Return value
• def keyword

Question 15: Which the following statements are true regarding parameters and return values of a function?

• Methods are functions that are defined inside a class.
• Methods are functions only for string data types.
• A method can’t change the original object.
• You can call a method with the dot notation:  variableName.methodName()

Question 16: a = ‘This is a TEST’

Which of the following codes display the following output:

• print(a.capitalize())
• print(a.upper())
• print(a.lower())
• print(a.firstCapitalize())

Question 17: What is the output of the following snippet of code?

myDict = {‘George’: 4, ‘Jean’: 2, ‘Paul’: 10, ‘Andrew’: 18, ‘Jacob’: 8}
myDict[‘Steve’] = 12
toRemove = [‘George’, ‘Paul’, ‘Jacob’]
for elt in toRemove:
    myDict.pop(elt)
print(myDict.values())

• dict_values([2, 10, 18, 8, 12])
• dict_values([2, 10, 8, 12])
• dict_values([2, 18, 12])
• dict_values([12, 18, 2])

Question 18: Suppose you need to print e (exponential) constant defined in the math module. Which of the following code can you use?

print(math.e)
print(e)

from math import e
print(e)

from math import e
print(math.e)

Question 19: Which operator is used in Python to import modules from packages?

• =  operator
• _  operator
• operator
• .  operator

Question 20:According to the following code, what are the correct outputs?

import numpy as np
myNotes = np.array([0, 5, 10, 15, 20])

• myNotes.mean()
• myNotes[1]
• myNotes.sum()/5
• myNotes.max()