🌍 All Study Guides 📊 Dashboard 📰 Blog 💡 About

IBM Applied AI to IBM AI Developer Professional Certificate • STUDY MODE

PRACTICE QUIZ

QUESTION 1 OF 46

What are the most common modes used when opening a file?

(a)ppend, (r)edline, (w)rite

(a)ppend, (r)ead, (w)riteCorrect Answer

(s)ave, (r)ead, (w)rite

(a)ppend, (c)lose, (w)rite

QUESTION 2 OF 46

What is the data attribute that will return the title of the file?

File1.nameCorrect Answer

File1.mode

File1.open()

File1.close()

QUESTION 3 OF 46

What is the command that tells Python to begin a new line?

\nCorrect Answer

QUESTION 4 OF 46

What attribute is used to input data into a file?

File1.write()Correct Answer

File1.open()

File1.read()

File1.close()

QUESTION 5 OF 46

What does the attribute name of the file object display ?

The name of the fileCorrect Answer

The mode of the file

QUESTION 6 OF 46

What is the advantage of using the with statement to open a file

it automatically closes the file objectCorrect Answer

it saves a backup

QUESTION 7 OF 46

Consider the file object File1 in write mode, what would the following line of code write to the file: File1.write("Hello\n world") world (CORRECT)

Hello\n world

Hello

Hello world

Explanation:

the \n represents a new line PRACTICE QUIZ

QUESTION 8 OF 46

What python object do you cast to a dataframe?

set

tuple

dictionaryCorrect Answer

QUESTION 9 OF 46

How would you access the first-row and first column in the dataframe df?

df.ix[0,0]Correct Answer

df.ix[0,1]

df.ix[1,0]

QUESTION 10 OF 46

What is the proper way to load a CSV file using pandas?

pandas.from_csv(‘data.csv’)

pandas.load_csv(‘data.csv’)

pandas.read_csv(‘data.csv’)Correct Answer

pandas.import_csv(‘data.csv’)

QUESTION 11 OF 46

Use this dataframe to answer the question. ( Image S2Q4 ) How would you select the Genre disco? Select all that apply.

df.iloc[6, ‘genre’]

df.loc[6, 5]

df.iloc[6, 4]Correct Answer

df.loc[‘Bee Gees’, ‘Genre’]

QUESTION 12 OF 46

Use this dataframe to answer the question. ( Image S2Q5 ) Which will NOT evaluate to 20.6? Select all that apply.

df.iloc[4,5]

df.iloc[6,5]

df.loc[4,’Music Recording Sales’]Correct Answer

df.iloc[6, ‘Music Recording Sales (millions)’]Correct Answer

QUESTION 13 OF 46

Use this dataframe to answer the question. ( Image S2Q6 ) How do we select Albums The Dark Side of the Moon to Their Greatest Hits (1971-1975)? Select all that apply. PRACTICE QUIZ

df.iloc[2:5, ‘Album’]

df.loc[2:5, ‘Album’]Correct Answer

df.iloc[2:6, 1]Correct Answer

df.loc[2:5, 1]

QUESTION 14 OF 46

What is the Python library used for scientific computing and is a basis for Pandas?

Tkinter

Requests

NumpyCorrect Answer

datetime

QUESTION 15 OF 46

What attribute is used to retrieve the number of elements in an array?

a.sizeCorrect Answer

a.ndim

a.shape

a.dtype

QUESTION 16 OF 46

How would you change the first element to "10" in this array c:array([100,1,2,3,0])?

c[2]=10

c[1]=10

c[0]=10Correct Answer

c[4]=10

QUESTION 17 OF 46

What attribute is used to return the number of dimensions in an array?

a.size

a.shape

a.ndimCorrect Answer

a.dtype

QUESTION 18 OF 46

what is the type of the following array: a=np.array([0,1,7,3, 7])

int

numpy.ndarrayCorrect Answer

QUESTION 19 OF 46

consider the following lines of code: c=np.array([20,1,2,3,4]) c[0]=100 c[0]=2 what is the value of c[0]

100

2Correct Answer

QUESTION 20 OF 46

consider the numpy array u how would you multiply each element in the numpy array by 2

2*uCorrect Answer

[2,2]*u

QUESTION 21 OF 46

how would you perform the dot product between the numpy arrays u and v

np.dot(u,v)Correct Answer

u*v

QUESTION 22 OF 46

what is the shape of the following array: A=np.array([[1,0,1],[0,1,1]])

(2,3)Correct Answer

(3,2)

Explanation:

the first element of the tuple is the number of rows the second is the number of columns

QUESTION 23 OF 46

consider the following array: A=np.array([[1,0,1],[2,2,2]]) what is the value in A[0,1]?

0Correct Answer

QUESTION 24 OF 46

What is the result of the following operation: Y=np.array([[2,1],[1,2]]) Z=2*Y [2, 4]]) (CORRECT) [2, 2]]) [1, 2]])

array([[4, 2],

array([[2, 2],

array([[2, 1],

Explanation:

multiplying the array by two doubles each element MODULE 4 GRADED QUIZ

QUESTION 25 OF 46

What is the result of the following lines of code? a=np.array([0,1]) b=np.array([1,0]) np.dot(a,b)

0Correct Answer

array([1,1])

QUESTION 26 OF 46

What is the value of Z after the following code is run? X=np.array([[1,0],[0,1]]) Y=np.array([[0,1],[1,0]]) Z=X+Y

array([[1,1],[1,1]])Correct Answer

array([[1,0],[0,1]])

array([[0,1],[1,1]])

Explanation:

the '+' corresponds to matrix addition

QUESTION 27 OF 46

What values does the variable out take if the following lines of code are run? X=np.array([[1,0,1],[2,2,2]]) out=X[0:2,2] out Explanation, the first index corresponds to the rows the second index corresponds to the columns

array([1,0])

array([1,2])Correct Answer

array([1,1])

QUESTION 28 OF 46

What do the following lines of code do? with open("Example1.txt","r") as file1: FileContent=file1.readlines() print(FileContent) Explanation, the mode is set to r for read.

Read the file "Example1.txt"Correct Answer

Write to the file “Example1.txt”

Append the file "Example1.txt"

QUESTION 29 OF 46

What do the following lines of code do? with open("Example.txt","w") as writefile: writefile.write("This is line A\n") writefile.write("This is line B\n")

Read the file "Example.txt"

Write to the file “Example.txt”Correct Answer

Append the file "Example.txt"

QUESTION 30 OF 46

What do the following lines of code do? with open("Example3.txt","w") as file1: file1.write("This is line C\n")

Read the file "Example3.txt".

Append the file "Example3.txt".

errorCorrect Answer

Explanation:

There is no indent.

QUESTION 31 OF 46

Consider the dataframe df. How would you access the element in the 2nd row and 1st column?

df.iloc[1,0]Correct Answer

df.iloc[2,1]

df.iloc[0,1]

QUESTION 32 OF 46

In the lab, you learned you can also obtain a series from a dataframe df, select the way to assign the column with the header Length to a pandas series to the variable x.

x=df['Length']Correct Answer

x=df[['Length']]

x=df.[['Length']]

QUESTION 33 OF 46

What is the result of the following lines of code? a=np.array([-1,1]) b=np.array([1,1]) np.dot(a,b)

array([0,2])

0Correct Answer

QUESTION 34 OF 46

How do you perform matrix multiplication on the numpy arrays A and B ?

A+B

A*B

np.dot(A,B)Correct Answer

QUESTION 35 OF 46

What values does the variable out take if the following lines of code are run? X=np.array([[1,0,1],[2,2,2]]) out=X[0,1:3] out Explanation, the first index corresponds to the rows the second index corresponds to the columns

array([0,1])Correct Answer

array([1,0,1])

array([2,2])

QUESTION 36 OF 46

What is the value of Z after the following code is run? X=np.array([[1,0],[0,1]]) Y=np.array([[2,2],[2,2]]) Z=np.dot(X,Y) Explanation, the dot function corresponds to matrix multiplication

array([[2,2],[2,2]])Correct Answer

array([[2,0],[0,2] ])

array([[3,2],[2,3]])

QUESTION 37 OF 46

Consider the following text file: Example1.txt: This is line 1 This is line 2 This is line 3 What is the output of the following lines of code? with open("Example1.txt","r") as File1: file_stuff=File1.readline () print(file_stuff) This is line 2 This is line 3 This is line 2

This is line 1Correct Answer

This is line 1

QUESTION 38 OF 46

What task do the following lines of code perform? with open('Example2.txt','r') as readfile: with open('Example3.txt','w') as writefile: for line in readfile: writefile.write(line)

Check the mode of the open function for each file object.

Copy the text from Example2.txt to Example3.txt.Correct Answer

Print out the content of Example2.txt.

QUESTION 39 OF 46

What function would you use to load a csv file in Pandas?

pd.read_csvCorrect Answer

pd.read_excel

QUESTION 40 OF 46

What is the value of Z after the following code is run? X=np.array([[1,0],[0,1]]) Y=np.array([[2,1],[1,2]]) Z=np.dot(X,Y) Explanation, the dot function corresponds to matrix multiplication

array([[2,1],[1,2] ])Correct Answer

array([[2,0],[1,0]])

array([[3,1],[1,3] ])

QUESTION 41 OF 46

Consider the following line of code: with open(example1,"r") as file1: What mode is the file object in? Explanation, the mode is set to r for read.

readCorrect Answer

write

append

QUESTION 42 OF 46

What do the following lines of code do? with open("Example.txt","a") as writefile: writefile.write("This is line A\n") writefile.write("This is line B\n")

Read the file "Example.txt"

Append the file "Example.txt"Correct Answer

Write to the file “Example.txt”

QUESTION 43 OF 46

Consider the dataframe df. How would you access the element in the 1st row 3rd column

df.iloc[2,0]

df.iloc[1,3]

df.iloc[0,2]Correct Answer

QUESTION 44 OF 46

What method gets the unique elements of the following: df[)Length)] ?

uniqueCorrect Answer

head

QUESTION 45 OF 46

What values does the variable out take if the following lines of code are run? X=np.array([[1,0,1],[2,2,2]]) out=X[0:2,2] out Explanation, the first index corresponds to the rows the second index corresponds to the columns

array([1,0])

array([1,2])Correct Answer

array([1,1])

QUESTION 46 OF 46

Consider the following text file: Example1.txt: This is line 1 This is line 2 This is line 3 What is the output of the following lines of code? with open("Example1.txt","r") as file1: FileContent=file1.read() print(FileContent) This is line 2 This is line 3 (CORRECT)

This is line 1

Ready to test your recall?

What are the most common modes used when opening a file?

(a)ppend, (r)edline, (w)rite

(a)ppend, (r)ead, (w)rite

(s)ave, (r)ead, (w)rite

(a)ppend, (c)lose, (w)rite

How confident are you in this answer?