Practice

What does NumPy primarily provide?

• Data visualization tools

• Array objects and numerical operations

• Machine learning algorithms

• Web frameworks

Which of the following creates a NumPy array of zeros?

• numpy.zeros((3,3))

• numpy.ones((3,3))

• numpy.array((0,0))

• numpy.zeros.array((3,3))

What is the shape of this array? np.array([[1,2,3],[4,5,6]])

• (3, 2)

• (2, 3)

• (1, 6)

• (6,)

How can you find the data type of elements in a NumPy array?

• array.type()

• array.dtype

• array.datatype()

• array.gettype()

What will np.array([1,2,3]) + np.array([4,5,6]) return?

• [1, 2, 3, 4, 5, 6]

• [4, 10, 18]

• [5, 7, 9]

• Error

Which of the following reshapes an array arr to 2 rows and 3 columns?

• arr.resize(2, 3)

• arr.flatten(2, 3)

• arr.shape(2, 3)

• arr.reshape(2, 3)

What is a DataFrame?

• A single row of data

• A 2D labeled data structure

• A 1D labeled array

• A chart

Which method reads a CSV file into a DataFrame?

• pd.load_csv()

• pd.read_file()

• pd.read_csv()

• pd.load_file()

How do you display the first 5 rows of a DataFrame df?

• df.top()

• df.head()

• df.first()

• df.show()

Which method checks for missing values?

• isnull()

• isempty()

• checknull()

• isna()