np.empty() for uninitialized arrays in NumPy - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create an uninitialized NumPy array of shape (3, 3).

NumPy

import numpy as np
arr = np.[1]((3, 3))
print(arr)

Drag options to blanks, or click blank then click option'

Azeros

Bempty

Cones

Darray

Attempts:

3 left

💡 Hint

Common Mistakes

Using np.zeros() or np.ones() instead of np.empty()

Trying to pass shape as separate arguments instead of a tuple

The np.empty() function creates an uninitialized array of the given shape. It does not set values to zero or one.

2fill in blank

medium

Complete the code to create an uninitialized array of integers with shape (2, 4).

NumPy

import numpy as np
arr = np.empty((2, 4), dtype=[1])
print(arr)

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Aint

Bfloat

Cstr

Dbool

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'float' as dtype when integers are needed

Passing dtype as a string instead of a type

Setting dtype=int creates an array of integers. The np.empty() function does not initialize values.

3fill in blank

hard

Fix the error in the code to create an uninitialized array of shape (5,).

NumPy

import numpy as np
arr = np.empty([1])
print(arr)

Drag options to blanks, or click blank then click option'

A(5,)

B[5]

C5

D{5}

Attempts:

3 left

💡 Hint

Common Mistakes

Passing an integer instead of a tuple as shape

Using square brackets instead of parentheses for shape

The shape argument must be a tuple. For a 1D array of length 5, use (5,).

4fill in blank

hard

Fill both blanks to create an uninitialized 2D array of floats with shape (3, 2).

NumPy

import numpy as np
arr = np.[1]([2], dtype=float)
print(arr)

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Aempty

B(3, 2)

C[3, 2]

Dzeros

Attempts:

3 left

💡 Hint

Common Mistakes

Using zeros instead of empty

Passing shape as a list instead of a tuple

Use np.empty with a tuple shape (3, 2) to create an uninitialized 2D float array.

5fill in blank

hard

Fill all three blanks to create an uninitialized array with shape (4, 4), integer type, and print its shape.

NumPy

import numpy as np
arr = np.[1]([2], dtype=[3])
print(arr.shape)

Drag options to blanks, or click blank then click option'

Aempty

B(4, 4)

Cint

Dfloat

Attempts:

3 left

💡 Hint

Common Mistakes

Using float dtype instead of int

Passing shape as a list instead of a tuple

Use np.empty with shape (4, 4) and dtype=int to create the array. Printing arr.shape shows the array's dimensions.