Category codes and labels in Pandas - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a categorical column from a list of colors.

Pandas

import pandas as pd
colors = ['red', 'blue', 'green', 'blue', 'red']
cat_colors = pd.Categorical([1])
print(cat_colors)

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

Apd.Series(colors)

B['red', 'blue']

C['green', 'blue']

Dcolors

Attempts:

3 left

💡 Hint

Common Mistakes

Passing a list with only some colors instead of the full list.

Passing a pandas Series instead of a list.

We pass the list colors directly to pd.Categorical() to create a categorical object.

2fill in blank

medium

Complete the code to get the category codes from the categorical data.

Pandas

import pandas as pd
colors = pd.Categorical(['red', 'blue', 'green', 'blue', 'red'])
codes = colors.[1]
print(codes)

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Alabels

Bvalues

Ccodes

Dcategories

Attempts:

3 left

💡 Hint

Common Mistakes

Using labels which is deprecated.

Using categories which returns category names, not codes.

The codes attribute gives the integer codes for each category in the categorical data.

3fill in blank

hard

Fix the error in the code to print the category labels of the categorical data.

Pandas

import pandas as pd
colors = pd.Categorical(['red', 'blue', 'green', 'blue', 'red'])
print(colors.[1])

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Alabels

Bcategories

Ccodes

Dvalues

Attempts:

3 left

💡 Hint

Common Mistakes

Using labels which is deprecated and causes error.

Using codes which returns integers, not labels.

The categories attribute returns the category labels (names) of the categorical data.

4fill in blank

hard

Fill both blanks to create a categorical from a list and print its codes.

Pandas

import pandas as pd
fruits = ['apple', 'banana', 'apple', 'orange']
cat_fruits = pd.Categorical([1])
print(cat_fruits.[2])

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Afruits

Bcodes

Ccategories

D['apple', 'banana']

Attempts:

3 left

💡 Hint

Common Mistakes

Using categories instead of codes for the second blank.

Passing a wrong list to pd.Categorical().

We create a categorical from the list fruits and then print its integer codes using codes.

5fill in blank

hard

Fill all three blanks to create a categorical with custom categories and print codes and categories.

Pandas

import pandas as pd
animals = ['cat', 'dog', 'bird', 'dog', 'cat']
cat_animals = pd.Categorical([1], categories=[2], ordered=True)
print(cat_animals.[3])
print(cat_animals.categories)

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Aanimals

B['dog', 'cat', 'bird']

Ccodes

D['cat', 'dog', 'bird']

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong order of categories.

Printing categories twice instead of codes and categories.

We create a categorical from animals with custom ordered categories ['dog', 'cat', 'bird']. Then we print the codes and categories.