apply() on columns in Pandas - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to apply a function to each element in the 'age' column.

Pandas

df['age'] = df['age'].[1](lambda x: x + 1)

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Areduce

Bmap

Cfilter

Dapply

Attempts:

3 left

💡 Hint

Common Mistakes

Using map instead of apply, which works differently on Series.

Using filter, which is for filtering elements, not transforming.

The apply method lets you run a function on each element of a column.

2fill in blank

medium

Complete the code to apply a function to each column in the DataFrame.

Pandas

result = df.[1](sum)

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Aapplymap

Breduce

Capply

Dmap

Attempts:

3 left

💡 Hint

Common Mistakes

Using applymap, which applies element-wise, not column-wise.

Using map, which is not a DataFrame method.

The apply method on a DataFrame applies a function to each column by default.

3fill in blank

hard

Fix the error in applying a function to each column to get the max value.

Pandas

max_values = df.[1](max)

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Afilter

Bapply

Cmap

Dapplymap

Attempts:

3 left

💡 Hint

Common Mistakes

Using applymap which causes an error here.

Using map which is not a DataFrame method.

To get max values per column, use apply with max function.

4fill in blank

hard

Fill both blanks to create a dictionary of word lengths for words longer than 3 characters.

Pandas

lengths = {word: [1] for word in words if len(word) [2] 3}

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Alen(word)

B>

C<

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the word itself as value instead of its length.

Using less than instead of greater than in the condition.

The dictionary comprehension uses len(word) as value and filters words with length greater than 3.

5fill in blank

hard

Fill all three blanks to create a dictionary of uppercase words and their lengths for words longer than 4 characters.

Pandas

result = {{ [1]: [2] for word in words if len(word) [3] 4 }}

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Aword.upper()

Blen(word)

C>

Dword

Attempts:

3 left

💡 Hint

Common Mistakes

Using the original word as key instead of uppercase.

Using less than or equal instead of greater than.

The dictionary comprehension keys are uppercase words, values are lengths, filtered by length greater than 4.