iloc for position-based selection in Pandas - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to select the first row of the DataFrame using iloc.

Pandas

first_row = df.iloc[[1]]

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

A0

B-1

C2

D1

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1 instead of 0 to select the first row.

Using negative indices incorrectly.

The first row in pandas DataFrame is at position 0, so df.iloc[0] selects it.

2fill in blank

medium

Complete the code to select the first three rows of the DataFrame using iloc.

Pandas

subset = df.iloc[[1]]

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

A0,3

B1:4

C0:3

D[0,1,2]

Attempts:

3 left

💡 Hint

Common Mistakes

Using 1:4 which skips the first row.

Using a tuple or list instead of a slice.

Using slice 0:3 with iloc selects rows at positions 0, 1, and 2 (first three rows).

3fill in blank

hard

Fix the error in the code to select the last two rows using iloc.

Pandas

last_two = df.iloc[[1]]

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A-2:

B[-2:]

Cdf[-2:]

Dlen(df)-2:len(df)

Attempts:

3 left

💡 Hint

Common Mistakes

Using brackets around the slice which causes a TypeError.

Using df[-2:] which is label-based slicing, not iloc.

Using iloc with slice -2: selects the last two rows by position. Brackets or df slicing won't work with iloc.

4fill in blank

hard

Fill both blanks to select rows 1 to 3 and columns 0 to 2 using iloc.

Pandas

subset = df.iloc[[1], [2]]

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

A1:4

B0:3

C[1,2,3]

D[0,1,2]

Attempts:

3 left

💡 Hint

Common Mistakes

Using lists instead of slices for iloc.

Off-by-one errors in slice ranges.

Rows 1 to 3 are selected with slice 1:4 (stop exclusive). Columns 0 to 2 are selected with 0:3.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each word to its length only if length is greater than 3.

Pandas

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

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

Aword

Blen(word)

Ditem

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names inconsistently.

Using the length as the key instead of the value.

The comprehension maps each word to its length. 'word' is the variable, 'len(word)' is the value, and 'word' is used in the loop.