Practice: Check your understanding

Make sure you read all instructions on this page .

The following questions are here to help you test your understanding of the past reading so far!

Question 0

Suppose I had this small dataset (shown below) in a variable called df. We want to only filter df so that we have all the data but the rows where 'C' is NaN.

Which of the following methods successfully filters this dataset as described?

A	B	C
1	2	NaN
3	NaN	4
5	6	NaN
NaN	7	8
9	10	11

Your Task

Select one option. Write your answer down in your own space.

Option 0

df[df['C'] == np.nan]

Option 1

df.dropna()

Option 2

df[df['C'].notnull()]

Option 3

df[df['C'].notna()]

Option 4

df['C'].dropna()