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Update 03-index-slice-subset.md #481

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2 changes: 1 addition & 1 deletion _episodes/03-index-slice-subset.md
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Expand Up @@ -526,7 +526,7 @@ surveys_df[pd.isnull(surveys_df).any(axis=1)]
{: .language-python}

Note that the `weight` column of our DataFrame contains many `null` or `NaN`
values. We will explore ways of dealing with this in Lesson 03.
values. We will explore ways of dealing with this in the next episode on [Data Types and Formats]({{ page.root }}{% _episodes/04-data-types-and-format.md %}).
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We can run `isnull` on a particular column too. What does the code below do?

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