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Update looping-data-sets.md #142

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1 change: 1 addition & 0 deletions episodes/looping-data-sets.md
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Expand Up @@ -23,6 +23,7 @@ exercises: 10
If you recall from episode 06, the `pd.read_csv()` method takes a text string referencing a filename as an argument. If we have a list of strings that point to our filenames, we can loop through the list to read in each CSV file as a DataFrame. Let's print out the maximum values from the 'ytd' (year to date) column for each DataFrame.

```python
import pandas as pd
for filename in ['data/2011_circ.csv', 'data/2012_circ.csv']:
data = pd.read_csv(filename)
print(filename, data['ytd'].max())
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