Week #4 Fixes

source/week-4/csv-files-jupyter/README.md

@@ -1,6 +1,27 @@
 # CSV Files and Jupyter Notebooks
 
-CSV files are comma separated variable file. CSV files are frequently used to store data. In order to access the data in a CSV file from a Jupyter Notebook you must upload the file. 
+The so-called **CSV** (Comma Separated Values) format is the most common import and export format for spreadsheets and databases. The CSV format was used for many years prior to attempts to describe the format in a standardized way.
+
+Python has an in-built csv module which implements classes to read and write tabular data in CSV format.
+
+```python
+# format example
+>>> import csv
+>>> with open('./airports.csv') as file:
+...     data = csv.reader(file)
+...     for row in data:
+...     print(*row) # * is used to unpack lists
+Name City Country
+Seattle-Tacoma Seattle USA
+Dulles Washington USA
+Heathrow London United Kingdom
+Schiphol Amsterdam Netherlands
+Changi Singapore Singapore
+Pearson Toronto Canada
+Narita Tokyo Japan
+```
+
+A this module has a lot more features, checkout [more details](https://docs.python.org/3/library/csv.html).
 
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