fix typo in ex2_2.md

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Peili Liang 2023-09-11 10:17:26 +08:00 committed by GitHub
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@ -152,7 +152,7 @@ The key feature that makes this work is that a defaultdict
automatically initializes elements for you--allowing an insertion of a
new element and an `append()` operation to be combined together.
## (c) Data Analysis Challenge
## (d) Data Analysis Challenge
In the last exercise you just wrote some code to read CSV-data related
to the Chicago Transit Authority. For example, you can grab the data