fix: pandas mean defaults

README.md

@@ -21,6 +21,11 @@ If I were using Windows, it might look like this:
 Set these aside for now and we'll pick them up in chapter 2.
 
 ## Changelog
+### v0.9.10 (2024-04-22)
+Fix Pandas `mean` example. More: Pandas changed their defaults to throw an
+error if you try to call this on string columns. Fixed example to explicitely
+only call it on numeric data.
+
 ### v0.9.8 (2024-02-09)
 Fixed answers for exercise 2.1 (thanks for the pull request Nic!).
 

code/03_02_functions.py

@@ -5,11 +5,11 @@
 # stored
 # on Windows it might be something like 'C:/mydir'
 
-DATA_DIR = '/Users/nathan/baseball-book/data'
+DATA_DIR = './data'
 
 atbats = pd.read_csv(path.join(DATA_DIR, '2018-season', 'atbats.csv'))
 
-atbats.mean()
+atbats[['G', 'AB', 'R', 'H', '2B', '3B', 'HR', 'RBI']].mean()
 atbats.max()
 
 # Axis