Checking for duplicate keys
The team is debating whether or not two datasets can be joined. The question comes down to whether or not each data frame has a unique set of one or more key columns.
You'll be going back to two data frames from before, game_matchups and punts. In an earlier exercise you determined there was a one-to-many relationship between the data frames.
Deze oefening maakt deel uit van de cursus
Pandas Joins for Spreadsheet Users
Praktische interactieve oefening
Probeer deze oefening eens door deze voorbeeldcode in te vullen.
# View first 5 rows of game_matchups and check key columns
print(____.head())
____('Duplicate keys:', game_matchups.____('GameKey').sum())