假设我们有两个数据帧(Baseball_ID和Baseball_Games),我们如何向Baseball_Games添加两列(Home_City和Away_City)并包含全部名称" City" (例如波士顿,马萨诸塞州)来自Baseball_ID的每支球队?
Baseball_ID:
Team_ID City
BOS Boston, MA
DET Detroit, MI
NYY New York, NY
PIT Pittsburgh, PA
Baseball_Games:
Home Away Home_City Away_City
NYY DET ?? ??
PIT BOS ?? ??
答案 0 :(得分:0)
我认为你正在寻找'合并'功能:
Baseball_Games = pd.merge(Baseball_Games, Baseball_id, how='inner', left_on='Home',
right_on='Team_ID').drop('Team_ID', axis=1).rename(columns={'City': 'Home_City'})
Baseball_Games = pd.merge(Baseball_Games, Baseball_id, how='inner', left_on='Away',
right_on='Team_ID').drop('Team_ID', axis=1).rename(columns={'City': 'Away_City'})
结果:
Home Away Home_City Away_City
0 NYY DET New York, NY Detroit, MI
1 PIT BOS Pittsburgh, PA Boston, MA
从您的问题中不确定任何列是否为索引。如果是,请使用'right_index'= True(或'left_index',无论您需要哪个数据框的索引),而不是'right_on'或'left_on'。
希望这有帮助