回答編集履歴
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追記
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inplace = True が余分ですので削除してください。
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inplace = True が余分ですので削除してください。
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---
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【追記】私の環境では下記コードで動作しております。
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```Python
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import pandas as pd
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df1 = pd.DataFrame({'release_speed':[50, 100, 120], 'pitch_type':['straight', 'curv', 'folk'], 'game_date':['2020/1/15', '2020/3/1', '2020/5/23', ], 'player_name':['Mark', 'Karl', 'Bob']})
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def preparation(df_local) :
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df_local['球速(km/h)'] = df_local['release_speed'] * 1.60934
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df_local = df_local.rename(columns = {
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'pitch_type' : '球種' ,
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'game_date' : '試合日' ,
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'player_name' : '選手名' ,
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})
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df_local = df_local.loc[ : , ['球種', '試合日', '選手名', '球速(km/h)']]
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print(df_local)
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# 球種 試合日 選手名 球速(km/h)
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#0 straight 2020/1/15 Mark 80.4670
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#1 curv 2020/3/1 Karl 160.9340
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#2 folk 2020/5/23 Bob 193.1208
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print(df1)
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# game_date pitch_type player_name release_speed
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#0 2020/1/15 straight Mark 50
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#1 2020/3/1 curv Karl 100
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#2 2020/5/23 folk Bob 120
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preparation(df1)
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```
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