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[英]Pandas/Python: How can I filter a Dataframe or Series by using functions?
[英]Python: How to filter a Pandas DataFrame using Values from a Series?
語境
我目前正在處理一些數據並遇到了問題。 我想使用系列中的值過濾 Pandas DataFrame。 但是,這總是會引發以下錯誤:
ValueError:Series 的真值不明確。 使用 a.empty、a.bool()、a.item()、a.any() 或 a.all()。
代碼
# DataFrame
userID (Int) | startTS (Int) | endTS (Int) | placeID (String)
# Group Data into Subgroups, one for each User.
stayGroup = stayData.groupby('userID')
for userID, data in stayGroup:
for index, row in data.iterrows():
# Stays starting during this Stay.
staysA = data[row['startTS'] < data['startTS'] < row['endTS']]
# Stays ending during this Stay.
staysB = data[row['startTS'] < data['endTS'] < row['endTS']]
# Stays starting before and ending after this Stay.
staysC = data[(row['startTS'] >= data['startTS']) & (row['endTS'] <= data['endTS'])]
問題
有誰知道這個錯誤是什么意思以及我該如何解決? 非常感謝您提前提供的幫助!
問題是row['startTS'] < data['startTS'] < row['endTS']
,你可以使用
data['startTS'].between(row['startTS'], row['endTS'], inclusive='neither')
# or
(row['startTS'] < data['startTS']) & (df['startTS'] < row['endTS'])
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