[英]Counting values in pandas dataframe of non-nan values with date comparison condition
我有以下數據框:
Date_1 Date_2 Date_3
2019-12-18 13:43:47 2019-12-18 13:43:47
2019-12-18 13:43:48 2019-12-18 13:43:47
2020-12-18 17:51:17
2020-12-18 17:51:17 2020-12-18 17:51:17 2020-12-18 17:51:17
如果滿足日期大於today
的條件,我正在嘗試計算每列中存在的值的數量。
我的代碼:
today=pd.Timestamp.today() - pd.Timedelta(days=1)
total_date_1_events = len([df['Date_1']>today])+1
total_date_2_events = len([df['Date_2']>today])+1
total_date_3_events = len([df['Date_3']>today])+1
如果我打印 3 個變量中的每一個,它們都輸出相同的結果,即 4,我理解這是因為空行也被計算在內。
我想得到以下結果:
total_date_1_events = 2 # because there are only 2 dates that are bigger than today
total_date_2_events = 1 # because there are only 1 date that is bigger than today
total_date_3_events = 1 # because there are only 1 date that is bigger than today
謝謝你的建議。
簡單地做:
sum(df.Date_1>pd.Timestamp.today())
sum(df.Date_1>pd.Timestamp.today())
sum(df.Date_1>pd.Timestamp.today())
熊貓方式Series.sum
和Series.gt
:
df['Date_1'].gt(today).sum()
如果您需要更多列,您可以這樣做:
s = df[['Date_1','Date_2','Date_3']].gt(today).sum()
這創建了一個系列。 您可以使用以下方法訪問值:
s['Date_1']
s['Date_2']
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