时间处理
pandas._libs.tslibs.timestamps.Timestamp转datetime
from pandas._libs.tslibs.timestamps import Timestamp
ts = Timestamp("2021-11-11 10:11:34", freq='MS')
print(type(ts))
date_time = ts.to_pydatetime()
print(type(date_time))
<class 'pandas._libs.tslibs.timestamps.Timestamp'>
<class 'datetime.datetime'>
两行之间相减
df = pd.DataFrame({"old": [10, 30, 20, 50, 40, 40]})
df['up-down'] = df['old'].diff(-1)
df['down-up'] = df['old'].diff(1)
print(df)
old up-down down-up
0 10 -20.0 NaN
1 30 10.0 20.0
2 20 -30.0 -10.0
3 50 10.0 30.0
4 40 0.0 -10.0
5 40 NaN 0.0
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