日期时间索引yyyy-mm-dd h:m:s.t到yyyy-mm-dd h:m:s

我尝试了以下代码:

Input: 
v16wk19_1["Datum"] = pd.to_datetime(v16wk19_1["Datum"], dayfirst=True)
v16wk19_1 = v16wk19_1.set_index(v16wk19_1["Datum"])
v16wk19_1 = v16wk19_1.sort_index()
v16wk19_1 = v16wk19_1.drop(["Datum"], axis=1)
v16wk19_1.info()

Output:
<class 'pandas.core.frame.DataFrame'>
DatetimeIndex: 80 entries, 2020-05-07 11:56:40 to 2020-05-07 12:09:50.001000
Data columns (total 5 columns):
 #   Column        Non-Null Count  Dtype  
---  ------        --------------  -----  
 0   tijd, 10 sec  80 non-null     int64  
 1   Temp cir.     80 non-null     float64
 2   Temp o.k.     80 non-null     float64
 3   Druk          80 non-null     float64
 4   Flow          80 non-null     float64
dtypes: float64(4), int64(1)
memory usage: 3.8 KB

DatetimeIndex为: DatetimeIndex:80个条目,2020-05-07 11:56:40至2020-05-07 12:09:50 .001000

但是.001000必须从日期时间中删除

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