擅长:python、mysql、java
<p>“Filter”在数据帧的末尾生成空列表。而且,由于数据是按时间顺序排列的,所以获得比基本时间戳更大的时间戳是一种奢侈。你知道吗</p>
<pre><code>import numpy as np, pandas as pd, datetime as dt
df=pd.read_csv("stack.csv",parse_dates=[1],index_col=0)
l=[]
for i in df.index:
l.append(None)
start=df.at[i,"exchTstamp"]
for k in range(i+1,len(df.index)):
if start<=df.at[k,"exchTstamp"]-dt.timedelta(seconds=0.01):
l[-1]=df.at[k,"exchTstamp"]
break
df["testTime"]= l
</code></pre>