根据范围将日期时间分类为新列
I have a dataset called df that looks like this:
| provider | fid | pid | datetime |
|---|---|---|---|
| CHE-223 | 2bfc9a62 | 2f43d557 | 2021-09-26T23:18:00 |
| CHE-223 | fff669e9 | 295b82e2 | 2021-08-13T09:10:00 |
我想创建一个名为wave的新表，该表具有从dateTime的日期范围的分类值。例如，从2019年11月16日到2020年2月28日的日期，它在Covid之前就具有价值。
我使用了循环函数来实现此目的，这是我使用的代码：
def wave(row):
if (row["datetime"] <= pd.Timestamp("2019-11-16")) & (row["datetime"] >= pd.Timestamp("2020-02-28")):
wave="before covid"
elif (row["datetime"] <= pd.Timestamp("2020-03-01")) & (row["datetime"] >= pd.Timestamp("2020-06-15")):
wave="1st wave"
elif (row["datetime"] <= pd.Timestamp("2020-06-16")) & (row["datetime"] >= pd.Timestamp("2020-09-30")):
wave="between waves"
elif (row["datetime"] <= pd.Timestamp("2020-10-01")) & (row["datetime"] >= pd.Timestamp("2021-01-15")):
wave="2nd wave"
df["wave"]=df.apply(lambda row:wave(row),axis=1)
但是它给了我列命名wave> wave ，但没有值。如何解决此问题并分类日期？
I have a dataset called df that looks like this:
| provider | fid | pid | datetime |
|---|---|---|---|
| CHE-223 | 2bfc9a62 | 2f43d557 | 2021-09-26T23:18:00 |
| CHE-223 | fff669e9 | 295b82e2 | 2021-08-13T09:10:00 |
I wanted to create a new table called wave that has categorical values for a range of date from datetime. e.g. For the date from 16th of November 2019 until 28th of February 2020, it gives a value before covid and so on.
I used a loop function to achieve this and this is the code I used:
def wave(row):
if (row["datetime"] <= pd.Timestamp("2019-11-16")) & (row["datetime"] >= pd.Timestamp("2020-02-28")):
wave="before covid"
elif (row["datetime"] <= pd.Timestamp("2020-03-01")) & (row["datetime"] >= pd.Timestamp("2020-06-15")):
wave="1st wave"
elif (row["datetime"] <= pd.Timestamp("2020-06-16")) & (row["datetime"] >= pd.Timestamp("2020-09-30")):
wave="between waves"
elif (row["datetime"] <= pd.Timestamp("2020-10-01")) & (row["datetime"] >= pd.Timestamp("2021-01-15")):
wave="2nd wave"
df["wave"]=df.apply(lambda row:wave(row),axis=1)
But it gives me a column named wave but with no values. How do I fix this and categorise the date?
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您的功能需要返回某些东西。此外，您的日期比较也被倒置：
在2019年11月16日之前和 2020年2月28日之后的匹配日期发生。
您的功能应该看起来像：
编辑：
＆amp;是一个角度操作员。对于逻辑表达式，请使用和。Your function needs to return something. Also your dates comparisons are inverted:
would match dates that are before the 16th of November 2019 and at the same time after the 28th of February 2020... which of course never happens.
Your function should look like:
Edit: also
&is a bit-wise operator. For logical expressions useand.