无法合并日期列上的数据
无法合并日期列上的数据
提问于 2022-08-15 21:24:06
我有两个数据文件，如下所示：
左：
date B N S yesterday_B yesterday_N yesterday_S
0 2021-01-03 4 99 0 3.0 80.0 0.0
1 2021-01-04 3 78 0 4.0 99.0 0.0
2 2021-01-05 0 50 0 3.0 78.0 0.0
3 2021-01-06 2 50 0 0.0 50.0 0.0
4 2021-01-07 2 10 0 2.0 50.0 0.0右：
finish yesterday change day_t-2 date
0 11900 12230 -1 12850.0 2021-01-03
1 12150 11900 1 12230.0 2021-01-04
2 11640 12150 -1 11900.0 2021-01-05
3 11100 11640 -1 12150.0 2021-01-06
4 10620 11100 -1 11640.0 2021-01-09我想加入这两个“日期”专栏的代码：
df = pd.merge(left, right, on='date', how='left')但不幸的是，我得到了这样的结果：
index date
B N S yesterday_B yesterday_N yesterday_S finish_price yesterday_price price_change price_day_t-2
0 0 2021-01-03 1 2021-01-04 2 2021-01-05 3 2021-01-06 4 2021-01-07 ... 502 2022-06-06 503 2022-06-07 504 2022-06-08 505 2022-06-09 506 2022-06-10 Name: date, Length: 507, dtype: datetime64[ns] 4 99 0 3.0 80.0 0.0 NaN NaN NaN NaN
1 0 2021-01-03 1 2021-01-04 2 2021-01-05 3 2021-01-06 4 2021-01-07 ... 502 2022-06-06 503 2022-06-07 504 2022-06-08 505 2022-06-09 506 2022-06-10 Name: date, Length: 507, dtype: datetime64[ns] 3 78 0 4.0 99.0 0.0 NaN NaN NaN NaN
2 0 2021-01-03 1 2021-01-04 2 2021-01-05 3 2021-01-06 4 2021-01-07 ... 502 2022-06-06 503 2022-06-07 504 2022-06-08 505 2022-06-09 506 2022-06-10 Name: date, Length: 507, dtype: datetime64[ns] 0 50 0 3.0 78.0 0.0 NaN NaN NaN NaN
3 0 2021-01-03 1 2021-01-04 2 2021-01-05 3 2021-01-06 4 2021-01-07 ... 502 2022-06-06 503 2022-06-07 504 2022-06-08 505 2022-06-09 506 2022-06-10 Name: date, Length: 507, dtype: datetime64[ns] 2 50 0 0.0 50.0 0.0 NaN NaN NaN NaN
4 0 2021-01-03 1 2021-01-04 2 2021-01-05 3 2021-01-06 4 2021-01-07 ... 502 2022-06-06 503 2022-06-07 504 2022-06-08 505 2022-06-09 506 2022-06-10 Name: date, Length: 507, dtype: datetime64[ns] 2 10 0 2.0 50.0 0.0 NaN NaN NaN NaN为什么它不能区分日期？解决办法是什么？我已将日期时间转换为字符串beofre。
Stack Overflow用户
发布于 2022-08-15 21:45:37
请考虑以正确的格式解析它们。您确定没有更多的列或其他内容吗？
left['date'] = pd.to_datetime(left['date'],infer_datetime_format=True)
right['date'] = pd.to_datetime(right['date'],infer_datetime_format=True)然后试着：
output = left.merge(right,on='date',how='left')页面原文内容由Stack Overflow提供。腾讯云小微IT领域专用引擎提供翻译支持
原文链接：
https://stackoverflow.com/questions/73366568
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