pyspark获取周数 [英] pyspark getting weeknumber of month
本文介绍了pyspark获取周数的处理方法,对大家解决问题具有一定的参考价值,需要的朋友们下面随着小编来一起学习吧!
问题描述
我对从datafrme列的pyspark中的月份中获取周数感到困惑,例如,将我的数据框视为
I am stuckup with getting weeknumber from month in pyspark from a datafrme column , For Examples consider my dataframe as
WeekID,DateField,WeekNUM
1,01/JAN/2017
2,15/Feb/2017
我的输出应如下所示
WeekIDm,DateField,MOF
1,01/JAN/2017,1
2,15/FEB/2017,2
我尝试了striftime和其他无法执行的日期函数.
I tried with striftime and other date functions I was unable to do.
请帮助我解决问题.
推荐答案
您可以组合 to_date
和 date_format
:
from pyspark.sql.functions import to_date, date_format
df = spark.createDataFrame(
[(1, "01/JAN/2017"), (2, "15/FEB/2017")], ("id", "date"))
df.withColumn("week", date_format(to_date("date", "dd/MMM/yyyy"), "W")).show()
+---+-----------+----+
| id| date|week|
+---+-----------+----+
| 1|01/JAN/2017| 1|
| 2|15/FEB/2017| 3|
+---+-----------+----+
如果您希望按年输入星期,请用 w
替换格式:
If you want week-of-year please replace format with w
:
date_format(to_date("date", "dd/MMM/yyyy"), "w")
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