python - 断言错误 : col should be Column

Question

如何在 PySpark 中创建一个新列并用今天的日期填充此列？

这是我尝试过的:

import datetime
now = datetime.datetime.now()
df = df.withColumn("date", str(now)[:10])

我收到这个错误:

AssertionError: col should be Column

Answer 1

How to create a new column in PySpark and fill this column with the date of today?

已经有这个功能了:

from pyspark.sql.functions import current_date

df.withColumn("date", current_date().cast("string"))

AssertionError: col should be Column

使用文字

from pyspark.sql.functions import lit

df.withColumn("date", lit(str(now)[:10]))