Sha*_*ouz 1 random dataframe pyspark
我正在使用 Pyspark DataFrame。
我想用 14 到 46 范围内的随机值更新Age列中的NA 值。
我该怎么做?
小智 5
如果您想用相同的随机数替换空值,Mara 的答案是正确的,但如果您想要每个年龄的随机值,您应该执行合并和 F.rand() 操作,如下所示:
from pyspark.sql import functions as F
from pyspark.sql.types import IntegerType
from random import randint
df = sqlContext.createDataFrame(
[(1, "a", 23.0), (3, "B", -23.0)], ("x1", "x2", "x3"))
df = (df
.withColumn("x4", F.lit(None).cast(IntegerType()))
.withColumn("x5", F.lit(None).cast(IntegerType()))
)
df.na.fill({'x4':randint(0,100)}).show()
df.withColumn('x5', F.coalesce(F.col('x5'), (F.round(F.rand()*100)))).show()
+---+---+-----+---+----+
| x1| x2| x3| x4| x5|
+---+---+-----+---+----+
| 1| a| 23.0| 9|null|
| 3| B|-23.0| 9|null|
+---+---+-----+---+----+
+---+---+-----+----+----+
| x1| x2| x3| x4| x5|
+---+---+-----+----+----+
| 1| a| 23.0|null|44.0|
| 3| B|-23.0|null| 2.0|
+---+---+-----+----+----+
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