创建具有任意数量的子句的PySpark .when()语句

pyspark.sql.functions.when(condition, value)

from pyspark.sql import SparkSession
from pyspark.sql.functions import when

# 创建SparkSession
spark = SparkSession.builder.getOrCreate()

# 创建示例数据
data = [("Alice", 25), ("Bob", 30), ("Charlie", 35)]
df = spark.createDataFrame(data, ["name", "age"])

# 使用.when()语句创建一个新列"category"，根据年龄进行分类
df = df.withColumn("category", when(df.age < 30, "Young").when(df.age < 40, "Middle-aged").otherwise("Old"))

# 显示结果
df.show()

+-------+---+------------+
|   name|age|    category|
+-------+---+------------+
|  Alice| 25|       Young|
|    Bob| 30|Middle-aged|
|Charlie| 35|Middle-aged|
+-------+---+------------+