會以樹狀格式列印結構。 若結構是巢狀，則可選擇指定列印的層數。
語法
printSchema(level: Optional[int] = None)
參數
| 參數 | 類型 | 說明 |
|---|---|---|
level |
int，可選 | 巢狀結構要列印多少層。 |
Examples
df = spark.createDataFrame(
[(14, "Tom"), (23, "Alice"), (16, "Bob")], ["age", "name"])
df.printSchema()
# root
# |-- age: long (nullable = true)
# |-- name: string (nullable = true)
df = spark.createDataFrame([(1, (2, 2))], ["a", "b"])
df.printSchema(1)
# root
# |-- a: long (nullable = true)
# |-- b: struct (nullable = true)
df.printSchema(2)
# root
# |-- a: long (nullable = true)
# |-- b: struct (nullable = true)
# | |-- _1: long (nullable = true)
# | |-- _2: long (nullable = true)