add column in spark dataframe

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1from pyspark.sql.functions import lit
2
3df = sqlContext.createDataFrame(
4    [(1, "a", 23.0), (3, "B", -23.0)], ("x1", "x2", "x3"))
5
6df_with_x4 = df.withColumn("x4", lit(0))
7df_with_x4.show()
8
9## +---+---+-----+---+
10## | x1| x2|   x3| x4|
11## +---+---+-----+---+
12## |  1|  a| 23.0|  0|
13## |  3|  B|-23.0|  0|
14## +---+---+-----+---+

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