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how to replace a row value in pyspark dataframe

from pyspark.sql.functions import col, when

valueWhenTrue = None  # for example

df.withColumn(
    "existingColumnToUpdate",
    when(
        col("userid") == 22650984,
        valueWhenTrue
    ).otherwise(col("existingColumnToUpdate"))
)

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how to replace a row value in pyspark dataframe

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