Question: Using PySpark to do some of the data wrangling process, so that: 1 . 1 . 1 For the NA in CustomerNo columns, change it

Using PySpark to do some of the data wrangling process, so that:
1.1.1 For the NA in CustomerNo columns, change it to -1.
1.1.2 Process the text in productName column, only alphabet characters left, and save the processed result to a new column productName_process and show the first 5 rows.

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