Cache and Persist DataFrame PySpark Interview Question | Maersk Interview Question |

data = [("Raj","Doe",None),
(None,"Samuel","VIZAG"),
("David","Smith", None),
("Samson",None, "HYD"),
("Immi", "Steve", "BNG"),
(None, None, None)]
columns = ["Firstname", "Lastname", "City"]
df = spark.createDataFrame(data,columns)
df.cache()
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