Why do I get AttributeError: 'NoneType' object has no attribute 'something'?

Question

I keep getting an error that says

AttributeError: \'NoneType\' object has no attribute \'something\'

Answer 1

if we assign something like the below, it will throw error as "AttributeError: 'NoneType' object has no attribute 'show'"

df1=df.withColumn('newAge',df['Age']).show()