change a lazy `map` into a list comprehension
change a lazy `map` into a list comprehension
clan2000/data-science-from-scratch,fgiunta/data-science-from-scratch,reshama/data-science-from-scratch,Insight-book/data-science-from-scratch,rnder/data-science-from-scratch,joelgrus/data-science-from-scratch,alialerwi/LearningRepository,RichHelle/data-science-from-scratch