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joelgrus / data-science-from-scratch

code for Data Science From Scratch book
MIT License
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code to sort people from the most friends to the least friends is missing in introduction.py #6

Open iphyer opened 9 years ago

iphyer commented 9 years ago

code to sort people from the most friends to the least friends is missing in introduction.py .

iphyer commented 9 years ago

Oops！ I think there must be something you mistake when you write the final draft into the PDF for publishing. The code in PDF book Page 3 shows that id is form 0 to 9. But in code result shown in Page 5 is 1 to 10. I believe you want to user 0 to 9 for code in page 7 clearly shows that. interests list is form 0 to 9.

iphyer commented 9 years ago

I have coded these codes following your book

 num_friends_by_id = [(user["id"],number_of_friends(user)) 
                 for user in users]

 sorted(num_friends_by_id,
   key=lambda (users_id , num_friends): num_friends,
   reverse=True)