# You could probably use another import here:
from pprint import pprint


# Person class goes here:


peeps = [Person('Stan', '2008-08-13', 150, 45),
         Person('Kyle', '2008-02-25', 160, 50),
         Person('Cartman', '2008-05-26', 140, 100),
         Person('Kenny', '2009-07-30', 130, 40)]

# Fill in the appropriate expressions in place of the Nones

avg_height = None
print("avg_height: {}cm".format(avg_height))

avg_weight = None
print("avg_wieght: {}kg".format(avg_weight))

name2heights = None
print("name2heights:")
pprint(name2heights)

name2weights = None
print("name2weights:")
pprint(name2weights)

peeps_by_age = None
pprint(peeps_by_age)