fp_exercise2.py

people = [{'name': 'Mary', 'height': 160},
          {'name': 'Isla', 'height': 80},
          {'name': 'Sam'}]
 
"""
height_total = 0
height_count = 0
for person in people:
    if 'height' in person:
        height_total += person['height']
        height_count += 1

if height_count > 0:
    average_height = height_total / height_count # => 120
"""
 
# Rewrite the code above using map, reduce and filter
 
# Expected answer: 120