"""
Exercise 6.7 from "A primer on...". 
Read data from file and store in a 
nested dictionary. 
"""



humans = {}

with open('human_evolution.txt') as infile:
    for line in infile:
        if line[0] == 'H':
            name = line[:21].strip()
            when = line[21:36].strip()
            height = line[36:49].strip()
            mass = line[49:60].strip()
            brain = line[60:].strip()
            
            details = {'when':when, 'height':height, 'mass':mass, 'brain volume': brain}
            humans[name] = details


#iterate the dictionary and print a nicely formatted table:
for spec, human in humans.items():  #items() returns a list of (key, value) tuples
    print(f"{spec:20} {human['when']:14} {human['height']:12} {human['mass']:12} {human['brain volume']}")


"""
Terminal> python humans.py
H. habilis           2.2 - 1.6      1.0 - 1.5    33 - 55      660
H. erectus           1.4 - 0.2      1.8          60           850 (early) - 1100 (late)
H. ergaster          1.9 - 1.4      1.9                       700 - 850
H. heidelbergensis   0.6 - 0.35     1.8          60           1100 - 1400
H. neanderthalensis  0.35 - 0.03    1.6          55 - 70      1200 - 1700
H. sapiens sapiens   0.2 - present  1.4 - 1.9    50 - 100     1000 - 1850
H. floresiensis      0.10 - 0.012   1.0          25           400
"""