"""
Ex 6.7 from "A primer on..." Read structured file data into a 
nested dictionary, then write the data in a tabular
format similar to the file. 
"""


humans = {}

with open('human_evolution.txt') as infile:
    for line in infile:
        if line[0] == 'H':
            species = line[:21].strip()
            when = line[21:37].strip()
            height = line[37:50].strip()
            mass = line[50:62].strip()
            brain = line[62:].strip()
            info = {'when': when, 'height': height, 'mass': mass, 'brain': brain}
            humans[species] = info

#print(humans)

for species, info in humans.items():
    w = info['when']
    h = info['height']
    m = info['mass']
    b = info['brain']
    #use an f-string and format specifiers to get nice columns
    line = f'{species:20s} {w:14s} {h:10s} {m:9s} {b}'
    print(line)


"""
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
"""