"""Ex. 6.9 from 'A primer on...
Read info from a file into a nested dictionary.
File is structured in a way that makes it difficult
to process each line with the split-function. We can instead
use string indexing.
Finally, print the info from the diction
"""

#read file and store in a nested dict:
humans = {}
with open('human_evolution.txt') as infile:
    for line in infile:
        if line[0] == 'H':
            species = line[:20].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 volume': brain}
            humans[species] = info




"""Print info from dict to the screen, in nicely formatted columns.
Notice the format specifiers to ensure correct alignment of the columns."""
for key, value in humans.items():
    species = key
    w = value['when']
    h = value['height']
    m = value['mass']
    b = value['brain volume']
    line = f'{key: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
"""