"""
Read data into nested dict humans[name],
with the following keys for each species:
height, weight, brain volume, when

Note: Using split() for processing each line does
not work because of multiple arbitrary spaces.
A better procedure for this particular file is
to use string indexing/slicing to extract each data field.
"""


filename = 'human_evolution.txt'

humans = {}

with open(filename) as infile:
    for line in infile:
        if line[0] == 'H':
            name = line[:20].strip()
            when = line[20:35].strip()
            height = line[35:50].strip()
            weight = line[50:60].strip()
            brain = line[60:].strip()
            humans[name] = {'when':when,'height':height,'weight':weight,'brain volume':brain}


#loop through the dictionary to print the result:
for name in humans:
    h = humans[name] #local variable to reduce typing on next line
    #Use an f-string with fixed-length data fields:
    line = f"{name:20} {h['when']:15} {h['height']:10} {h['weight']:10} {h['brain volume']:15}"
    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
"""