"""
Ex. 6.9 from 'A primer on...', but implemented
using a class instead of dictionaries. We define
a class which holds the necessary information for
one human species (one line in the file), and the
total information is stored as a list of instances of this class.

The class contains a special method __str__ which writes
the information in the same format as the original file.
"""


class Human:
    def __init__(self, name, when, height, mass, brain):
        self.name = name
        self.when = when
        self.height = height
        self.mass = mass
        self.brain = brain

    def __str__(self):
        species = self.name
        w = self.when
        h = self.height
        m = self.mass
        b = self.brain
        line = f'{species:20s} {w:14s} {h:10s} {m:9s} {b}'
        return line

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()
            H = Human(species, when, height, mass, brain)
            humans.append(H)



for h in humans:
    print(h)    #this only works since we have defined the special method __str__ in the class



"""
Terminal> python humans_class.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
"""