Python grouping program

[DeaD_EyE]

Your solution is here:
https://docs.python.org/3.6/library/func...tml#sorted
https://docs.python.org/3/library/iterto...ls.groupby

import itertools


def bycase(word):
    if word[0].isupper():
        return 'uppercase'
    else:
        return 'lowercase'

def byfirstletter(word):
    return word[0].lower()

words = ['foo', 'bar', 'Baz', 'baz', 'Bar']

# now sort bycase
words_sorted = sorted(words, key=bycase)
for key, group in itertools.groupby(words_sorted, bycase):
    print('Key:', key)
    for word in group:
        print('Word:', word)

# now sort byfirstletter
words_sorted = sorted(words, key=byfirstletter)
for key, group in itertools.groupby(words_sorted, byfirstletter):
    print('Key:', key)
    for word in group:
        print('Word:', word)

The more interesting part is, when you have a list like a table.
For example you have a table with cars and one row has the color.
Sorting by color example:

from itertools import groupby
from operator import itemgetter

#example data
##### col0,  col1, col2
cars = [('BMW', '318i', 'blue'),
     ('BMW', '323i', 'blue'),
     ('BMW', '318i', 'black'),
     ('BMW', '323i', 'blue'),
     ('BMW', '323i', 'black'),
     ('BMW', '320i', 'silver'),
     ('BMW', '318i', 'silver'),
     ('BMW', '318i', 'black'),
     ('BMW', '323i', 'silver'),
     ('BMW', '320i', 'silver'),
     ('BMW', '323i', 'black'),
     ('BMW', '318i', 'blue'),
     ('BMW', '323i', 'blue'),
     ('BMW', '323i', 'blue'),
     ('BMW', '323i', 'blue')]

sorted_cars = sorted(cars, key=itemgetter(2)) # sort by color
for color, group in groupby(sorted_cars, itemgetter(2)): # group by color
    print('Color:', color)
    for manufacturer, model, color in group:
        print(manufacturer, model, color)

Hope it helps. Next time you should post example data.

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Ok, you edited you original post, my answer is useless in this topic.