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57 lines
1.5 KiB
57 lines
1.5 KiB
import string
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# list with all valid characters
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CHARACTERS = list(string.ascii_letters) + [" ", ",", "'", "?", "Ä", "ö"]
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def letter_frequency(sentence):
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# init a list of tuples for all valid characters
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frequencies = [(c, 0) for c in CHARACTERS]
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for letter in sentence:
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# find index of selected character
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index = CHARACTERS.index(letter)
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# increment counter of selected character
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frequencies[index] = (letter, frequencies[index][1] + 1)
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return frequencies
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print(letter_frequency("Hello world, what's going on? Äötsch"))
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# sorting self constructed classes by overriding their __lt__ method
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class WeirdSortee:
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def __init__(self, string, number, sort_num):
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self.string = string
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self.number = number
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self.sort_num = sort_num
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def __lt__(self, object):
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if self.sort_num:
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return self.number < object.number
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return self.string < object.string
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def __repr__(self):
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return "{}:{}".format(self.string, self.number)
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a = WeirdSortee('a', 4, True)
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b = WeirdSortee('b', 3, True)
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c = WeirdSortee('c', 2, True)
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d = WeirdSortee('d', 1, True)
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l = [a, d, c, b]
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print(str(l) + " unsorted")
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l.sort()
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print(str(l) + " sorted by number")
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for i in l:
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i.sort_num = False
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l.sort()
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print(str(l) + " sorted by character")
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# using the 'key' argument of the sort() method
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x = [(1, 'c'), (2, 'a'), (3, 'b')]
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x.sort()
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print(str(x) + " sorted by 1st item")
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x.sort(key=lambda i: i[1])
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print(str(x) + " sorted by 2nd item")
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