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import re
import unittest
"""
Week 194:
https://theweeklychallenge.org/blog/perl-weekly-challenge-194
Task 2: Frequency Equalizer
Submitted by: Mohammad S Anwar
You are given a string made of alphabetic characters only, a-z.
Write a script to determine whether removing only one character can make the frequency of the remaining characters the same.
"""
class FrequencyEqualizer:
@staticmethod
def frequency_equalizer(string: str) -> bool:
character_frequency_map = dict()
for character in string:
if character in character_frequency_map:
character_frequency_map[character] += 1
else:
character_frequency_map[character] = 1
unique_frequencies = list(set(character_frequency_map.values()))
return True if len(unique_frequencies) == 2 and abs(unique_frequencies[0] - unique_frequencies[1]) == 1 else False
class FrequencyEqualizerTestCases(unittest.TestCase):
def test_digital_clock(self):
self.assertTrue(FrequencyEqualizer.frequency_equalizer("abbc"), 'Test case 1 Failed.')
self.assertTrue(FrequencyEqualizer.frequency_equalizer("xyzyyxz"), 'Test case 2 Failed.')
self.assertFalse(FrequencyEqualizer.frequency_equalizer("xzxz"), 'Test case 3 Failed.')
if __name__ == '__main__':
unittest.main()
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