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#!/usr/bin/env python3
import unittest
from typing import List
def is_single_row_word(word: str) -> bool:
"""Check if a word can be typed using only one row of the keyboard.
Args:
word (str): The word to check.
Returns:
bool: True if the word can be typed using only one row of the keyboard,
False otherwise.
"""
keyboard_rows = ['qwertyuiop', 'asdfghjkl', 'zxcvbnm']
keyboard_map = {}
for i in range(len(keyboard_rows)):
for c in keyboard_rows[i]:
keyboard_map[c] = i+1
row = keyboard_map.get(word[0].lower(), 0)
for c in word:
if keyboard_map.get(c.lower(), 0) != row:
return False
return True
def filter_single_row_words(words: List[str]) -> List[str]:
"""Filter out the words that can be typed using only one row of the keyboard.
Args:
words (List[str]): The list of words to filter.
Returns:
List[str]: A new list containing only the words that can be typed using
only one row of the keyboard.
"""
return [w for w in words if is_single_row_word(w)]
class TestSingleRowWords(unittest.TestCase):
def test_example1(self):
"""Test the first example from the task description."""
words = ["Hello", "Alaska", "Dad", "Peace"]
single_row_words = filter_single_row_words(words)
self.assertCountEqual(single_row_words, ["Alaska", "Dad"])
def test_example2(self):
"""Test the second example from the task description."""
words = ["OMG", "Bye"]
single_row_words = filter_single_row_words(words)
self.assertCountEqual(single_row_words, [])
if __name__ == '__main__':
unittest.main()
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