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Challenge 1: Vowel Balance

curriculum/challenges/english/blocks/daily-coding-challenges-python/6814d8e1516e86b171929de4.md

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--description--

Given a string, determine whether the number of vowels in the first half of the string is equal to the number of vowels in the second half.

  • The string can contain any characters.
  • The letters a, e, i, o, and u, in either uppercase or lowercase, are considered vowels.
  • If there's an odd number of characters in the string, ignore the center character.

--hints--

is_balanced("racecar") should return True.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced("racecar"), True)`)
}})

is_balanced("Lorem Ipsum") should return True.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced("Lorem Ipsum"), True)`)
}})

is_balanced("Kitty Ipsum") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced("Kitty Ipsum"), False)`)
}})

is_balanced("string") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced("string"), False)`)
}})

is_balanced(" ") should return True.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced(" "), True)`)
}})

is_balanced("abcdefghijklmnopqrstuvwxyz") should return False.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced("abcdefghijklmnopqrstuvwxyz"), False)`)
}})

is_balanced("123A#b!E&*456-o.U") should return True.

js
({test: () => { runPython(`
from unittest import TestCase
TestCase().assertIs(is_balanced("123A#b!E&*456-o.U"), True)`)
}})

--seed--

--seed-contents--

py
def is_balanced(s):

    return s

--solutions--

py
def is_balanced(s):
    vowels = set("aeiouAEIOU")
    n = len(s)
    half = n // 2

    first_half = s[:half]
    second_half = s[-half:]

    def count_vowels(sub):
        return sum(1 for char in sub if char in vowels)

    return count_vowels(first_half) == count_vowels(second_half)