input: Write a function to filter out all the vowels from a given string. Return the filtered string with only consonants and non-vowel characters.
  def filter_vowels(string):
       vowels = ('a', 'e', 'i', 'o', 'u')
       return ''.join(c for c in string if c.lower() not in vowels)
  assert filter_vowels("hello")=="hll"
  assert filter_vowels("world")=="wrld"
  assert filter_vowels("Python")=="Pythn"
  assert filter_vowels("Aeiou")==""
  assert filter_vowels("")==""
output: def filter_vowels(string):
       vowels = ('a', 'e', 'i', 'o', 'u')
       return ''.join(c for c in string if c.lower() not in vowels)