def disemvowel(sentence):
    """Disemvowel:
    Given a sentence, return the sentence with all vowels removed.
        >>> disemvowel('the quick brown fox jumps over the lazy dog')
        'th qck brwn fx jmps vr th lzy dg'
    """
    vowels = ('a','e','i','o','u')
    for x in sentence:
        if x in vowels:
            sentence = sentence.replace(x,"")
    return sentence
    pass