def generate_username(formatStr,capitalize=True):
    """Generate random user name. formatStr is like CVC-CVC which generates username with consonant-vowel-consonant-consonant-vowel-consonant"""
    import random
    import re

    vowels="eyuioa"
    consonants="mnbvcxzlkjhgfdsptrwq"

    def randomVowel():
        return random.choice(vowels)

    def randomConsonant():
        return random.choice(consonants)

    regex = re.compile('[^a-zA-Z+]')
    formatStr=regex.sub('', formatStr)
    username=[]
    for c in formatStr.upper():
        if c=="C":
            username.append(randomConsonant())
        if c=="V":
            username.append(randomVowel())
        if c=="+":
            username.append(" ")
    username="".join(username)
    if capitalize==True:
        username= username.capitalize()

    return username

print(generate_username("CVCCVC"))