random_str.py

import random


def get_vow(): return random.choice(list('уеыаоэяию'))


def get_con(): return random.choice(list('йцкнгшщзхфвпрлджчсмтб'))


def get_word(length=0):
    vow = con = 0
    result = ''

    while length > 0:
        if vow > 1:
            result += get_con()
            con += 1
            vow = 0
        elif con > 1:
            result += get_vow()
            vow += 1
            con = 0
        elif random.randint(0, 1) == 1:
            result += get_con()
            con += 1
            vow = 0
        else:
            result += get_vow()
            vow += 1
            con = 0

        length -= 1
    return result


word_count = random.randint(3, 7)
line = ''

while word_count > 0:
    line += get_word(random.randint(2, 7))
    line += ',' if random.randint(0, 5) == 0 and word_count != 1 else ''
    line += random.choice(['.'] * 5 + ['!', '?', '?!', '!!']) if word_count == 1 else ' '
    word_count -= 1

print(line.capitalize())