Calculates vowel probabilities in a text

vowel_prob.py

import re
import sys

yevgeny = ""
vowels_after_vowels = 0.0
vowels_after_consonants = 0.0
number_of_vowels = 0.0
vowels = [ "a", "e", "i", "o", "u", "A", "E", "I", "O", "U" ]



with open('yevgenyOnegin.txt') as _yev:
    yevgeny = _yev.read()

# strip all spaces in string
yevgeny = re.sub(r'((?!\w).)|\s+', '', yevgeny)
print(yevgeny)
yev_len = len(yevgeny)

for i in range( 1, yev_len ):
    # Check if the letter is a vowel
    if not yevgeny[i] in vowels:
        print(yevgeny[i])
        continue

    number_of_vowels += 1

    # Check previous letter is vowel
    if yevgeny[i - 1] in vowels:
        vowels_after_vowels += 1
    elif not yevgeny[i - 1] in vowels:
        vowels_after_consonants += 1

# Results
print( "Prob of\n" )
print( "Vowel after vowel: %f" % (vowels_after_vowels / yev_len) )
print( "Vowel after consonant: %f" % (vowels_after_consonants / yev_len) )
print( "Vowel: %f" % (number_of_vowels / yev_len) )