Convert from katakana to vowel kana [python]

Overview

I made a function that returns a vowel when a katakana character string is input, such as "Konichiha-> Onia".

Conversion rules

Leave "n" and "tsu" as they are (Example: Ludicolo-> Unaa) Make "-" (long sound) the same as the previous vowel (example: cola-> oa) If the immediately preceding kana is "to" or "do", "u" is regarded as one character and treated in the same way as uppercase letters (example: Ducchi-> Uui, Uaa-> Uaa). "Ya", "e", and "yo" are treated as one character when the immediately preceding kana is in the I stage, and in other cases, they are treated in the same way as uppercase letters. (Example: Catatsu-> Aau, Kee-> E) "U" is regarded as one kana if the immediately preceding kana is "i", "te" and "de", and is treated as a capital letter in other cases (example: tulle-> u, dewar-> dewar). ) If the immediately preceding kana is U-dan, "ヮ", "a", "e", and "o" are treated as one kana together with it, and in other cases, they are treated as uppercase letters. (Example: Way-> Aei) If the previous kana is U-dan and "te" or "de", "i" is regarded as one kana, and in other cases, it is treated as an uppercase letter (eg Lemon Tea-> Eonii, IKEA-> IKEA) Leave the characters other than katakana as they are.

environment

It has been confirmed to run on Google Colaboratory (as of March 27, 2020) and macOS Catalina, Python 3.8.0.

code

def kana2vowel(text):
    #Uppercase and u conversion list
    large_tone = {
        'A' :'A', 'I' :'I', 'C' :'C', 'D' :'D', 'Oh' :'Oh',
        'U': 'C', 'Vu': 'C',
        'Mosquito' :'A', 'Ki' :'I', 'Ku' :'C', 'Ke' :'D', 'Ko' :'Oh',
        'Service' :'A', 'Shi' :'I', 'Su' :'C', 'Se' :'D', 'So' :'Oh',
        'Ta' :'A', 'Ji' :'I', 'Tsu' :'C', 'Te' :'D', 'To' :'Oh',
        'Na' :'A', 'D' :'I', 'Nu' :'C', 'Ne' :'D', 'No' :'Oh',
        'C' :'A', 'Hi' :'I', 'Fu' :'C', 'F' :'D', 'E' :'Oh',
        'Ma' :'A', 'Mi' :'I', 'Mu' :'C', 'Me' :'D', 'Mo' :'Oh',
        'Ya' :'A', 'Yu' :'C', 'Yo' :'Oh',
        'La' :'A', 'Li' :'I', 'Le' :'C', 'Re' :'D', 'B' :'Oh',
        'Wow' :'A', 'Wo' :'Oh', 'Down' :'Down', 'Vu' :'C',
        'Moth' :'A', 'Gi' :'I', 'Gu' :'C', 'Ge' :'D', 'Go' :'Oh',
        'The' :'A', 'The' :'I', 'Zu' :'C', 'Ze' :'D', 'Zo' :'Oh',
        'Da' :'A', 'Di' :'I', 'Zu' :'C', 'De' :'D', 'Do' :'Oh',
        'Ba' :'A', 'Bi' :'I', 'Bu' :'C', 'Be' :'D', 'Bo' :'Oh',
        'Pacific League' :'A', 'Pi' :'I', 'Pu' :'C', 'Pe' :'D', 'Po' :'Oh'
    }

    #To/Do+'U'To c
    for k in 'Steller sea lion':
        while k+'U' in text:
            text = text.replace(k+'U','C')
    #Te/De+I/I/Convert to c
    for k in 'Tedde':
        for k2,v in zip('Ju','Iu'):
            while k+k2 in text:
                text = text.replace(k+k2,v)

    #Convert uppercase letters and u to vowels
    text = list(text)
    for i, v in enumerate(text):
        if v in large_tone:
            text[i] = large_tone[v]
    text = ''.join(text)

    #Convert Wu to Wu
    while 'Wu' in text:
        text = text.replace('Wu','U')

    #C+ヮ/A/I/E/Convert o to vowel
    for k,v in zip('ヮ yeo','Aieo'):
        text = text.replace('C'+k,v)
    
    #E/Good/Convert to good
    for k in 'Yeah':
        while k+'-' in text:
            text = text.replace(k+'-',k+'I')

    #I/I+Turbocharger/Yu/E/Convert yo to vowel
    for k,v in zip('Nyayo','Aueo'):
        text = text.replace('I'+k, v).replace('I'+k, v)
    
    #Convert the remaining lowercase letters to vowels
    for k,v in zip('Eyayo','Aiaioauo'):
        text = text.replace(k,v)
    
    #-Convert (long sound) to vowel
    for k in 'a-I-U-E-O':
        while k+'-' in text:
            text = text.replace(k+'-',k+k)
    
    return text