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def VigenereEnc(PlainText,Key):
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    PlainText = PlainText.upper()
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    Key = Key.upper()
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    outstr = ""
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    for i in xrange(len(PlainText)):
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        plainc = PlainText[i]
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        keyc = Key[i%(len(Key)-1)]
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        plainnum = ord(plainc)-65
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        keynum = ord(keyc)-65
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        outstr += chr((plainnum+keynum)%26+65)
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    print outstr
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︡
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def VigenereDec(CipherText,Key):
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    CipherText = CipherText.upper()
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    Key = Key.upper()
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    outstr = ""
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    for i in xrange(len(CipherText)):
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        cipherc = CipherText[i]
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        keyc = Key[i%(len(Key)-1)]
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        ciphernum = ord(cipherc)-65
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        keynum = ord(keyc)-65
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        outstr += chr((ciphernum-keynum)%26+65)
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    print outstr
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︡
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