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to be able to get data out of such a file.
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zd = _ZipDecrypter(mypwd)
plain_char = zd(cypher_char)
plain_text = map(zd, cypher_text)
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or append 'a'.
compression: ZIP_STORED (no compression), ZIP_DEFLATED (requires zlib),
ZIP_BZIP2 (requires bz2) or ZIP_LZMA (requires lzma).
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needed, otherwise it will raise an exception when this would
be necessary.
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pwd is the password to decrypt files (only used for reading).
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