Python string.translate() Examples

def derot(xset, hset, src):
    xset = eval(xset)
    hset = eval(hset)

    import string
    o = ''
    u = ''
    il = 0
    for first in hset:
        u += first
        o += xset[il]
        il += 1
    rot13 = string.maketrans(o, u)
    link = string.translate(src, rot13)
    xbmc.log('@#@DEROT-LINK: %s' % link, xbmc.LOGNOTICE)
    return link 

def do_simple_substitution(ciphertext, pt_charset, ct_charset):
   '''
   Perform simple substitution based on character sets

   Simplifies the use of string.translate(). If, for instance, you wish to
   transform a ciphertext where 'e' is swapped with 't', you would call this
   function like so:

   do_simple_substitution('Simplt subeieueion ciphtrs art silly','et','te')
   
   ciphertext - A string to translate
   pt_charset - The character set of the plaintext, usually 'abcdefghijk...xyz'
   ct_charset - The character set of the ciphertext
   '''
   #translate ciphertext to plaintext using mapping
   return string.translate(ciphertext, string.maketrans(ct_charset, pt_charset))


# TODO: Implement chi square 

def _normalize(title, charset='utf-8'):
    '''Removes all accents and illegal chars for titles from the String'''
    if isinstance(title, unicode):
        title = string.translate(title, allchars, deletechars)
        try:
            title = title.encode("utf-8")
            title = normalize('NFKD', title).encode('ASCII', 'ignore')
        except UnicodeEncodeError:
            logger.error("Error de encoding")
    else:
        title = string.translate(title, allchars, deletechars)
        try:
            # iso-8859-1
            title = title.decode(charset).encode('utf-8')
            title = normalize('NFKD', unicode(title, 'utf-8'))
            title = title.encode('ASCII', 'ignore')
        except UnicodeEncodeError:
            logger.error("Error de encoding")
    return title

    # 

def morse_decode(text, dot='.', dash='-', space=' '):
   '''
   Decodes a Morse encoded message. Optionally, you can provide an alternate
   single character for dot, dash, and space.

   Parameters:
   text - (string) A message to decode
   dot - (char) An alternate dot char
   dash - (char) An alternate dash char
   space - (char) A char to split the text on
   '''
   inverse_morse_table = map(lambda (x,y): (y,x), morse_table.items())
   dot_dash_trans = string.maketrans('.-', dot+dash)
   inverse_morse_table = [(string.translate(x,dot_dash_trans), y) for (x,y) in inverse_morse_table]
   inverse_morse_table = dict(inverse_morse_table)
   return ''.join([inverse_morse_table[char] for char in text.split(space) if char in inverse_morse_table.keys()]) 

def dump_dirs (self, msg):
        if DEBUG:
            from distutils.fancy_getopt import longopt_xlate
            print msg + ":"
            for opt in self.user_options:
                opt_name = opt[0]
                if opt_name[-1] == "=":
                    opt_name = opt_name[0:-1]
                if opt_name in self.negative_opt:
                    opt_name = string.translate(self.negative_opt[opt_name],
                                                longopt_xlate)
                    val = not getattr(self, opt_name)
                else:
                    opt_name = string.translate(opt_name, longopt_xlate)
                    val = getattr(self, opt_name)
                print "  %s: %s" % (opt_name, val) 

def get_attr_name (self, long_option):
        """Translate long option name 'long_option' to the form it
        has as an attribute of some object: ie., translate hyphens
        to underscores."""
        return string.translate(long_option, longopt_xlate) 

def break_rot(ciphertext, alphabet=string.lowercase):
    for rot in range(len(alphabet)):
        tr = string.maketrans(alphabet, ''.join([alphabet[rot:], alphabet[:rot]]))
        print(rot, string.translate(ciphertext, tr)) 

def update(self, data):
        if self._op:
            return translate(data, self._encrypt_table)
        else:
            return translate(data, self._decrypt_table) 

def translate_longopt(opt):
    """Convert a long option name to a valid Python identifier by
    changing "-" to "_".
    """
    return string.translate(opt, longopt_xlate) 

def remove_punctuation(s):
    return s.translate(string.maketrans("",""), string.punctuation) 

def _quote(str, LegalChars=_LegalChars,
           idmap=_idmap, translate=string.translate):
    #
    # If the string does not need to be double-quoted,
    # then just return the string.  Otherwise, surround
    # the string in doublequotes and precede quote (with a \)
    # special characters.
    #
    if "" == translate(str, idmap, LegalChars):
        return str
    else:
        return '"' + _nulljoin( map(_Translator.get, str, str) ) + '"'
# end _quote 

def set(self, key, val, coded_val,
            LegalChars=_LegalChars,
            idmap=_idmap, translate=string.translate):
        # First we verify that the key isn't a reserved word
        # Second we make sure it only contains legal characters
        if key.lower() in self._reserved:
            raise CookieError("Attempt to set a reserved key: %s" % key)
        if "" != translate(key, idmap, LegalChars):
            raise CookieError("Illegal key value: %s" % key)

        # It's a good key, so save it.
        self.key                 = key
        self.value               = val
        self.coded_value         = coded_val
    # end set 

def update(self, data):
        if self._op:
            return translate(data, self._encrypt_table)
        else:
            return translate(data, self._decrypt_table) 

def set(self, key, val, coded_val,
            LegalChars=_LegalChars,
            idmap=_idmap, translate=string.translate):
        # First we verify that the key isn't a reserved word
        # Second we make sure it only contains legal characters
        if key.lower() in self._reserved:
            raise CookieError("Attempt to set a reserved key: %s" % key)
        if "" != translate(key, idmap, LegalChars):
            raise CookieError("Illegal key value: %s" % key)

        # It's a good key, so save it.
        self.key                 = key
        self.value               = val
        self.coded_value         = coded_val
    # end set 

def translate_longopt(opt):
    """Convert a long option name to a valid Python identifier by
    changing "-" to "_".
    """
    return string.translate(opt, longopt_xlate) 

def get_attr_name (self, long_option):
        """Translate long option name 'long_option' to the form it
        has as an attribute of some object: ie., translate hyphens
        to underscores."""
        return string.translate(long_option, longopt_xlate) 

def update(self, data):
        if self._op:
            return translate(data, self._encrypt_table)
        else:
            return translate(data, self._decrypt_table) 

def update(self, data):
        if self._op:
            return translate(data, self._encrypt_table)
        else:
            return translate(data, self._decrypt_table) 

def set(
        self, key, val, coded_val,
            LegalChars=Cookie._LegalChars + ':',
            idmap=string._idmap, translate=string.translate):
        return super(MorselHook, self).set(
            key, val, coded_val, LegalChars, idmap, translate) 

def cleanstring(inputstring):
    ''' Replace all non-printable characters with dots to avoid breaking our terminal '''
    filter = ''.join([['.', chr(x)][chr(x) in string.printable[:-5]] for x in xrange(256)])
    return string.translate(inputstring, filter) 

def SUBSETN(n,table=string.maketrans(b'0123456789',b'ABCDEFGIJK'),translate=string.translate):
        return translate('%6.6d'%n,table)
#
# Helpers
# 

def SUBSETN(n,table=bytes.maketrans(b'0123456789',b'ABCDEFGIJK')):
        return bytes('%6.6d'%n,'ASCII').translate(table) 

def update(self, data):
        if self._op:
            return translate(data, self._encrypt_table)
        else:
            return translate(data, self._decrypt_table) 

def set(self, key, val, coded_val,
            LegalChars=_LegalChars,
            idmap=_idmap, translate=string.translate):
        # First we verify that the key isn't a reserved word
        # Second we make sure it only contains legal characters
        if key.lower() in self._reserved:
            raise CookieError("Attempt to set a reserved key: %s" % key)
        if "" != translate(key, idmap, LegalChars):
            raise CookieError("Illegal key value: %s" % key)

        # It's a good key, so save it.
        self.key                 = key
        self.value               = val
        self.coded_value         = coded_val
    # end set 

def _quote(str, LegalChars=_LegalChars,
           idmap=_idmap, translate=string.translate):
    #
    # If the string does not need to be double-quoted,
    # then just return the string.  Otherwise, surround
    # the string in doublequotes and precede quote (with a \)
    # special characters.
    #
    if "" == translate(str, idmap, LegalChars):
        return str
    else:
        return '"' + _nulljoin( map(_Translator.get, str, str) ) + '"'
# end _quote 

def _munge_whitespace(self, text):
        """_munge_whitespace(text : string) -> string

        Munge whitespace in text: expand tabs and convert all other
        whitespace characters to spaces.  Eg. " foo\tbar\n\nbaz"
        becomes " foo    bar  baz".
        """
        if self.expand_tabs:
            text = string.expandtabs(text)
        if self.replace_whitespace:
            if isinstance(text, type('')):
                text = string.translate(text, self.whitespace_trans)
            elif isinstance(text, unicode):
                text = string.translate(text, self.unicode_whitespace_trans)
        return text 

def morse_encode(text, dot='.', dash='-', space=' '):
   '''
   Encodes text into Morse code.
   '''
   dot_dash_trans = string.maketrans('.-', dot+dash)
   translated_morse_table = map(lambda (x,y): (x, string.translate(y, dot_dash_trans)), morse_table.items())
   translated_morse_table = dict(translated_morse_table)
   output = []
   for char in text.lower():
      if char in string.lowercase + string.digits:
         output.append(translated_morse_table[char])
   return space.join(output) 

def output_mask(text, charset):
   '''
   Output masking - mask all characters besides those in the provided character
   set with dots.
   
   Parameters:
   (string) text - output to mask
   (string) charset - string containing acceptable characters
   '''
   all_chars = output_chars = map(chr,range(256))
   charset = set(charset)
   for charnum in range(256):
      if all_chars[charnum] not in charset:
         output_chars[charnum] = '.'
   return string.translate(text,''.join(output_chars)) 

def translate_longopt(opt):
    """Convert a long option name to a valid Python identifier by
    changing "-" to "_".
    """
    return string.translate(opt, longopt_xlate) 

def b64sub(s, key):
    """
    "Encryption" method that base64 encodes a given string, 
    then does a randomized alphabetic letter substitution.
    """
    enc_tbl = string.maketrans(string.ascii_letters, key)
    return string.translate(base64.b64encode(s), enc_tbl)