Character Translation using Python (like the tr command)












36















Is there a way to do character translation (kind of like the tr command) using python






python







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  • For a Perl guy, calling it translation — as opposed to transliteration — made finding the right thing to do a bit more complicated.

    – Trenton
    Oct 16 '18 at 17:36
















36















Is there a way to do character translation (kind of like the tr command) using python






python







share|improve this question























  • For a Perl guy, calling it translation — as opposed to transliteration — made finding the right thing to do a bit more complicated.

    – Trenton
    Oct 16 '18 at 17:36














36












36








36


2






Is there a way to do character translation (kind of like the tr command) using python






python







share|improve this question














Is there a way to do character translation (kind of like the tr command) using python






python




python






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asked Feb 17 '09 at 6:33









hhafezhhafez

21.2k32104137




21.2k32104137













  • For a Perl guy, calling it translation — as opposed to transliteration — made finding the right thing to do a bit more complicated.

    – Trenton
    Oct 16 '18 at 17:36



















  • For a Perl guy, calling it translation — as opposed to transliteration — made finding the right thing to do a bit more complicated.

    – Trenton
    Oct 16 '18 at 17:36

















For a Perl guy, calling it translation — as opposed to transliteration — made finding the right thing to do a bit more complicated.

– Trenton
Oct 16 '18 at 17:36





For a Perl guy, calling it translation — as opposed to transliteration — made finding the right thing to do a bit more complicated.

– Trenton
Oct 16 '18 at 17:36












5 Answers
5






active

oldest

votes


















37














See string.translate



import string

"abc".translate(string.maketrans("abc", "def")) # => "def"


Note the doc's comments about subtleties in the translation of unicode strings.



Edit: Since tr is a bit more advanced, also consider using re.sub.






share|improve this answer





















  • 8





    For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

    – SparkAndShine
    Jul 18 '15 at 23:58





















20














If you're using python3 translate is less verbose:



>>> 'abc'.translate(str.maketrans('ac','xy'))

'xby'


Ahh.. and there is also equivalent to tr -d:



>>> "abc".translate(str.maketrans('','','b'))

'ac'


For tr -d with python2.x use an additional argument to translate function:



>>> "abc".translate(None, 'b')

'ac'





share|improve this answer





















  • 1





    is there an equivalent for tr -cd?

    – Sundeep
    Jun 27 '16 at 8:50



















5














I has developed python-tr, implemented tr algorithm.
Let's try it.



Install:



$ pip install python-tr


Example:



>>> from tr import tr

>>> tr('bn', 'cr', 'bunny')

'curry'

>>> tr('n', '', 'bunny', 'd')

'buy'

>>> tr('n', 'u', 'bunny', 'c')

'uunnu'

>>> tr('n', '', 'bunny', 's')

'buny'

>>> tr('bn', '', 'bunny', 'cd')

'bnn'

>>> tr('bn', 'cr', 'bunny', 'cs')

'brnnr'

>>> tr('bn', 'cr', 'bunny', 'ds')

'uy'



  • https://pypi.python.org/pypi/python-tr

  • https://github.com/ikegami-yukino/python-tr






share|improve this answer































    1














    In Python 2, unicode.translate() accepts ordinary mappings, ie. there's no need to import anything either:



    >>> u'abc+-'.translate({ord('+'): u'-', ord('-'): u'+', ord('b'): None})
    
u'ac-+'


    The translate() method is especially useful for swapping characters (as '+' and '-' above), which can't be done with replace(), and using re.sub() isn't very straightforward for that purpose either.



    I have to admit, however, that the repeated use of ord() doesn't make the code look like nice and tidy.






    share|improve this answer































      -4














      A simpler approach may be to use replace. e.g.



       "abc".replace("abc", "def")
      
'def'


      No need to import anything. Works in Python 2.x






      share|improve this answer



















      • 5





        it works in Python 3 as well but doesn't do what the OP is asking for.

        – iruvar
        Oct 3 '13 at 18:02






      • 1





        the translation cb to wt should transform cabbage to wattage

        – Jasen
        Sep 25 '15 at 1:14













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      5 Answers
      5






      active

      oldest

      votes








      5 Answers
      5






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      37














      See string.translate



      import string
      
"abc".translate(string.maketrans("abc", "def")) # => "def"


      Note the doc's comments about subtleties in the translation of unicode strings.



      Edit: Since tr is a bit more advanced, also consider using re.sub.






      share|improve this answer





















      • 8





        For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

        – SparkAndShine
        Jul 18 '15 at 23:58


















      37














      See string.translate



      import string
      
"abc".translate(string.maketrans("abc", "def")) # => "def"


      Note the doc's comments about subtleties in the translation of unicode strings.



      Edit: Since tr is a bit more advanced, also consider using re.sub.






      share|improve this answer





















      • 8





        For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

        – SparkAndShine
        Jul 18 '15 at 23:58
















      37












      37








      37







      See string.translate



      import string
      
"abc".translate(string.maketrans("abc", "def")) # => "def"


      Note the doc's comments about subtleties in the translation of unicode strings.



      Edit: Since tr is a bit more advanced, also consider using re.sub.






      share|improve this answer















      See string.translate



      import string
      
"abc".translate(string.maketrans("abc", "def")) # => "def"


      Note the doc's comments about subtleties in the translation of unicode strings.



      Edit: Since tr is a bit more advanced, also consider using re.sub.







      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited May 12 '12 at 10:21









      robert

      22.9k84668




      22.9k84668










      answered Feb 17 '09 at 6:40









      Richard LevasseurRichard Levasseur

      9,87854155




      9,87854155








      • 8





        For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

        – SparkAndShine
        Jul 18 '15 at 23:58
















      • 8





        For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

        – SparkAndShine
        Jul 18 '15 at 23:58










      8




      8





      For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

      – SparkAndShine
      Jul 18 '15 at 23:58







      For python3, 'module' object has no attribute 'maketrans'. Use "abc".translate(str.maketrans("abc", "def")) directly!

      – SparkAndShine
      Jul 18 '15 at 23:58















      20














      If you're using python3 translate is less verbose:



      >>> 'abc'.translate(str.maketrans('ac','xy'))
      
'xby'


      Ahh.. and there is also equivalent to tr -d:



      >>> "abc".translate(str.maketrans('','','b'))
      
'ac'


      For tr -d with python2.x use an additional argument to translate function:



      >>> "abc".translate(None, 'b')
      
'ac'





      share|improve this answer





















      • 1





        is there an equivalent for tr -cd?

        – Sundeep
        Jun 27 '16 at 8:50
















      20














      If you're using python3 translate is less verbose:



      >>> 'abc'.translate(str.maketrans('ac','xy'))
      
'xby'


      Ahh.. and there is also equivalent to tr -d:



      >>> "abc".translate(str.maketrans('','','b'))
      
'ac'


      For tr -d with python2.x use an additional argument to translate function:



      >>> "abc".translate(None, 'b')
      
'ac'





      share|improve this answer





















      • 1





        is there an equivalent for tr -cd?

        – Sundeep
        Jun 27 '16 at 8:50














      20












      20








      20







      If you're using python3 translate is less verbose:



      >>> 'abc'.translate(str.maketrans('ac','xy'))
      
'xby'


      Ahh.. and there is also equivalent to tr -d:



      >>> "abc".translate(str.maketrans('','','b'))
      
'ac'


      For tr -d with python2.x use an additional argument to translate function:



      >>> "abc".translate(None, 'b')
      
'ac'





      share|improve this answer















      If you're using python3 translate is less verbose:



      >>> 'abc'.translate(str.maketrans('ac','xy'))
      
'xby'


      Ahh.. and there is also equivalent to tr -d:



      >>> "abc".translate(str.maketrans('','','b'))
      
'ac'


      For tr -d with python2.x use an additional argument to translate function:



      >>> "abc".translate(None, 'b')
      
'ac'






      share|improve this answer














      share|improve this answer



      share|improve this answer








      edited Sep 12 '16 at 22:29









      Telemachus

      16.6k64778




      16.6k64778










      answered Sep 6 '09 at 12:17









      Piotr CzaplaPiotr Czapla

      14.5k2177105




      14.5k2177105








      • 1





        is there an equivalent for tr -cd?

        – Sundeep
        Jun 27 '16 at 8:50














      • 1





        is there an equivalent for tr -cd?

        – Sundeep
        Jun 27 '16 at 8:50








      1




      1





      is there an equivalent for tr -cd?

      – Sundeep
      Jun 27 '16 at 8:50





      is there an equivalent for tr -cd?

      – Sundeep
      Jun 27 '16 at 8:50











      5














      I has developed python-tr, implemented tr algorithm.
      Let's try it.



      Install:



      $ pip install python-tr


      Example:



      >>> from tr import tr
      
>>> tr('bn', 'cr', 'bunny')
      
'curry'
      
>>> tr('n', '', 'bunny', 'd')
      
'buy'
      
>>> tr('n', 'u', 'bunny', 'c')
      
'uunnu'
      
>>> tr('n', '', 'bunny', 's')
      
'buny'
      
>>> tr('bn', '', 'bunny', 'cd')
      
'bnn'
      
>>> tr('bn', 'cr', 'bunny', 'cs')
      
'brnnr'
      
>>> tr('bn', 'cr', 'bunny', 'ds')
      
'uy'



      • https://pypi.python.org/pypi/python-tr

      • https://github.com/ikegami-yukino/python-tr






      share|improve this answer




























        5














        I has developed python-tr, implemented tr algorithm.
        Let's try it.



        Install:



        $ pip install python-tr


        Example:



        >>> from tr import tr
        
>>> tr('bn', 'cr', 'bunny')
        
'curry'
        
>>> tr('n', '', 'bunny', 'd')
        
'buy'
        
>>> tr('n', 'u', 'bunny', 'c')
        
'uunnu'
        
>>> tr('n', '', 'bunny', 's')
        
'buny'
        
>>> tr('bn', '', 'bunny', 'cd')
        
'bnn'
        
>>> tr('bn', 'cr', 'bunny', 'cs')
        
'brnnr'
        
>>> tr('bn', 'cr', 'bunny', 'ds')
        
'uy'



        • https://pypi.python.org/pypi/python-tr

        • https://github.com/ikegami-yukino/python-tr






        share|improve this answer


























          5












          5








          5







          I has developed python-tr, implemented tr algorithm.
          Let's try it.



          Install:



          $ pip install python-tr


          Example:



          >>> from tr import tr
          
>>> tr('bn', 'cr', 'bunny')
          
'curry'
          
>>> tr('n', '', 'bunny', 'd')
          
'buy'
          
>>> tr('n', 'u', 'bunny', 'c')
          
'uunnu'
          
>>> tr('n', '', 'bunny', 's')
          
'buny'
          
>>> tr('bn', '', 'bunny', 'cd')
          
'bnn'
          
>>> tr('bn', 'cr', 'bunny', 'cs')
          
'brnnr'
          
>>> tr('bn', 'cr', 'bunny', 'ds')
          
'uy'



          • https://pypi.python.org/pypi/python-tr

          • https://github.com/ikegami-yukino/python-tr






          share|improve this answer













          I has developed python-tr, implemented tr algorithm.
          Let's try it.



          Install:



          $ pip install python-tr


          Example:



          >>> from tr import tr
          
>>> tr('bn', 'cr', 'bunny')
          
'curry'
          
>>> tr('n', '', 'bunny', 'd')
          
'buy'
          
>>> tr('n', 'u', 'bunny', 'c')
          
'uunnu'
          
>>> tr('n', '', 'bunny', 's')
          
'buny'
          
>>> tr('bn', '', 'bunny', 'cd')
          
'bnn'
          
>>> tr('bn', 'cr', 'bunny', 'cs')
          
'brnnr'
          
>>> tr('bn', 'cr', 'bunny', 'ds')
          
'uy'



          • https://pypi.python.org/pypi/python-tr

          • https://github.com/ikegami-yukino/python-tr







          share|improve this answer












          share|improve this answer



          share|improve this answer










          answered Jan 15 '15 at 13:11









          Yukino IkegamiYukino Ikegami

          8214




          8214























              1














              In Python 2, unicode.translate() accepts ordinary mappings, ie. there's no need to import anything either:



              >>> u'abc+-'.translate({ord('+'): u'-', ord('-'): u'+', ord('b'): None})
              
u'ac-+'


              The translate() method is especially useful for swapping characters (as '+' and '-' above), which can't be done with replace(), and using re.sub() isn't very straightforward for that purpose either.



              I have to admit, however, that the repeated use of ord() doesn't make the code look like nice and tidy.






              share|improve this answer




























                1














                In Python 2, unicode.translate() accepts ordinary mappings, ie. there's no need to import anything either:



                >>> u'abc+-'.translate({ord('+'): u'-', ord('-'): u'+', ord('b'): None})
                
u'ac-+'


                The translate() method is especially useful for swapping characters (as '+' and '-' above), which can't be done with replace(), and using re.sub() isn't very straightforward for that purpose either.



                I have to admit, however, that the repeated use of ord() doesn't make the code look like nice and tidy.






                share|improve this answer


























                  1












                  1








                  1







                  In Python 2, unicode.translate() accepts ordinary mappings, ie. there's no need to import anything either:



                  >>> u'abc+-'.translate({ord('+'): u'-', ord('-'): u'+', ord('b'): None})
                  
u'ac-+'


                  The translate() method is especially useful for swapping characters (as '+' and '-' above), which can't be done with replace(), and using re.sub() isn't very straightforward for that purpose either.



                  I have to admit, however, that the repeated use of ord() doesn't make the code look like nice and tidy.






                  share|improve this answer













                  In Python 2, unicode.translate() accepts ordinary mappings, ie. there's no need to import anything either:



                  >>> u'abc+-'.translate({ord('+'): u'-', ord('-'): u'+', ord('b'): None})
                  
u'ac-+'


                  The translate() method is especially useful for swapping characters (as '+' and '-' above), which can't be done with replace(), and using re.sub() isn't very straightforward for that purpose either.



                  I have to admit, however, that the repeated use of ord() doesn't make the code look like nice and tidy.







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered Apr 18 '14 at 17:41









                  lenzlenz

                  3,04441832




                  3,04441832























                      -4














                      A simpler approach may be to use replace. e.g.



                       "abc".replace("abc", "def")
                      
'def'


                      No need to import anything. Works in Python 2.x






                      share|improve this answer



















                      • 5





                        it works in Python 3 as well but doesn't do what the OP is asking for.

                        – iruvar
                        Oct 3 '13 at 18:02






                      • 1





                        the translation cb to wt should transform cabbage to wattage

                        – Jasen
                        Sep 25 '15 at 1:14


















                      -4














                      A simpler approach may be to use replace. e.g.



                       "abc".replace("abc", "def")
                      
'def'


                      No need to import anything. Works in Python 2.x






                      share|improve this answer



















                      • 5





                        it works in Python 3 as well but doesn't do what the OP is asking for.

                        – iruvar
                        Oct 3 '13 at 18:02






                      • 1





                        the translation cb to wt should transform cabbage to wattage

                        – Jasen
                        Sep 25 '15 at 1:14
















                      -4












                      -4








                      -4







                      A simpler approach may be to use replace. e.g.



                       "abc".replace("abc", "def")
                      
'def'


                      No need to import anything. Works in Python 2.x






                      share|improve this answer













                      A simpler approach may be to use replace. e.g.



                       "abc".replace("abc", "def")
                      
'def'


                      No need to import anything. Works in Python 2.x







                      share|improve this answer












                      share|improve this answer



                      share|improve this answer










                      answered Oct 3 '13 at 18:00









                      Chris HaagChris Haag

                      1




                      1








                      • 5





                        it works in Python 3 as well but doesn't do what the OP is asking for.

                        – iruvar
                        Oct 3 '13 at 18:02






                      • 1





                        the translation cb to wt should transform cabbage to wattage

                        – Jasen
                        Sep 25 '15 at 1:14
















                      • 5





                        it works in Python 3 as well but doesn't do what the OP is asking for.

                        – iruvar
                        Oct 3 '13 at 18:02






                      • 1





                        the translation cb to wt should transform cabbage to wattage

                        – Jasen
                        Sep 25 '15 at 1:14










                      5




                      5





                      it works in Python 3 as well but doesn't do what the OP is asking for.

                      – iruvar
                      Oct 3 '13 at 18:02





                      it works in Python 3 as well but doesn't do what the OP is asking for.

                      – iruvar
                      Oct 3 '13 at 18:02




                      1




                      1





                      the translation cb to wt should transform cabbage to wattage

                      – Jasen
                      Sep 25 '15 at 1:14







                      the translation cb to wt should transform cabbage to wattage

                      – Jasen
                      Sep 25 '15 at 1:14




















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