simple string backspace question

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  • vedrandekovic@v-programs.com
    #1

    simple string backspace question

    Hello,

    I have one simple string, backspace character question.Here is my
    example:
    >>text="Hello\b world"
    >>print text
    "HelloBSwor ld"

    Should this character "\b" (backspace) in this text return this:
    "Helloworld "?





    Regards,
    Vedran

    Tags: None
      • Lawrence Oluyede
        #2
        Re: simple string backspace question

        <vedrandekovic@ v-programs.comwro te:
        >text="Hello\bw orld"
        >print text
        "HelloBSwor ld"
        >
        Should this character "\b" (backspace) in this text return this:
        "Helloworld "?
        rhymes@groove ~ % python Python
        2.5.1 (r251:54869, Apr 18 2007, 22:08:04)
        [GCC 4.0.1 (Apple Computer, Inc. build 5367)] on darwin
        Type "help", "copyright" , "credits" or "license" for more information.
        >>text="Hello\b world"
        >>print text
        Hellworld

        What system are u using?

        --
        Lawrence, oluyede.org - neropercaso.it
        "It is difficult to get a man to understand
        something when his salary depends on not
        understanding it" - Upton Sinclair

            Comment

            • vedrandekovic@v-programs.com
              #3
              Re: simple string backspace question

              On 31 srp, 11:44, [email protected] wrote:
              Hello,
              >
              I have one simple string, backspace character question.Here is my
              example:
              >
              >text="Hello\bw orld"
              >print text
              >
              "HelloBSwor ld"
              >
              Should this character "\b" (backspace) in this text return this:
              "Helloworld "?
              >
              Regards,
              Vedran
              Hi,

              If you mean on operating system then unfortunately Windows XP.

              Regards,
              Vedran

                  Comment

                  • Lawrence Oluyede
                    #4
                    Re: simple string backspace question

                    <vedrandekovic@ v-programs.comwro te:
                    If you mean on operating system then unfortunately Windows XP.
                    I don't know for sure but maybe it doesn't support all ASCII escapes
                    codes.

                    Why do you care about \b anyway :-) ?

                    --
                    Lawrence, oluyede.org - neropercaso.it
                    "It is difficult to get a man to understand
                    something when his salary depends on not
                    understanding it" - Upton Sinclair

                        Comment

                        • vedrandekovic@v-programs.com
                          #5
                          Re: simple string backspace question

                          On 31 srp, 12:03, [email protected] (Lawrence Oluyede) wrote:
                          <vedrandeko...@ v-programs.comwro te:
                          If you mean on operating system then unfortunately Windows XP.
                          >
                          I don't know for sure but maybe it doesn't support all ASCII escapes
                          codes.
                          >
                          Why do you care about \b anyway :-) ?
                          >
                          --
                          Lawrence, oluyede.org - neropercaso.it
                          "It is difficult to get a man to understand
                          something when his salary depends on not
                          understanding it" - Upton Sinclair
                          Hi,

                          I need this inevitable for my "programmin g language", for code
                          indentation. I don't know how to write script with module tokenize
                          for code indentation.

                          Regards,
                          Vedran

                              Comment

                              • Diez B. Roggisch
                                #6
                                Re: simple string backspace question

                                [email protected] wrote:
                                On 31 srp, 12:03, [email protected] (Lawrence Oluyede) wrote:
                                ><vedrandeko... @v-programs.comwro te:
                                If you mean on operating system then unfortunately Windows XP.
                                >>
                                >I don't know for sure but maybe it doesn't support all ASCII escapes
                                >codes.
                                >>
                                >Why do you care about \b anyway :-) ?
                                >>
                                >--
                                >Lawrence, oluyede.org - neropercaso.it
                                >"It is difficult to get a man to understand
                                >something when his salary depends on not
                                >understandin g it" - Upton Sinclair
                                >
                                Hi,
                                >
                                I need this inevitable for my "programmin g language", for code
                                indentation. I don't know how to write script with module tokenize
                                for code indentation.
                                Still not giving up reinventing the wheel? You should take some lessons on
                                syntax analysis before attempting this. But I know this words won't be
                                heard...

                                So, to your actual problem: that backspace is removing a character is
                                something an editor or a terminal do, because they interpret the backspace.
                                You wouldn't expect the string "<font color="blue">fo o</font>" to be
                                rendered blue by magic as well, wouldn't you?

                                So what you need to do is: search the string for backspaces, and remove the
                                BS as well as the character before. Something along these lines (untested):

                                teststring = "abc\bcde\b "

                                while teststring.find ("\b") -1:
                                pos = teststring.find ("\b")
                                teststring = teststring[:pos-1] + teststring[pos+1:]


                                Diez

                                    Comment

                                    • John Machin
                                      #7
                                      Re: simple string backspace question

                                      On Jul 31, 10:33 pm, Dustan <DustanGro...@g mail.comwrote:
                                      On Jul 31, 7:17 am, John Machin <sjmac...@lexic on.netwrote:
                                      >
                                      >
                                      >
                                      On Jul 31, 8:01 pm, [email protected] wrote:
                                      >
                                      On 31 srp, 11:44, [email protected] wrote:
                                      >
                                      Hello,
                                      >
                                      I have one simple string, backspace character question.Here is my
                                      example:
                                      >
                                      >>text="Hello\b world"
                                      >>print text
                                      >
                                      "HelloBSwor ld"
                                      >
                                      Should this character "\b" (backspace) in this text return this:
                                      "Helloworld "?
                                      >
                                      Regards,
                                      Vedran
                                      >
                                      Hi,
                                      >
                                      If you mean on operating system then unfortunately Windows XP.
                                      >
                                      Point (1) Works on Windows XP for me:
                                      >
                                      C:\junk>ver
                                      >
                                      Microsoft Windows XP [Version 5.1.2600]
                                      >
                                      C:\junk>\python 25\python
                                      Python 2.5.1 (r251:54863, Apr 18 2007, 08:51:08) [MSC v.1310 32 bit
                                      (Intel)] on win32
                                      Type "help", "copyright" , "credits" or "license" for more information.
                                      >
                                      >>text = "Hello\bwor ld"
                                      >>print text
                                      Hellworld
                                      >
                                      or, for mild amusement:
                                      >
                                      >>import sys, time
                                      >>for x in xrange(100):
                                      >
                                      ... sys.stdout.writ e("|/-\\"[x & 3] + "\b")
                                      ... time.sleep(0.1)
                                      ...
                                      >
                                      Now try it on IDLE.
                                      So the OP should have been slagging off at PythonWin and IDLE, not at
                                      Windows.


                                          Comment

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