regular expression

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  • Wiebke Pätzold
    #1

    regular expression

    Hi all,

    I wrote a little program. Here it is:

    import sys
    import Mk4py

    db = Mk4py.storage(" c:\\datafile.mk ",1)
    vw = db.view("people ")

    def func(row):
    try:
    if row.Nachname[0:1]=='G':
    return 1
    else:
    return 0
    except AttributeError:
    return 0


    vf = vw.filter(func)

    for r in vf:
    print vw[r.index].Nachname,vw[r.index].Kongressbereic h


    I create a database that contains a table. 'Nachname' and
    'Kongressbereic h' are special fieldnames. This program can search for
    a special letter. In my example it is 'G'. and the search takes place
    in 'Nachname'.
    Mow I want to use regular expression. So that I can limit my search.
    For example: I can search for Ge and it is not relevant wich letters
    follow
    Could somebody help me with this task?

    Wiebke
    Tags: None
    • Thomas Güttler
      #2
      Re: regular expression

      Wiebke Pätzold wrote:
      [color=blue]
      > On Thu, 31 Jul 2003 14:24:01 +0200, Thomas Güttler
      > <guettler@thoma s-guettler.de> wrote:
      >[color=green]
      >>Wiebke Pätzold wrote:[/color][/color]

      Please cut unimportant parts if you reply.
      [color=blue]
      > Can you tell me please on wich place in my program the if-statement
      > will be inserted?[/color]

      At the same place where you have it (if ...=="G")
      [color=blue]
      > And then I have another question too. After the if statement there
      > must be a print statement. I have no idea how I must write my program
      > so that it is right and executably.
      > Can you write it me exactly how this program should look like?[/color]

      You seem to be running on windows ("C:\..."). I think double-clicking
      on it should execute it.

      If you want to make it executable without python installed: Have a look
      at py2exe.

      Since you seem to be a german: Maybe my Python introduction helps you:
      Python, Programmieren macht Spaß
      http://www.thomas-guettler.de/vortraege/python/einfuehrung.html


      thomas


        Comment

        • Wiebke Pätzold
          #3
          Re: regular expression

          On Thu, 31 Jul 2003 10:46:59 -0500, Jeff Epler <jepler@unpytho nic.net>
          wrote:
          [color=blue]
          >These are all untested, because I don't have Mk4py or your datafile to
          >try it on.
          >
          >I might write this:
          > import re
          > pattern = re.compile("^Ge ")
          > def func(row):
          > try:
          > nachname = row.Nachname
          > except AttributeError:
          > return 0
          > return pattern.search( nachname) is not None
          >
          > vf = vw.filter(func)
          >
          >If you're using a Python version with nested scopes, you could use them
          >in this case:
          > import re
          > def make_func(patte rn):
          > pattern = re.compile(patt ern)
          > def func(row):
          > try:
          > nachname = row.Nachname
          > except AttributeError:
          > return 0
          > return pattern.search( nachname) is not None
          > return func
          >
          > vf = vw.filter(make_ func("^Ge"))
          >
          >or you can make a callable filter object by using classes:
          > import re
          > class PatternFilter:
          > def __init__(self, pattern):
          > self.pattern = re.compile(patt ern)
          >
          > def __call__(self, row):
          > try:
          > nachname = row.Nachname
          > except AttributeError:
          > return 0
          > return self.pattern.se arch(Nachname) is not None
          > vf = vw.filter(Patte rnFilter("^Ge") )
          >
          >Jeff[/color]

          thank you for the part of the program.
          But I have one question.
          If I insert your first suggestion- there is print nothin. Is it
          possible that there is missing something?

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