regular expression

[Wiebke Pätzold]

On Thu, 31 Jul 2003 10:46:59 -0500, Jeff Epler <jepler at unpythonic.net>
wrote:

>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(pattern):
>        pattern = re.compile(pattern)
>        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(pattern)
>
>        def __call__(self, row):
>            try:
>                nachname = row.Nachname
>            except AttributeError:
>                return 0
>            return self.pattern.search(Nachname) is not None
>    vf = vw.filter(PatternFilter("^Ge"))
>
>Jeff

I have found the error I have made. Your program was all right. Thank
you very much.