This works well as a checking strategy, but what I want is a suggesting
list...
Maybe what I want is not practical at all?
Thanks anyway Peter.
Andy Wu
Andy ��道：
> The seems good to me, I'll try it out, thanks for the posting.
>
>
> "Peter Otten 写道：
> "
> > Andy wrote:
> >
> > > I'm trying to do some predicting work over user input, here's my
> > > question:
> > >
> > > for pattern r'match me', the string 'no' will definitely fail to match,
> > > but 'ma' still has a chance if user keep on inputting characters after
> > > 'ma', so how do I mark 'ma' as a possible match string?
> >
> > The following may or may not work in the real world:
> >
> > import re
> >
> > def parts(regex, flags=0):
> > candidates = []
> > for stop in reversed(range(1, len(regex)+1)):
> > partial = regex[:stop]
> > try:
> > r = re.compile(partial + "$", flags)
> > except re.error:
> > pass
> > else:
> > candidates.append(r)
> > candidates.reverse()
> > return candidates
> >
> > if __name__ == "__main__":
> > candidates = parts(r"[a-z]+\s*=\s*\d+", re.IGNORECASE)
> > def check(*args):
> > s = var.get()
> > for c in candidates:
> > m = c.match(s)
> > if m:
> > entry.configure(foreground="#008000")
> > break
> > else:
> > entry.configure(foreground="red")
> >
> >
> > import Tkinter as tk
> > root = tk.Tk()
> > var = tk.StringVar()
> > var.trace_variable("w", check)
> > entry = tk.Entry(textvariable=var)
> > entry.pack()
> > root.mainloop()
> >
> > The example lets you write an assignment of a numerical value, e. g
> >
> > meaning = 42
> >
> > and colours the text in green or red for legal/illegal entries.
> >
> > Peter
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