🌐 Mailman 3 August 2004 - Python-list - python.org

Re: EOL - scanning single-quoted string
by Ajay Aug. 4, 2004

Aug. 4, 2004

hi! i got the escape character bit, but i still get an error >>> str='/My Documents/um_ajay.xml' >>> re.subn('/', '\\', str) Traceback (most recent call last): File "<stdin>", line 1, in ? File "c:\Python23\lib\sre.py", line 151, in subn return _compile(pattern, 0).subn(repl, string, count) File "c:\Python23\lib\sre.py", line 258, in _subx template = _compile_repl(template, pattern) File "c:\Python23\lib\sre.py", line 245, in _compile_repl raise error, v # invalid expression sre_constants.error: bogus escape (end of line) any ideas? cheers -- Ajay Brar, CS Honours 2004 Smart Internet Technology Research Group Quoting Gandalf <gandalf(a)geochemsource.com>: > > Hi Ajay! > > The problem is that you must represent the backslash as '\\'. This is > because a simple backslash opens an escape sequence. > For example: > > '\n' - this is new line > '\t' - this is TAB > '\\' - this is the backslash itself > > You should use this: > > re.subn('/', '\\', str) > > The other way is to use raw strings. You can read more about these > things here: > > http://docs.python.org/ref/strings.html > > Best, > > Laci 2.0 > > > > > Ajay wrote: > > >hi! > > > >I am developing an application for a pocket pc. > >i have a small gui which allows users to select files using a file > dialog > >box. however the file, selected is represented as '/My Documents/test' > >which when i try to open gives me an error. > >so what i would like to do is replace '/' by the windows '\' > >however when i try > >str='/My Documents/test' > >re.subn('/', '\', str) > > > >i get an error saying - SyntaxError: EOL while scanning single-quoted > >string > > > >how can i replace the slashes. > > > >thanks > > > >cheers > > > >-- > >Ajay Brar, > >CS Honours 2004 > >Smart Internet Technology Research Group > > > > > > > > > > > >---------------------------------------------------------------- > >This message was sent using IMP, the Internet Messaging Program. > > > > > > ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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EOL - scanning single-quoted string
by Ajay Aug. 4, 2004

Aug. 4, 2004

hi! I am developing an application for a pocket pc. i have a small gui which allows users to select files using a file dialog box. however the file, selected is represented as '/My Documents/test' which when i try to open gives me an error. so what i would like to do is replace '/' by the windows '\' however when i try str='/My Documents/test' re.subn('/', '\', str) i get an error saying - SyntaxError: EOL while scanning single-quoted string how can i replace the slashes. thanks cheers -- Ajay Brar, CS Honours 2004 Smart Internet Technology Research Group ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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Re: tkinter button command
by Christopher T King Aug. 4, 2004

Aug. 4, 2004

On Wed, 4 Aug 2004, Ajay wrote: > if i set two buttons to call the same function when they are pressed, is > there any way, within the function of knowing which button invoked it. Not built-in to Tkinter, but you can easily get such behaviour using lambda like so: >>> from Tkinter import * >>> def click(which): ... print which, 'was clicked!' >>> button1 = Button(text='Button 1',command=lambda: click('number 1')) >>> button2 = Button(text='Button 2',command=lambda: click('number 2')) >>> button1.pack() >>> button2.pack() lambda: will wrap the call to click() up in a function. You can call click() with any arguments this way; instead of strings, you could use integers or a reference to the object itself (though you'd have to set command after creating the button to do this).

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Can somebody help me ?
by patrick.schaeffler＠siemens.com Aug. 4, 2004

Aug. 4, 2004

Hi, I managed to open a msaccess database with python. import win32com.client.dynamic db1 = win32com.client.dynamic.Dispatch("Access.Application") dbname = "D:\\Project\\Database\\database.mdb" db1.OpenCurrentDatabase(dbname) Now, I have the problem, that I don't know how I can read the lines of my table. Can somebody help me please and give me an example code ? I'm looking forward to your answers, and thank u very much in advance. Cheers Patrick

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Re: Subclassing file class
by Michael Hudson Aug. 4, 2004

Aug. 4, 2004

"David Vaughan" <David.Vaughan(a)Gifford.UK.com> writes: > I'm using v2.3, and trying to write to text files, but with a maximum > line length. So, if a line is getting too long, a suitable ' ' > character is replaced by a new line. I'm subclassing the file class, > and, as long as I just use the write method, this works fine. But > "print >>" doesn't behave as I want: You'll almost certainly be happier implementing a 'file-like object' that does what you want than subclassing file. Cheers, mwh -- Every day I send overnight packages filled with rabid weasels to people who use frames for no good reason. -- The Usenet Oracle, Oracularity #1017-1

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tkinter button command
by Ajay Aug. 4, 2004

Aug. 4, 2004

hi! if i set two buttons to call the same function when they are pressed, is there any way, within the function of knowing which button invoked it. cheers -- Ajay Brar, CS Honours 2004 Smart Internet Technology Research Group ---------------------------------------------------------------- This message was sent using IMP, the Internet Messaging Program.

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Re: Crypto.PublicKey.RSA.error: Plaintext too large
by Peter Hansen Aug. 4, 2004

Aug. 4, 2004

Ajay Brar wrote: > the documentation says verify should return true or false. it will > generate an error if plaintext is too large - which is not helping me much > i have pinned the problem down to the signature itself and the way i am > downloading it. > what i do is when a user clicks on a signature link, i calculate the > signature on the fly and then do > print "Content-type: application\n" > print signature > i am using content-type application to force explorer to give the > download dalog box (the application i am building will later be ported > to a pocket pc). Microsoft on their website said to put the header > "Content-disposition: attachment;filename=blah" to force dowload, but > that didn't work - i am yet to find out what i am doing wrong? > so any ideas on how i send the signature across and make the user > download it? Internet Explorer is, of course, broken. The only guaranteed solution of which I'm aware to the problem that it sounds like you are describing (IE refusing to download a file in the right way or to save it as right type) is to set the file extension to something that it recognizes as requiring a download. For example, if you use a file extension of .txt on something, it will generally not try to download it automatically. Same for other things that it recognizes. Setting the extension to .exe would presumably force the same behaviour as using content type "application". Leaving the extension off might also work, though I haven't tried that. Or I might be interpreting what you are saying incorrectly. -Peter

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Subclassing file class
by David Vaughan Aug. 4, 2004

Aug. 4, 2004

I'm using v2.3, and trying to write to text files, but with a maximum line length. So, if a line is getting too long, a suitable ' ' character is replaced by a new line. I'm subclassing the file class, and, as long as I just use the write method, this works fine. But "print >>" doesn't behave as I want: class max_width_file(file): def write(self, txt): print "In max_width_file's write method." fout = max_width_file('foo.txt', 'w') print >> fout, 'bar' fout.close() bypasses my write method and prints 'bar' directly to the file. That isn't the behaviour I inferred from http://docs.python.org/ref/print.html How do I intercept "print >>"? Has anyone already implemented this? And should the documentation be changed? Any help very welcome. David David Vaughan Structural Analyst for Gifford GIFFORD AND PARTNERS LTD Carlton House, Ringwood Road, Woodlands, Southampton, SO40 7HT, UNITED KINGDOM Tel: +44 (0)23 8081 7500 Fax: +44 (0)23 8081 7600 Email: David.Vaughan(a)gifford.uk.com Web: http://www.gifford.uk.com This e-mail and any files transmitted with it are intended solely for the use of the individual or entity to whom they are addressed and may be confidential. If you are not the intended recipient or the person responsible for delivering the e-mail to the intended recipient, be advised that you have received this e-mail in error and that any use, dissemination, forwarding, printing or copying of this e-mail is strictly prohibited.

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Re: converting to string
by Peter Hansen Aug. 4, 2004

Aug. 4, 2004

Gandalf wrote: > Ajay Brar wrote: >> how do i go about converting a Python object or tuple to a string. > > For special cases you can find a more efficient solution.For example, > for tuples of integers, > you can write a C extension that allocates a big string and copies every > int object into 4 bytes > in the string. That would be more efficient. A C extension? You mean like this? : >>> s = (1, 55, 109, 2000, 65535) >>> import struct >>> struct.pack('%si' % len(s), *s) '\x01\x00\x00\x007\x00\x00\x00m\x00\x00\x00\xd0\x07\x00\x00\xff\xff\x00\x00' <wink> -Peter

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syntax-check with regular expressions?
by spamnews＠gmx.de Aug. 4, 2004

Aug. 4, 2004

Hi, I would like to check if a string contains a valid date format (Format: "dd.mm.yyyy") or not. What is the best way to do this. regexp? At the moment it would be sufficient to check for [digit][digit].[digit][digit].[digit][digit][digit][digit] but a full date verification (Month in range 1-12 ...) would be very nice too. Sample code would help me very much. regards Detlef PS: I'm a python newbie, so excuse this silly question

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