On Jul 28, 4:20 pm, "Guilherme Polo" <[EMAIL PROTECTED]> wrote: > On Mon, Jul 28, 2008 at 8:04 PM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > On Jul 28, 3:52 pm, "Guilherme Polo" <[EMAIL PROTECTED]> wrote: > >> On Mon, Jul 28, 2008 at 7:43 PM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> > >> wrote: > >> > On Jul 28, 3:33 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > >> >> On Jul 28, 3:29 pm, "Diez B. Roggisch" <[EMAIL PROTECTED]> wrote: > > >> >> > [EMAIL PROTECTED] schrieb: > > >> >> > > On Jul 28, 3:00 pm, "[EMAIL PROTECTED]" <[EMAIL PROTECTED]> wrote: > >> >> > >> Hi - experienced programmer but this is my first Python program. > > >> >> > >> This URL will retrieve an excel spreadsheet containing (that day's) > >> >> > >> msci stock index returns. > > >> >> > >>http://www.mscibarra.com/webapp/indexperf/excel?priceLevel=0&scope=0&;... > > >> >> > >> Want to write python to download and save the file. > > >> >> > >> So far I've arrived at this: > > >> >> > >> [quote] > >> >> > >> # import pdb > >> >> > >> import urllib2 > >> >> > >> from win32com.client import Dispatch > > >> >> > >> xlApp = Dispatch("Excel.Application") > > >> >> > >> # test 1 > >> >> > >> # xlApp.Workbooks.Add() > >> >> > >> # xlApp.ActiveSheet.Cells(1,1).Value = 'A' > >> >> > >> # xlApp.ActiveWorkbook.ActiveSheet.Cells(2,1).Value = 'B' > >> >> > >> # xlBook = xlApp.ActiveWorkbook > >> >> > >> # xlBook.SaveAs(Filename='C:\\test.xls') > > >> >> > >> # pdb.set_trace() > >> >> > >> response = > >> >> > >> urllib2.urlopen('http://www.mscibarra.com/webapp/indexperf/ > >> >> > >> excel? > >> >> > >> priceLevel=0&scope=0¤cy=15&style=C&size=36&market=1897&asOf=Jul > >> >> > >> +25%2C+2008&export=Excel_IEIPerfRegional') > >> >> > >> # test 2 - returns check = False > >> >> > >> check_for_data = urllib2.Request('http://www.mscibarra.com/webapp/ > >> >> > >> indexperf/excel? > >> >> > >> priceLevel=0&scope=0¤cy=15&style=C&size=36&market=1897&asOf=Jul > >> >> > >> +25%2C+2008&export=Excel_IEIPerfRegional').has_data() > > >> >> > >> xlApp = response.fp > >> >> > >> print(response.fp.name) > >> >> > >> print(xlApp.name) > >> >> > >> xlApp.write > >> >> > >> xlApp.Close > >> >> > >> [/quote] > > >> >> > > Woops hit Send when I wanted Preview. Looks like the html [quote] > >> >> > > tag > >> >> > > doesn't work from groups.google.com (nice). > > >> >> > > Anway, in test 1 above, I determined how to instantiate an excel > >> >> > > object; put some stuff in it; then save to disk. > > >> >> > > So, in theory, I'm retrieving my excel spreadsheet with > > >> >> > > response = urllib2.urlopen() > > >> >> > > Except what then do I do with this? > > >> >> > > Well for one read some of the urllib2 documentation and found the > >> >> > > Request class with the method has_data() on it. It returns False. > >> >> > > Hmm that's not encouraging. > > >> >> > > I supposed the trick to understand what urllib2.urlopen is returning > >> >> > > to me; rummage around in there; and hopefully find my excel file. > > >> >> > > I use pdb to debug. This is interesting: > > >> >> > > (Pdb) dir(response) > >> >> > > ['__doc__', '__init__', '__iter__', '__module__', '__repr__', > >> >> > > 'close', > >> >> > > 'code', ' > >> >> > > fileno', 'fp', 'geturl', 'headers', 'info', 'msg', 'next', 'read', > >> >> > > 'readline', ' > >> >> > > readlines', 'url'] > >> >> > > (Pdb) > > >> >> > > I suppose the members with __*_ are methods; and the names without > >> >> > > the > >> >> > > underbars are attributes (variables) (?). > > >> >> > No, these are the names of all attributes and methods. read is a > >> >> > method, > >> >> > for example. > > >> >> right - I got it backwards. > > >> >> > > Or maybe this isn't at all the right direction to take (maybe there > >> >> > > are much better modules to do this stuff). Would be happy to learn > >> >> > > if > >> >> > > that's the case (and if that gets the job done for me). > > >> >> > The docs (http://docs.python.org/lib/module-urllib2.html) are pretty > >> >> > clear on this: > > >> >> > """ > >> >> > This function returns a file-like object with two additional methods: > >> >> > """ > > >> >> > And then for file-like objects: > > >> >> >http://docs.python.org/lib/bltin-file-objects.html > > >> >> > """ > >> >> > read( [size]) > >> >> > Read at most size bytes from the file (less if the read hits EOF > >> >> > before obtaining size bytes). If the size argument is negative or > >> >> > omitted, read all data until EOF is reached. The bytes are returned > >> >> > as a > >> >> > string object. An empty string is returned when EOF is encountered > >> >> > immediately. (For certain files, like ttys, it makes sense to continue > >> >> > reading after an EOF is hit.) Note that this method may call the > >> >> > underlying C function fread() more than once in an effort to acquire > >> >> > as > >> >> > close to size bytes as possible. Also note that when in non-blocking > >> >> > mode, less data than what was requested may be returned, even if no > >> >> > size > >> >> > parameter was given. > >> >> > """ > > >> >> > Diez > > >> >> Just stumbled upon .read: > > >> >> response = urllib2.urlopen('http://www.mscibarra.com/webapp/indexperf/ > >> >> excel? > >> >> priceLevel=0&scope=0¤cy=15&style=C&size=36&market=1897&asOf=Jul > >> >> +25%2C+2008&export=Excel_IEIPerfRegional').read > > >> >> Now the question is: what to do with this? I'll look at the > >> >> documentation that you point to. > > >> >> thanx - pat > > >> > Or rather (next iteration): > > >> > response = urllib2.urlopen('http://www.mscibarra.com/webapp/indexperf/ > >> > excel? > >> > priceLevel=0&scope=0¤cy=15&style=C&size=36&market=1897&asOf=Jul > >> > +25%2C+2008&export=Excel_IEIPerfRegional').read(1000000) > > >> > The file is generally something like 26 KB so specifying 1,000,000 > >> > seems like a good idea (first approximation). > > >> > And then when I do: > > >> > print(response) > > >> > I get a whole lot of garbage (and some non-garbage), so I know I'm > >> > onto something. > > >> > When I read the .read documentation further, it says that read() has > >> > returned the data as a string object. Now - how do I convince Python > >> > that the string object is in fact an excel file - and save it to disk? > > >> You don't need to convince Python, just write it to a file. > >> More reading for you:http://docs.python.org/tut/node9.html > > >> > pat > >> > -- > >> >http://mail.python.org/mailman/listinfo/python-list > > >> -- > >> -- Guilherme H. Polo Goncalves > > > OK: > > > response = urllib2.urlopen('http://www.mscibarra.com/webapp/indexperf/ > > excel? > > priceLevel=0&scope=0¤cy=15&style=C&size=36&market=1897&asOf=Jul > > +25%2C+2008&export=Excel_IEIPerfRegional').read(1000000) > > # print(response) > > f = open("c:\\msci.xls",'w') > > f.write(response) > > I would initially change that to: > > response = > urllib2.urlopen('http://www.mscibarra.com/webapp/indexperf/excel?priceLevel=0&scope=0&;...) > > f = open("c:\\msci.xls", "wb") > for line in response: > f.write(line) > f.close() > > and then.. > > > > > OK this makes the file, and there's a c:\msci.xls in place and it's > > about the right size. But whether I make the second param to open 'w' > > or 'wb', when I try to open msci.xls from the Windows file explorer, > > excel tells me that the file is corrupted. > > try it. > > > > > pat > > -- > >http://mail.python.org/mailman/listinfo/python-list > > -- > -- Guilherme H. Polo Goncalves
A simple f.write(response) does work (click on a single row in Excel and you get a single row). But I can see that what you recommend Guilherme is probably safer - thanx. pat -- http://mail.python.org/mailman/listinfo/python-list
