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AIX installation can't find zlib
by Larry Whitley Nov. 3, 2011

Nov. 3, 2011

I've just installed the 1.5.2 source distribution on an AIX system and when I say "import zlib" it responds: >>> import zlib Traceback (innermost last): File "<stdin>", line 1, in ? ImportError: No module named zlib >>> I'm not sure where zlib is supposed to be. It's not in the Lib subdirectory of Python-1.5.2. In the Modules subdirectory I find zlibmodule.c. Nothing germaine in the Objects subdirectory. Looked at config.log and config.status, no mention of zlib. Looking at the sys.path I see: .../ldw/Python-1.5.2> python Python 1.5.2 (#1, Jul 26 2000, 14:21:56) [C] on aix4 Copyright 1991-1995 Stichting Mathematisch Centrum, Amsterdam >>> import sys >>> sys.path ['', '/.../rchland.ibm.com/fs/u1/ldw/Projects/Programs/wtCache', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/plat-aix4', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Lib/lib-tk', '/.../rchland.ibm.com/fs/u1/ldw/Python-1.5.2/Modules'] >>> Any suggestions? Larry

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socket.inet_ntop, and pton question
by Andrew Aug. 5, 2009

Aug. 5, 2009

Hi Are these functions (inet_ntop(), inet_pton()) from the socket library supported on Windows. If not is there an equivalent for them using Windows Ive seen mention of people creating their own in order to use them Appreciate the help ty

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Unable to abort a FTP command?
by _wdx＠163.com April 15, 2009

April 15, 2009

Hi, I write the following script to retrieve a part of a large file from a FTP site: import ftplib class ftp_getter(object): def __init__(self): self.handle = ftplib.FTP('ftp_server_address') self.handle.set_debuglevel(2) self.login() def login(self): self.handle.login('user', 'pass') self.handle.cwd('/temp1/') def quit(self, is_close = False): self.handle.quit() if is_close: self.handle.close() print 'ftp handle closed' def getpart_callback(self, received): print "received a packet" if self.cnt <= 0: if not self.outf.closed: self.outf.close() if not self.aborted: try: self.handle.abort() self.aborted = True except Exception,ex: pass else: print 'received packet, [0] = %x' % ord(received[0]) self.outf.write(received) self.cnt -= len(received) def getpart(self, ftp_filename, rest, cnt, out_filename): self.outf = open(out_filename, 'wb') self.cnt = cnt self.aborted = False self.handle.retrbinary('RETR ' + ftp_filename, self.getpart_callback, 8192, rest) if not self.outf.closed: self.outf.close() if __name__ == '__main__': g = ftp_getter() g.getpart('FILE_TO_RETRIEVE.DAT', 50000, 20, 'out.dat') g.quit(True) print "all done." As the last four lines shown, I want to connect to my FTP server, retrieve 20 bytes starting at offset 50000 from FILE_TO_RETRIEVE.DAT, and stop retrieving after more than 20 bytes have been received. It's quite simple, but to my suprise, this code does not work. "self.handle.abort()" have been executed and I got the expected response from server(426), but the RETR command does not seem to stop at all. More and more data are received and getpart_callback method is called again and again. Why the RETR command is not actually aborted? Can anyone help me? Thanks Xu Wang

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decorators tutorials
by james_027 March 23, 2009

March 23, 2009

Hi, I am learning python by learning django, and I stumble upon decorator which is very cool, any beginners resources for python decorators, although I can google it, I just want to get a good tutorial for this topic. Thanks james

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Re: Implementaion of random.shuffle
by Hrvoje Niksic Feb. 20, 2009

Feb. 20, 2009

Steve Holden <steve(a)holdenweb.com> writes: > So it would appear that the developers chose the Knuth algorithm > (with a slight variation) for *their* implementation. Now you have > to ask yourself whether your surmise is genuinely correct (in which > case the documentation may contain a bug) or whether the > documentation is indeed correct and you are in error. That is a good question. The random module uses the Mersenne twister, which has a repetition period of 2**19937. The number of n-sized permutations of a list with n elements is n!, while each shuffle requires n calls to the PRNG. This means that to be able to generate all permutations, the PRNG must have a period of at least n! * n. In the case of MT, it means that, regarding the period, you are safe for lists with around 2079 elements. shuffle's documentation may have been written before the random module was converted to use the MT. 2**19937 being a really huge number, it's impossible to exhaust the Mersenne twister by running it in sequence. However, there is also the question of the spread of the first shuffle. Ideally we'd want any shuffle, including the first one, to be able to produce any of the n! permutations. To achieve that, the initial state of the PRNG must be able to support at least n! different outcomes, which means that the PRNG must be seeded by at least log2(n!) bits of randomness from an outside source. For reference, Linux's /dev/random stops blocking when 64 bits of randomness are available from the entropy pool, which means that, in the worst case, shuffling more than 20 elements cannot represent all permutations in the first shuffle!

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Module for creating a screenshot of a web page given a URL?
by dananrg＠yahoo.com Oct. 23, 2008

Oct. 23, 2008

Is there a Python module that, given a URL, will grab a screenshot of the web page it goes to? I'd like to be able to feed such a module a list of URLs from a file. Thanks very much.

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Snapshot+Clipboard
by Yves Lange Oct. 23, 2008

Oct. 23, 2008

Hello, i'm searching a method to take a snapshot and save it in a jpg, bmp or gif file. I tried with win32api and win32con but it save the snapshot to the clipboard, so i tried to redirect this in a file but i have some problems while getting the IMAGE stocked in the clipboard and save it to a file. Can somebody help me ? Questions: -How can i read the snapshot in the clipboard ? -How can i take a snapshot in a different way (less difficult) ? Thks.

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From D
by bearophileHUGS＠lycos.com Sept. 8, 2008

Sept. 8, 2008

There are various things I like about the D language that I think Python too may enjoy. Here are few bits (mostly syntactical ones): 1) (we have discussed part of this in the past) You can put underscores inside number literals, like 1_000_000, the compiler doesn't enforce the position of such underscores, so you can also put them like this: 1_00_000. You can put them in literals of decimals, binary, hex, etc. I think it's quite useful, because when in Python code I have a line like: for i in xrange(1000000): I need some time to count the zeros, because the lower levels of my visual systems can't count/group them quickly (perceptually). While in a syntax like: for i in xrange(1_000_000): my eyes help me group them at once. 2) Base 2 number literals, and base 2 "%b" printing with the writefln. Base-2 numbers are less common in Python code, but once in a while I use them. For example: import std.stdio; void main() { auto x = 0b0100_0011; writefln("%b", x); writefln("%.8b", x); writefln(x); } Prints: 1000011 01000011 67 3) All string literals are multi line. So you can write: a = "how are you"; There's no need for """ """. 4) With D I have created an xsplit() generator, and from my tests it's quite faster than the split(), expecially if the string/lines you want to split are few hundred chars long or more (it's not faster if you want to split very little strings). So I think Python can enjoy such string method too (you can probably simulate an xsplit with a regular expression, but the same is true for some other string methods too). Bye, bearophile

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Building a Python app with Mozilla
by Thorsten Kampe July 14, 2008

July 14, 2008

Hi, I've already sent this to the Komodo mailing list (which seemed to me the more appropriate place) but unfortunately I got no response. I'd like to build a Python GUI app. Neither Tkinter nor Wxpython nor PyQT are actually what I want (because the lack of GUI builders and they don't really look good on Windows and Linux). Komodo itself is an excellent example of a - at least Python driven - application that looks superb and has superior functionality so it seems natural to use the Komodo approach for me. Some questions * Is there a simple How-To how to build a very simple (Python) app with the Mozilla framework? Kind of "Hello world"...? * Is is reasonable to think that building a GUI with Mozilla is easier than using Python frameworks because Mozilla does most of the GUI work? Thorsten

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Problem with PEXPECT in Python
by Kevin Erickson June 4, 2008

June 4, 2008

Hello, I am attempting to use pexpect in python to copy files from a server using scp; the copy works however exceptions are thrown and it exits unsuccessfully. Below is the a sample code and the error: #Begin Code import sys import pexpect def GetServerData(self): foo = pexpect.spawn('scp user@server.com:/home/config/ role{/file1,/files/file2,/files/file3} /tmp') foo.expect('.*password:*') foo.sendline('server_password') foo.interact() #End Code #Begin Output file1 100% 10KB 10.0KB/s 00:01 file2 100% 946 0.9KB/s 00:00 file3 100% 1655 1.6KB/s 00:00 Traceback (most recent call last): File "mygui.py", line 6, in ? f = Form1() File "/home/Kevin/form1.py", line 41, in __init__ self.GetServerData() File "/home/Kevin/form1.py", line 84, in GetServerData foo.interact() File "/usr/lib/python2.4/site-packages/pexpect.py", line 1062, in interact selfw.__interact_copy(escape_character) File "/usr/lib/python2.4/site-packages/pexpect.py", line 1086, in __interact_copy data = self.__interact_read(self.child_fd) File "/usr/lib/python2.4/site-packages/pexpect.py", line 1075, in __interact_read return os.read(fd, 1000) OSError: [Errno 5] Input/output error #End Output The problem seems to be with the call foo.interact(); does anyone know how to fix this? Any help will be much appreciated.

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