🌐 Mailman 3 November 2010 - Python-list - python.org

Script to extract text from PDF files
by brad Nov. 6, 2015

Nov. 6, 2015

I have a very crude Python script that extracts text from some (and I emphasize some) PDF documents. On many PDF docs, I cannot extract text, but this is because I'm doing something wrong. The PDF spec is large and complex and there are various ways in which to store and encode text. I wanted to post here and ask if anyone is interested in helping make the script better which means it should accurately extract text from most any pdf file... not just some. I know the topic of reading/extracting the text from a PDF document natively in Python comes up every now and then on comp.lang.python... I've posted about it in the past myself. After searching for other solutions, I've resorted to attempting this on my own in my spare time. Using apps external to Python (pdftotext, etc.) is not really an option for me. If someone knows of a free native Python app that does this now, let me know and I'll use that instead! So, if other more experienced programmer are interested in helping make the script better, please let me know. I can host a website and the latest revision and do all of the grunt work. Thanks, Brad

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Einstein's Riddle
by Steve Graham Sept. 17, 2015

Sept. 17, 2015

Who would be interested in using his/her brain (and his computer) to solve the following? Steve Graham === Einstein's Riddle Albert Einstein wrote this riddle this century [ed. 20th century]. He said 98% of the world could not solve it. There are 5 houses in 5 different colors. In each house lives a person with a different nationality. The 5 owners drink a certain type of beverage, smoke a certain brand of cigar, and keep a certain pet. No owners have the same pet, smoke the same brand of cigar or drink the same beverage. The question is: "Who owns the fish?" Hints: The Brit lives in the red house. The Sweed keeps dogs as pets. The Dane drinks tea. The green house is on the left of the white house. The green house's owner drinks coffee. The person who smokes Pall Mall rears birds. The owner of the yellow house smokes Dunhill. The man living in the center house drinks milk. The Norwegian lives in the first house. The man who smokes Blends lives next to the one who keeps cats. The man who keeps the horse lives next to the man who smokes Dunhill. The owner who smokes Bluemasters drinks beer. The German smokes Prince. The Norwegian lives next to the blue house. The man who smokes Blends has a neighbor who drinks water.

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Confessions of a Python fanboy
by r May 11, 2015

May 11, 2015

Hello fellow Pythonista's it's nice to be back after such a long hiatus. I have recently realized my blind love affair with Python was just that. I must admit there are better ways to program. Like your first lay, your first programing language can leave an indelible mark on you, but like all young chaps, the passion for programming has sweep me away into vast new orgies of programming bliss. (ig ,little head guides the big one.) My adventures in Ruby. an autobyography by rt8396 After breaking free from the wild love affair i had with Python, a new day had dawned. I dried my eyes and soon discovered the Ruby language (not by choice however) --now don't worry fellow Pythonistas, i am still on your side (mostly) -- but i now realize Ruby has some good things going for it. For instance... 1.) No need to use "()" to call a function with no arguments. Python --> "obj.m2().m3()" --ugly Ruby --> "obj.m1.m2.m3" -- sweeet! Man, i must admit i really like this, and your code will look so much cleaner. 2.) the .each method container.each{|localVar| block} This method can really cleanup some ugly for loops, although i really like the readability of for loops. 3.) true OOP Now before you go and get all "huffy" over this statement, hear me out. Python is the best language in the world. But it damn sure has some warts! "len(this)" instead of "obj.length" max(that) instead of [1,2,3,4,5].max(). You know what i am talking about here people. We all get complacent and It seems easier to just cope with these problems instead of fighting for change. But look at the French, WHAT THE HELL HAS THAT DONE FOR THEM, *NOTHING*!!!! As for the rest of Ruby, i am not impressed. The redundant usage of "end" over indention perplexes me. The Perlish feel of "require" and the horrifically cryptic idioms of Ruby regular expressions. The "puts" and "gets" seem childish and the math class does not even have a degrees or radians function! Anyway, i thought i would get this off my chest and catch up with old friends in the meantime. We can all make Python the perfect language it needs to be, but it ain't gonna be easy! Thank you all PS stay tuned for more from this series....

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How to receive a data file of unknown length using a python socket?
by twgray April 22, 2015

April 22, 2015

I am attempting to send a jpeg image file created on an embedded device over a wifi socket to a Python client running on a Linux pc (Ubuntu). All works well, except I don't know, on the pc client side, what the file size is? The following is a snippet: [code] f = open("frame.jpg",mode = 'wb') while True: data = self.s.recv(MAXPACKETLEN) if len(data) == 0: break recvd += len(data) f.write(data) f.close() [end] It appears to be locking up in 'data=self.s.recv(MAXPACKETLEN)' on the final packet, which will always be less than MAXPACKETLEN. I guess my question is, how do I detect end of data on the client side?

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Python to C++ in a pickle
by Larry Whitley April 2, 2015

April 2, 2015

I'd like to pickle an object in python and unpickle it in C++. The object in question is a python dictionary so it will have to go into a C++ map. Has someone done this and is willing to share? Or, is the cPickle source available on the web somewhere? Larry

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Re: feature request: a better str.endswith
by Irmen de Jong Feb. 17, 2015

Feb. 17, 2015

Jp Calderone wrote: > On Fri, Jul 18, 2003 at 05:01:47AM -0700, Michele Simionato wrote: > >>I often feel the need to extend the string method ".endswith" to tuple >>arguments, in such a way to automatically check for multiple endings. >>For instance, here is a typical use case: >> >>if filename.endswith(('.jpg','.jpeg','.gif','.png')): >> print "This is a valid image file" >> >>Currently this is not valid Python and I must use the ugly >> >>if filename.endswith('.jpg') or filename.endswith('.jpeg') \ >> or filename.endswith('.gif') or filename.endswith('.png'): >> print "This is a valid image file" > > > extensions = ('.jpg', '.jpeg', '.gif', '.png') > if filter(filename.endswith, extensions): > print "This is a valid image file > > Jp > Using filter Michele's original statement becomes: if filter(filename.endswith, ('.jpg','.jpeg','.gif','.png')): print "This is a valid image file" IMHO this is simple enough to not require a change to the .endswith method... --Irmen

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Re: drawing with the mouse with turtle
by Steven D'Aprano Feb. 10, 2015

Feb. 10, 2015

On Fri, 12 Nov 2010 19:24:50 -0500, Brian Blais wrote: > I'd like to draw on a turtle canvas, but use the mouse to direct the > turtle. I don't see a good way of getting the mouse coordinates and the > button state. I think the right way to do that is by creating an event handler to the turtle. These docs are for Python 2.7 turtle, but they may be applicable to older versions as well: http://docs.python.org/library/turtle.html#turtle.ondrag I quote: >>> turtle.ondrag(turtle.goto) Subsequently, clicking and dragging the Turtle will move it across the screen thereby producing handdrawings (if pen is down). That's probably all you need to do. -- Steven

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Python Tk Tix GUI documentation & builder overview and tips
by baloand＠googlemail.com Jan. 3, 2015

Jan. 3, 2015

I have recently started development for a small video conversion project using a GUI. After some research I decided to use Tkinter/Tix (Tk/Tix). The reasons are mainly: 1. the GUI is rather simple, and 2. the end-user is not necessarily technically inclined so I want to keep a) required libraries as few as possible, and b) installation as painless as possible. 3. Tk/Tix is included with Python. Thus only a Python installation is needed. Nothing else. 4. Tk itsself misses some rudimentary widgets like meters, multi/colum lists, grid and scrolled widgets. Tix provides those. Good enough for my little application (more advanced and more modern widgets are available in frameworks like Qt, Gtk, or wxWindows). Before starting I spent some effort to find a) relevant documentation, b) GUI Builders which might help me, c) answers to non-obvious questions. The process took some time and effort so I want to share my findings: a) Documentation resources Python Docs http://docs.python.org/library/tkinter.html Tk Commands http://www.tcl.tk/man/tcl8.5/TkCmd/contents.htm Tix Reference http://tix.sourceforge.net/man/html/contents.htm Tix demo application You want to extract the Tix demo application coming with the Tix 8.4.3 source distribution. It contains examples for many widgets - unfortunately none for multi-column HList or the Grid (see below). https://sourceforge.net/project/showfiles.php?group_id=5649&package_id=5704 Tix8.4.3-src.tar.gz, then look in /Tix8.4.3/Python/Demo/tix Thinking in Tkinter I recommend the "Individual programs online" http://www.ferg.org/thinking_in_tkinter/index.html b) GUI development tools ActiveState GUI Builder (using grid layout) SpecTcl is the predecessor of GUI Builder (by ActivaState). http://spectcl.sourceforge.net/ FAQ (where to get source) http://aspn.activestate.com/ASPN/Mail/Message/komodo-announce/3355346 PAGE v3.0 by Stewart Allen (using placer layout) http://page.sourceforge.net/ There are many more for other GUI toolkits mentioned in this post: http://mail.python.org/pipermail/python-list/2004-February/250727.html Finally I decided to use the packer layout and create the widgets manually. Just the simplest and quickest way for me. c) How do I ...? How do I use all methods available in the Tix Grid? Tix Grid with full implementation of all methods http://klappnase.bubble.org/TixGrid/index.html How do I create a multi-column Tix.HList? import Tkinter as Tk import Tix root = Tix.Tk() # setup HList hl = Tix.HList(root, columns = 5, header = True) hl.header_create(0, text = "File") hl.header_create(1, text = "Date") hl.header_create(1, text = "Size") # create a multi-column row hl.add("row1", text = "filename.txt") hl.item_create(entry_path, 1, text = "2009-03-26 21:07:03") hl.item_create(entry_path, 2, text = "200MiB") I haven't found out how to right-justify individual columns? Anyone? How to implement Tk GUI with multiple threads? Usually there are two options to make threads wait for an event: * gui thread polling (lame) see here how to use Tk.after() (actually a Tcl command) to poll http://uucode.com/texts/pylongopgui/pyguiapp.html see here how to imitate the Tk event loop to poll for non-Tk events (a socket, for example) https://sourceforge.net/project/showfiles.php?group_id=5649&package_id=5704 Tix8.4.3-src.tar.gz, then look in /Tix8.4.3/Python/Demo/tix/ tixwidgets.py, find loop() * multithreaded with events (the option to choose) Basically this uses bind and event_generate to send "Notify" messages to the Tk instance. I suspect the following example failed due to not synchronising the event_generate call http://coding.derkeiler.com/Archive/Python/comp.lang.python/2006-07/msg0147… For multithreading Python Tk GUI applications the following rules apply: 1. same thread calling Tk must do all subsequent GUI calls, 2. other threads may send events with send_event to the root Tk instance, 3. with threading problems you might try to synchonise access to event_generate(). Using event_generate() with one non-GUI thread seems to be safe.

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Creating interactive command-line Python app?
by planetthoughtful Dec. 18, 2014

Dec. 18, 2014

Hello All, Newbie to Python, and I'm wondering if it's possible to create a Python console app that prompts for further input on the command line when run (in Windows XP, if that's important)? I've tried Googling, but the results are overwhelmingly about interactive Python environments (IPython etc etc), instead of how to achieve prompting at the command line when running your own Python app. Any help appreciated! Much warmth, planetthoughtful

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