🌐 Mailman 3 May 2013 - Python-list - python.org

Best programs written completly in Python
by Franz Steinh�usler Feb. 12, 2016

Feb. 12, 2016

Hello NG, wWhat are the best programs in your opinion, written entirly in pyhton, divided into categories like: a) Games b) Utilities/System c) Office d) Web/Newsreader/Mail/Browser ... I don't want to start a long thread, if a site of such an discussion already exists, a link will be enough. Many thanks in advance! -- Franz Steinhaeusler

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Re: How clean/elegant is Python's syntax?
by rusi Jan. 22, 2016

Jan. 22, 2016

On Thu, May 30, 2013 at 9:34 AM, Ma Xiaojun <damage3025(a)gmail.com> wrote: > > On Thu, May 30, 2013 at 10:49 AM, rusi <rustompmody(a)gmail.com> wrote: > > Ha,Ha! The join method is one of the (for me) ugly features of python. > > You can sweep it under the carpet with a one-line join function and > > then write clean and pretty code: > > > > #joinwith > > def joinw(l,sep): return sep.join(l) > > > > def mktable(m,n): > > return [[(j,i,i*j) for i in range(1,m+1)] for j in range(1,n+1)] > > > > def prettyrow(r): > > return joinw(['%d*%d=%d' % ele for ele in r],'\t') > > > > def prettytable(t): > > return joinw([prettyrow(r) for r in t],'\n') > > Wait a minute! Isn't the most nature way of doing/thinking "generating > 9x9 multiplication table" two nested loop? Thats like saying that the most natur(al) way of using a car is to attach a horse to it. Sure if all you've seen are horse-carriages then a horseless carriage will seem nonsensical. Once you get used to horseless carriages the horsed ones would seem quite a nuisance [global warming aside!!] The only problem with this analogy is that you have to imagine the world of horse/horseless 'cars' in 1900 and not 2013. Likewise in the world of programming, 90% of programmers think imperative/OO programming is natural while functional programming is strange. Just wait 10 years and see if things are not drastically different! > > I understand that using "join", we don't need to worry about "one > element doesn't need white space" issue. And that's it. More evidence of the above! join like list-comprehensions are tools for functional programming and not merely ways of writing loops in short. The key difference between the two is seen not in the code you write but in the natural language (English) you use to describe it: > Wait a minute! Isn't the most nature way of doing/thinking "generating > 9x9 multiplication table" two nested loop? You associate the primal (f)act of thinking about programming with *doing* the generating. By contrast the functional programmer thinks about what *is* the result. Please also note the difference in emphasis in your code and mine. Rewriting to make it more obvious: # The main multiplication table building function def multtable(m,n): return [[(j,i,i*j) for i in range(1,m+1)] for j in range(1,n+1)] # The 'icing' to get it into the shape you want def joinw(l,sep): return sep.join(l) def prettytable(t): return joinw([joinw(['%d*%d=%d' % ele for ele in r],'\t') for r in t],'\n') The call that puts them together: >>> print prettytable(multtable(6,7)) The nice thing about the last is that it separates three things: 1. Computing the actual table 2. The string form of that table that looks the way we want 3. Printing that string And I can see each of these separately: In [2]: multtable(2,3) Out[2]: [[(1, 1, 1), (1, 2, 2)], [(2, 1, 2), (2, 2, 4)], [(3, 1, 3), (3, 2, 6)]] In [3]: prettytable(_) Out[3]: '1*1=1\t1*2=2\n2*1=2\t2*2=4\n3*1=3\t3*2=6' In [4]: print _ 1*1=1 1*2=2 2*1=2 2*2=4 3*1=3 3*2=6 ------------------- I would be pleasantly surprised if the double nested loop you think natural, allowed for such a modular separation!

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TypeError: 'float' object is not iterable
by Ana Dionísio Dec. 16, 2015

Dec. 16, 2015

Hi!! I keep having this error and I don't know why: TypeError: 'float' object is not iterable. I have this piece of code, that imports to python some data from Excel and saves it in a list: " t_amb = [] for i in range(sh2.nrows): t_amb.append(sh2.cell(i,2).value) print t_amb " Here is everything ok. But then, I need to pass the data again to exel, so I wrote this: " a=8 for b in range (len(t_amb)): a=8 for d in t_amb[b]: a=a+1 sheet.write(a,b+1,d) " The error appear in "for d in t_amb[b]:" and I don't understand why. Can you help me?

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Script to extract text from PDF files
by brad Nov. 7, 2015

Nov. 7, 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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Determining version of OpenSSL linked against python?
by Adam Mercer Sept. 18, 2015

Sept. 18, 2015

Hi I'm trying to write a script that determines the version of OpenSSL that python is linked against, using python-2.7 this is easy as I can use: import ssl ssl.OPENSSL_VERSION but unfortunately I need to support python-2.6, from an older script I used the following: import _ssl ssl_lib = _ssl.__file__ to get the path to the _ssl.so module and then I parsed the output of ldd (on linux) to get the path to the OpenSSL library and then parsed the version from the filename. In other words it's very messy. I had a little success using this approach but I have recently received a bug report that this doesn't seem to work on Debian Squeeze. When I try to query the __file__ attribute of the _ssl module I get the following error: >>> import _ssl >>> _ssl.__file__ Traceback (most recent call last): File "<stdin>", line 1, in <module> AttributeError: 'module' object has no attribute '__file__' >>> Can anyone offer any suggestions as to what is going wrong with the above code or offer an alternative way of determining the OpenSSl version using python-2.6? Cheers Adam

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Einstein's Riddle
by Steve Graham Sept. 18, 2015

Sept. 18, 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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Re: ctypes for AIX
by Anssi Saari July 29, 2015

July 29, 2015

"Waddle, Jim" <jim.waddle(a)boeing.com> writes: > I do not have sufficient knowledge to know how to fix this. I would think that this error somehow is related to compiling on aix. If you have any suggestions on how to correct this problem , I would appreciate it I'd have to guess your main problem is not using gcc to compile. From a quick look, that's what the guys at the pware site did.

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Re: Message passing syntax for objects | OOPv2
by Steven D'Aprano June 2, 2015

June 2, 2015

On Wed, 08 May 2013 19:35:58 -0700, Mark Janssen wrote: > Long story short: the lambda > calculus folks have to split from the Turing machine folks. > These models of computation should not use the same language. Their > computation models are too radically different. Their computation models are exactly equivalent. This is like saying that Cartesian coordinates and polar coordinates are so radically different that they cannot possibly both describe the same space. -- Steven

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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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