🌐 Mailman 3 July 2007 - Python-list - python.org

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July 27, 2007

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Re: Comparing Dictionaries
by Ben Finney July 27, 2007

July 27, 2007

Kenneth Love <klove(a)tax.ok.gov> writes: > In other words, I consider these two dictionaries to be equivalent: > > { 'dog' : 'bone', 'cat' : 'fever', 'mouse' : 'mickey' } > { 'mouse' : 'mickey', 'dog' : 'bone', 'cat' : 'fever' } > > while these two are not: > > { 'dog' : 'bone', 'cat' : 'fever', 'mouse' : 'mickey' } > { 'dog' : 'bone', 'cat' : 'fever', 'mouse' : 'michael' } > > Any suggestions on how to compare these via some assert statement? Dictionaries already know how to compare themselves to each other. >>> {'dog': 'bone', 'cat': 'fever', 'mouse': 'mickey'} == {'mouse': 'mickey', 'dog': 'bone', 'cat': 'fever'} True >>> {'dog': 'bone', 'cat': 'fever', 'mouse': 'mickey'} == {'mouse': 'michael', 'dog': 'bone', 'cat': 'fever'} False -- \ "Many are stubborn in pursuit of the path they have chosen, few | `\ in pursuit of the goal." -- Friedrich Nietzsche | _o__) | Ben Finney

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Re: Comparing Dictionaries
by Ali July 27, 2007

July 27, 2007

On Jul 26, 10:18 pm, Kenneth Love <kl...(a)tax.ok.gov> wrote: > Hello, > > I am new to Python, but not programming. I would like to start my > Python career by developing programs according to the "best practices" > of the industry. Right now, that appears to be unit tests, patterns, > and source code control. I am not sure about "best", but one of my "favourite practices" is to not re-write code that other people have written, and have released under licenses that allow you to do anything with it. > So, I am trying to write a unit test for some code that reads a Windows > style INI file and stores the section, key, and values in a dictionary So, in the standard library: http://docs.python.org/lib/module-ConfigParser.html And if you want a more involved approach: http://www.voidspace.org.uk/python/configobj.html Ali

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Re: a simple string question
by vedrandekovic＠v-programs.com July 27, 2007

July 27, 2007

On 27 srp, 19:29, Wildemar Wildenburger <wilde...(a)freakmail.de> wrote: > vedrandeko...(a)v-programs.com wrote: > > I have one question about string.I am trying to make an function to > > analyze line of some text, this is my example: "HELLO;HELLO2:WORLD:", > > if that function in this text find ";" and ":" ( in this example will > > find both) > > > e.g that function must return this: > > > "HELLO;\nHELLO2:\n\t\t\t\t\t\t\tWORLD:" > > If I understand you correctly you want to replace ";" by ";\n" and ":" > by ":\n\t\t\t\t\t\t\t". > Well guess what? The replace() method does just this. Have a read: > <URL:http://docs.python.org/lib/string-methods.html> > > /W Hello, No,that's not what I need... When this function detect ";" or ":" ,it must append character "\n" or "\n\t" ahead ":" or ";" another e.g 1) text="Hello world;Hello:Hello2" 2) When function detect ";" or ":" it must append character "\n" or "\n \t" ahead ":" or ";", so that must look like this: NEW TEXT : "Hello world;\nHello:\n\t\t\n\n\n\n\n\nHello2" Regards, Vedran

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Why is "for line in f" faster than readline()
by Alexandre Ferrieux July 27, 2007

July 27, 2007

Hi, In a recent thread I discovered why the "for line in f" idiom was not suitable for live sources (pipes, sockets, tty). The reason is that it uses buffering on input, blocking on a full buffer read before anything. When I asked why it did it this way, the answer came up that it made it faster. Now, *why* is such buffering gaining speed over stdio's fgets(), which already does input buffering (though in a more subtle way, which makes it still usable with pipes etc.) ? -Alex

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Re: Imported globals?
by Valentina Vaneeva July 27, 2007

July 27, 2007

On Jul 27, 2007, at 10:56 PM, Gary Herron wrote: > The variable "value" is global in module_a, and "change_value" will > always refer to that variable. > > However, in module_b, when you from module_a import value, > change_value > you have created two new variables global to module_b that references > values from the other module. > Now running change_value (which changes "value" in module_a has no > affect on the version of "value" in module_b. Your print is then > printing value from module_b -- the unchanged version. Thank you, Gary, but I still have one question. What happens in the second case? If I add a call to change_value() to module_a, the value in module_b is imported changed. Why? What exactly does the import statement import in my example? > Ideas: > 1 If you want module_a to manage such a global variable, you could > include functions for getting, and setting it, as well as your > function for changing it's value. > > 2. You could also dispense with use of global values -- various OOP > techniques could help there. Thanks, this part is not a problem :) Cheers, Valia

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Filtering content of a text file
by Ira.Kovac＠gmail.com July 27, 2007

July 27, 2007

Hello All, I'd greatly appreciate if you can take a look at the task I need help with. It'd be outstanding if someone can provide some sample Python code. Thanks a lot, Ira ------------------------------------------------------------------------------- Problem ------------------------------------------------------------------------------- I am working with 30K+ record datasets in flat file format (.txt) that look like this: //-+alibaba sinage //-+amra damian//_9 //-+anix anire//_ //-+borom //-+bokima sun drane //-+ciren //-+cop calestieon eded //-+ciciban //-+drago kimano sole The records start with the same string (in the example //-+) wich is followed by another string of characters taht's changing from record to record. I am working on one file at the time and for each file I need to be able to do the following: a) By looping thru the file the program should isolate all records that have letter a following the //-+ b) The isolated dataset will contain only records that start with //- +a c) Save the isolated dataset as flat flat text file named a.txt d) Repeat a), b) and c) for all letters of english alphabet (a thru z) and numerical values (0 thru 9) CP: An inch of time is an inch of gold but you can't buy that inch of time with an inch of gold. Random Link Generator -------------------------------------------------- http://www.transactioncodes.com --------------------------------------------------

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Re: Factory pattern again
by Bruno Desthuilliers July 27, 2007

July 27, 2007

Mike Howarth a écrit : > Hi > > I was wondering whether anyone could help me, I'm pretty new to python > coming from a PHP background and I'm having a few products in getting my > head round how to write the factory pattern within python. > > I'm currently looking to try to return values from a db and load up the > relevant objects, values returned are product type (I,S) and product code > (123). > > At the moment I've adapted some code I've found illustrating the factory > method but ideally I would like to use the type to load up the relevant > object. > > Another issue I've found is that I don't seem to be able to access to the > price attribute of each of the object. I'm sure these are very > straightforward issues however I seem to have tied myself in knots over this > and could do with a fresh set of 'pythonic' eyes to help me out. > > registry = {} > > class MetaBase(type): > def __init__(cls, name, bases, dict): > registry[name] = cls > > class Product(object): > __metaclass__ = MetaBase > > class Item(Product): > def __init__(self, *args, **kw): > self.price = 1 > > class Set(Product): > def __init__(self, *args, **kw): > self.price = 2 > > def factory(kind, *args, **kw): > return registry[kind](*args, **kw) > > > item = registry['Item'] This returns the Item *class*, not an instance of... So the following: > print item.price cannot work, since price is an instance attribute, not a class attribute. What you want is: item = factory('Item') print item.price HTH

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pyparser and recursion problem
by pyscottishguy＠hotmail.com July 27, 2007

July 27, 2007

Hi, Using pyparser, I'm trying to parse a string like this: :Start: first SECOND THIRD :SECOND: second1 | second2 :THIRD: third1 | FOURTH :FOURTH: fourth1 | fourth2 I want the parser to do the following: 1) Get the text for the :Start: label e.g ('first SECOND THIRD') 2) Do nothing with the lower-case words e.g ('first') 3) For each upper-case word find the corresponding entries, and replace the word with these entries (the '|' indicates separate records) e.g. for 'SECOND', replace the word with ("second1", "second2") 4 Do this recursively, because each item in '3' can have upper-case words I can do this - but not within pyparser. I had to write a recursive function to do it. I would like to do it within pyparser however. I'm pretty sure I have to use the Forward() function along with a few setResultsName() - but after reading the documentation, many examples, and trying for hours, I'm still totally lost. Please help! Here is the program I have so far: #!/usr/bin/python from pyparsing import Word, Optional, OneOrMore, Group, alphas, alphanums, Suppress, Dict import string def allIn( as, members ): "Tests that all elements of as are in members""" for a in as: if a not in members: return False return True def allUpper( as ): """Tests that all strings in as are uppercase""" return allIn( as, string.uppercase ) def getItems(myArray, myDict): """Recursively get the items for each CAPITAL word""" myElements=[] for element in myArray: myWords=[] for word in element: if allUpper(word): items = getItems(myDict[word], myDict) myWords.append(items) else: myWords.append(word) myElements.append(myWords) return myElements testData = """ :Start: first SECOND THIRD fourth FIFTH :SECOND: second1_1 second1_2 | second2 | second3 :THIRD: third1 third2 | SIXTH :FIFTH: fifth1 | SEVENTH :SIXTH: sixth1_1 sixth1_2 | sixth2 :SEVENTH: EIGHTH | seventh1 :EIGHTH: eighth1 | eighth2 """ label = Suppress(":") + Word(alphas + "_") + Suppress(":") words = Group(OneOrMore(Word(alphanums + "_"))) + Suppress(Optional("|")) data = ~label + OneOrMore(words) line = Group(label + data) doc = Dict(OneOrMore(line)) res = doc.parseString(testData) # This prints out what pyparser gives us for line in res: print line print print startString = res["Start"] items = getItems([startString], res)[0] # This prints out what we want for line in items: print line

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a simple string question
by vedrandekovic＠v-programs.com July 27, 2007

July 27, 2007

Hello, I have one question about string.I am trying to make an function to analyze line of some text, this is my example: "HELLO;HELLO2:WORLD:", if that function in this text find ";" and ":" ( in this example will find both) e.g that function must return this: "HELLO;\nHELLO2:\n\t\t\t\t\t\t\tWORLD:" Regards, Vedran

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