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  • Python regex help

    - by Dormish
    I am trying to make a regex that finds all names, url and phone numbers in an html page. But I'm having trouble with the phone number part. I think the problem with the numbers part is that is searches until it finds the </strong> but in that process it skips people, instead of making a empty string if the person has no phone number ( simply put instead of a list like this: url1+name1+num1 | url2+name2+"" | url3+name3+num3 it returns a list like this: url1+name1+num1 | url2+name2+num3 , with url3+name3 deleted in the process) for url, name, pnumber in re.findall('Name"><div>(?:<a href="/si([^">]*)"> )?([^<]*)(?:.*?</strong>([^<]*))?',page): I am searchin for people in s single very long line. A person could have an url or phone number. An example of a person with an url and a phone number <tr> <td class="lablinksName"><div><a href="/si/ivan-bratko/default.html"> dr. Ivan Bratko akad. prof.</a></div></td> <td class="lablinksMail"><a href="javascript:void(cmPopup('sendMessage', '/si/ivan-bratko/mailer.html', true, 350, 350));"><img src="/Static/images/gui/mail.gif" height="8" width="11"></a></td> <td class="lablinksPhone"><div><strong>T:</strong> +386 1 4768 393 </div></td> </tr> And an example of a person with no url or phone number <tr> <td class="lablinksName"><div> dr. Branko Matjaž Juric prof.</div></td> <td class="lablinksMail"><a href="javascript:void(cmPopup('sendMessage', '/si/branko-matjaz-juric/mailer.html', true, 350, 350));"><img src="/Static/images/gui/mail.gif" height="8" width="11"></a></td> <td class="lablinksPhone"><div> </div></td> </tr> I hope i was clear enough and if any one can help me.

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  • weakref list in python

    - by Dan
    I'm in need of a list of weak references that deletes items when they die. Currently the only way I have of doing this is to keep flushing the list (removing dead references manually). I'm aware there's a WeakKeyDictionary and a WeakValueDictionary, but I'm really after a WeakList, is there a way of doing this? Here's an example: import weakref class A(object): def __init__(self): pass class B(object): def __init__(self): self._references = [] def addReference(self, obj): self._references.append(weakref.ref(obj)) def flush(self): toRemove = [] for ref in self._references: if ref() is None: toRemove.append(ref) for item in toRemove: self._references.remove(item) b = B() a1 = A() b.addReference(a1) a2 = A() b.addReference(a2) del a1 b.flush() del a2 b.flush()

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  • global variable and Python

    - by rejinacm
    A global variable created in one function cannot be used in another function directly. Instead I need to store the global variable in a local variable of the function which needs its access. Am I correct? Why is it so?

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  • finding the missing values in a range using any scripting language - perl, python or shell script

    - by manu
    Hi everyone I got stuck in one problem of finding the missing values in a range and the range is also variable for the successive rows. Ex. =================== inpt ==================== 673 673 673 676 676 680 2667 2667 2668 2670 2671 2674 ===================== output should be like this =================== 674 675 677 678 679 2669 2672 2673 ======================== This is just one part and the row values can be more also If there is any clarification plz let me know. thanx in advance manu

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  • Python mistaking float for string

    - by wrongusername
    I receive TypeError: Can't convert 'float' object to str implicitly while using Gambler.pot += round(self.bet + self.money * 0.1) where pot, bet, and money are all doubles (or at least are supposed to be). I'm not sure if this is yet another Eclipse thing, but how do I get the line to compile? Code where bet and money are initialized: money = 0 bet = 0

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  • problem plotting on logscale in matplotlib in python

    - by user248237
    I am trying to plot the following numbers on a log scale as a scatter plot in matplotlib. Both the quantities on the x and y axes have very different scales, and one of the variables has a huge dynamic range (nearly 0 to 12 million roughly) while the other is between nearly 0 and 2. I think it might be good to plot both on a log scale. I tried the following, for a subset of the values of the two variables: fig = plt.figure(figsize(8, 8)) ax = fig.add_subplot(1, 1, 1) ax.set_yscale('log') ax.set_xscale('log') plt.scatter([1.341, 0.1034, 0.6076, 1.4278, 0.0374], [0.37, 0.12, 0.22, 0.4, 0.08]) The x-axes appear log scaled but the points do not appear -- only two points appear. Any idea how to fix this? Also, how can I make this log scale appear on a square axes, so that the correlation between the two variables can be interpreted from the scatter plot? thanks.

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  • recursively implementing 'minimum number of coins' in python

    - by user5198
    This problem is same as asked in here. Given a list of coins, their values (c1, c2, c3, ... cj, ...), and the total sum i. Find the minimum number of coins the sum of which is i (we can use as many coins of one type as we want), or report that it's not possible to select coins in such a way that they sum up to S. I"m just introduced to dynamic programming yesterday and I tried to make a code for it. # Optimal substructure: C[i] = 1 + min_j(C[i-cj]) cdict = {} def C(i, coins): if i <= 0: return 0 if i in cdict: return cdict[i] else: answer = 1 + min([C(i - cj, coins) for cj in coins]) cdict[i] = answer return answer Here, C[i] is the optimal solution for amount of money 'i'. And available coins are {c1, c2, ... , cj, ...} for the program, I've increased the recursion limit to avoid maximum recursion depth exceeded error. But, this program gives the right answer only someones and when a solution is not possible, it doesn't indicate that. What is wrong with my code and how to correct it?

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  • Python optimization

    - by Rami Jarrar
    Hi, I do like this: f = open('wl4.txt', 'w') hh = 0 ###################################### for n in range(1,5): for l in range(33,127): if n==1: b = chr(l) + '\n' f.write(b) hh += 1 elif n==2: for s0 in range(33, 127): b = chr(l) + chr(s0) + '\n' f.write(b) hh += 1 elif n==3: for s0 in range(33, 127): for s1 in range(33, 127): b = chr(l) + chr(s0) + chr(s1) + '\n' f.write(b) hh += 1 elif n==4: for s0 in range(33, 127): for s1 in range(33, 127): for s2 in range(33,127): b = chr(l) + chr(s0) + chr(s1) + chr(s2) + '\n' f.write(b) hh += 1 ###################################### print "We Made %d Words." %(hh) ###################################### f.close() So, is there any method to make it faster?

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  • Operations on Python hashes

    - by cdecker
    I've got a rather strange problem. For a Distributed Hash Table I need to be able to do some simple math operations on MD5 hashes. These include a sum (numeric sum represented by the hash) and a modulo operation. Now I'm wondering what the best way to implement these operations is. I'm using hashlib to calculate the hashes, but since the hashes I get are then string, how do I calculate with them?

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  • Can someone here explain constructors and destructors in python - simple explanation required - new

    - by rgolwalkar
    i will try to see if it makes sense :- class Person: '''Represnts a person ''' population = 0 def __init__(self,name): //some statements and population += 1 def __del__(self): //some statements and population -= 1 def sayHi(self): '''grettings from person''' print 'Hi My name is %s' % self.name def howMany(self): '''Prints the current population''' if Person.population == 1: print 'i am the only one here' else: print 'There are still %d guyz left ' % Person.population rohan = Person('Rohan') rohan.sayHi() rohan.howMany() sanju = Person('Sanjivi') sanju.howMany() del rohan # am i doing this correctly --- ? i need to get an explanation for this del - destructor O/P:- Initializing person data ****************************************** Initializing Rohan ****************************************** Population now is: 1 Hi My name is Rohan i am the only one here Initializing person data ****************************************** Initializing Sanjivi ****************************************** Population now is: 2 In case Person dies: ****************************************** Sanjivi Bye Bye world there are still 1 people left i am the only one here In case Person dies: ****************************************** Rohan Bye Bye world i am the last person on earth Population now is: 0 If required i can paste the whole lesson as well --- learning from :- http://www.ibiblio.org/swaroopch/byteofpython/read/

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  • How to log python exception ?

    - by Maxim Veksler
    Hi, Coming from java, being familiar with logback I used to do try { ... catch (Exception e) { log("Error at X", e); } I would like the same functionality of being able to log the exception and the stacktrace into a file. How would you recommend me implementing this? Currently using boto logging infrastructre, boto.log.info(...) I've looked at some options and found out I can access the actual exception details using this code: import sys try: 1/0 except: exc_type, exc_value, exc_traceback = sys.exc_info() traceback.print_exception(exc_type, exc_value, exc_traceback) I would like to somehow get the string print_exception() throws to stdout so that I can log it. Thank you, Maxim.

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  • [Python]Xml add a node from another xml document

    - by michele
    Hi, I have two xml file: 1)model.xml 2)projectionParametersTemplate.xml I want to extract from 1) Algorithm Node with his child and put it in 2) I have wrote this code but it doesn't function. from xml.dom.minidom import Document from xml.dom import minidom xmlmodel=minidom.parse("/home/michele/Scrivania/d/model.xml") xmltemplate=minidom.parse("/home/michele/Scrivania/d/projectionParametersTemplate.xml") for Node in xmlmodel.getElementsByTagName("Algorithm"): print "\nNode: "+str(Node) for Node2 in xmltemplate.getElementsByTagName("ProjectionParameters"): print "\nNode2: "+str(Node2) Node2.appendChild(Node) This is model.xml link text This is projectionParametersTemplate.xml link text Thanks a lot.

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  • Python datetime not including DST when using pytz timezone

    - by Jesper
    If I convert a UTC datetime to swedish format, summertime is included (CEST). However, while creating a datetime with sweden as the timezone, it gets CET instead of CEST. Why is this? >>> # Modified for readability >>> import pytz >>> import datetime >>> sweden = pytz.timezone('Europe/Stockholm') >>> >>> datetime.datetime(2010, 4, 20, 16, 20, tzinfo=pytz.utc).astimezone(sweden) datetime(2010, 4, 20, 18, 20, tzinfo=<... 'Europe/Stockholm' CEST+2:00:00 DST>) >>> >>> datetime.datetime(2010, 4, 20, 18, 20, tzinfo=sweden) datetime(2010, 4, 20, 18, 20, tzinfo=<... 'Europe/Stockholm' CET+1:00:00 STD>) >>>

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  • Python class decorator and maximum recursion depth exceeded

    - by Michal Lula
    I try define class decorator. I have problem with __init__ method in decorated class. If __init__ method invokes super the RuntimeError maximum recursion depth exceeded is raised. Code example: def decorate(cls): class NewClass(cls): pass return NewClass @decorate class Foo(object): def __init__(self, *args, **kwargs): super(Foo, self).__init__(*args, **kwargs) What I doing wrong? Thanks, Michal

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  • Python: load variables in a dict into namespace

    - by celil
    I want to use a bunch of local variables defined in a function, outside of the function, so I am passing x=locals() as a return value. How can I load all the variables defined in that dictionary into the namespace outside the function, so that instead of accessing the value using x['variable'], I could simply use variable.

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  • Dynamic/runtime method creation (code generation) in Python

    - by Eli Bendersky
    Hello, I need to generate code for a method at runtime. It's important to be able to run arbitrary code and have a docstring. I came up with a solution combining exec and setattr, here's a dummy example: class Viking(object): def __init__(self): code = ''' def dynamo(self, arg): """ dynamo's a dynamic method! """ self.weight += 1 return arg * self.weight ''' self.weight = 50 d = {} exec code.strip() in d setattr(self.__class__, 'dynamo', d['dynamo']) if __name__ == "__main__": v = Viking() print v.dynamo(10) print v.dynamo(10) print v.dynamo.__doc__ Is there a better / safer / more idiomatic way of achieving the same result?

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  • Overlapping matches with finditer() in Python

    - by Raphink
    Hi there, I'm using a regex to match Bible verse references in a text. The current regex is REF_REGEX = re.compile(r'(?<!\w)((?i)q(?:uote)?\s+)?((?:(?:[1-3]|I{1,3})\s*)?[A-Za-z]+)\.?(?:\s*(\d+)(?:[:.](\d+)(?:-(\d+))?)?)(?:\s+(?:(?i)(?:from\s+)|(?:in\s+)|(?P<lbrace>\())\s*(\w+)(?(lbrace)\)))?', re.UNICODE) This matches the following expressions fine: "jn 3:16": (None, 'jn', '3', '16', None, None, None), "matt. 18:21-22": (None, 'matt', '18', '21', '22', None, None), "q matt. 18:21-22": ('q ', 'matt', '18', '21', '22', None, None), "QuOTe jn 3:16": ('QuOTe ', 'jn', '3', '16', None, None, None), "q 1co13:1": ('q ', '1co', '13', '1', None, None, None), "q 1 co 13:1": ('q ', '1 co', '13', '1', None, None, None), "quote 1 co 13:1": ('quote ', '1 co', '13', '1', None, None, None), "quote 1co13:1": ('quote ', '1co', '13', '1', None, None, None), "jean 3:18 (PDV)": (None, 'jean', '3', '18', None, '(', 'PDV'), "quote malachie 1.1-2 fRom Colombe": ('quote ', 'malachie', '1', '1', '2', None, 'Colombe'), "quote malachie 1.1-2 In Colombe": ('quote ', 'malachie', '1', '1', '2', None, 'Colombe'), "cinq jn 3:16 (test)": (None, 'jn', '3', '16', None, '(', 'test'), "Q IIKings5.13-58 from wolof": ('Q ', 'IIKings', '5', '13', '58', None, 'wolof'), "This text is about lv5.4-6 in KJV only": (None, 'lv', '5', '4', '6', None, 'KJV'), but it fails to parse: "Found in 2 Cor. 5:18-21 ( Ministers": (None, '2 Cor', '5', '18', '21', None, None), because it returns (None, 'in', '2', None, None, None, None) instead. Is there a way to get finditer() to return all matches, even if they overlap, or is there a way to improve my regex so it matches this last bit properly? Thanks.

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  • Python: Decent config file format

    - by miracle2k
    I'd like to use a configuration file format which supports key value pairs and nestable, repeatable structures, and which is as light on syntax as possible. I'm imagining something along the lines of: cachedir = /var/cache mail_to = [email protected] job { name = my-media frequency = 1 day source { from = /home/michael/Images source { } source { } } job { } I'd be happy with something using significant-whitespace as well. JSON requires too many explicit syntax rules (quoting, commas, etc.). YAML is actually pretty good, but would require the jobs to be defined as a YAML list, which I find slightly awkward to use.

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  • Python port forwarding/multiplexing server

    - by Ib33X
    I would like to make server that listen on UDP port 162 (SNMP trap) and then forwards this traffic to multiple clients. Also important is that the source port & address stays same (address spoofing). I guess that best tool for this would be Twisted or Scapy or mybe vanilla sockets, only I can't find anything in the documentation for Twisted about source address spoofing/forging. What would you recommend me to do? Edit:added bounty

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  • A Python Wrapper for Shutterfly. Uploading an Image

    - by iJames
    I'm working on a Django app in which I want to order prints through Shutterfly's Open API: http://www.shutterfly.com/documentation/start.sfly So far I've been able to build the appropriate POSTs and GETs using the modules and suggested code snippets including httplib, httplib2, urllib, urllib2, mimetype, etc. But I'm stuck on the image uploading when placing an order (the ordering process is not the same process as uploading images to albums which I haven't tried.) From what I can tell, I'm supposed to basically create the multipart form data by concatenating the HTTP request body together with the binary data of the image. I take the strings: --myuniqueboundary1273149960.175.1 Content-Disposition: form-data; name="AuthenticationID" auniqueauthenticationid --myuniqueboundary1273149960.175.1 Content-Disposition: file; name="Image.Data"; filename="1_41_orig.jpg" Content-Type: image/jpeg and I put this data into it and end with the final boundary: ...\xb5|\xf88\x1dj\t@\xd9\'\x1f\xc6j\x88{\x8a\xc0\x18\x8eGaJG\x03\xe9J-\xd8\x96[\x91T\xc3\x0eTu\xf4\xaa\xa5Ty\x80\x01\x8c\x9f\xe9Z\xad\x8cg\xba# g\x18\xe2\xaa:\x829\x02\xb4["\x17Q\xe7\x801\xea?\xad7j\xfd\xa2\xdf\x81\xd2\x84D\xb6)\xa8\xcb\xc8O\\\x9a\xaf(\x1cqM\x98\x8d*\xb8\'h\xc8+\x8e:u\xaa\xf3*\x9b\x95\x05F8\xedN%\xcb\xe1B2\xa9~Tw\xedF\xc4\xfe\xe8\xfc\xa9\x983\xff\xd9... That ends up making it look like this (when I use print to debug): ... --myuniqueboundary1273149960.175.1 Content-Disposition: file; name="Image.Data"; filename="1_41_orig.jpg" Content-Type: image/jpeg ????q?ExifMM* ? ??(1?2?<??i?b?NIKON CORPORATIONNIKON D40HHQuickTime 7.62009:02:17 13:05:25Mac OS X 10.5.6%??????"?'??0220?????? ???? ? ?|_???,b???50??5 ... --myuniqueboundary1273149960.175.1-- My code for grabbing the binary data is pretty much this: filedata = open('myjpegfile.jpeg','rb').read() Which I then add to the rest of the body. I've see something like this code everywhere. I'm then using this to post the full request (with the headers too): response = urllib2.urlopen(request).read() This seems to me to be the standard way that form POSTS with files happens. Am I missing something here? At some point I might be able to make this into a library worth posting up on github, but this problem has stopped me cold in my tracks. Thanks for any insight!

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  • Remove certain filetypes in Python

    - by Gareth
    Hello. I am running a script that walks a directory structure and generates new files in each folder in the directory. I want to delete some of the files right after creation. This is my idea, but it is quite wrong I imagine: directory = os.path.dirname(obj) m = MeshExporterApplication(directory) os.remove(os.path.join(directory,"*.mesh.xml")) How to you put wildcards in a path? I guess not like /home/me/*.txt, but that is what I am trying. Thanks, Gareth

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  • Regex in Python

    - by newToProgramming
    SO, I am trying create a simple regex that matches the following string: ..."chrX:33267175-33267784 610bp TGATGTTTGGCGAGGAACTC GCAGAGTTTGAAGAGCTCGG\nTGATGTTTGGCGAGGAACTCtactattgttacacttaggaaaataatcta\natccaaaggctttgcatctgtacagaagagcgagtagatactgaaagaga\ntttgcagatccactgttttttaggcaggaagaatgctcgttaaatgcaaa\ncgctgctctggctcatgtgtttgctccgaggtataggttttgttcgactg\nacgtatcagatagtcagagtggttaccacaccgacgttgtagcagctgca\ntaataaatgactgaaagaatcatgttaggcatgcccacctaacctaactt\ngaatcatgcgaaaggggagctgttggaattcaaatagactttctggttcc\ncagcagtcggcagtaatagaatgctttcaggaagatgacagaatcaggag\naaagatgctgttttgcactatcttgatttgttacagcagccaacttattg\ngcatgatggagtgacaggaaaaacagctggcatggaaggtaggattatta\naagctattacatcattacaaatacaattagaagctggccatgacaaagca\ntatgtttgaacaagcagctgttggtagctggggtttgttgCCGAGCTCTT\nCAAACTCTGC\n"... I have created the following regex: <PRE>[.|[\n]]*</PRE>' yet it won't match the string above. Does anyone have a solution to this conundrum and perhaps a reasoning as toward why this doesn't work.

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  • Joining the previous and next sentence using python

    - by JudoWill
    I'm trying to join a set of sentences contained in a list. I have a function which determines whether a sentence in worth saving. However, in order to keep the context of the sentence I need to also keep the sentence before and after it. In the edge cases, where its either the first or last sentence then, I'll just keep the sentence and its only neighbor. An example is best: ex_paragraph = ['The quick brown fox jumps over the fence.', 'Where there is another red fox.', 'They run off together.', 'They live hapily ever after.'] t1 = lambda x: x.startswith('Where') t2 = lambda x: x'startswith('The ') The result for t1 should be: ['The quick brown fox jumps over the fence. Where there is another red fox. They run off together.'] The result for t2 should be: ['The quick brown fox jumps over the fence. Where there is another red fox.'] My solution is: def YieldContext(sent_list, cont_fun): def JoinSent(sent_list, ind): if ind == 0: return sent_list[ind]+sent_list[ind+1] elif ind == len(sent_list)-1: return sent_list[ind-1]+sent_list[ind] else: return ' '.join(sent_list[ind-1:ind+1]) for sent, sentnum in izip(sent_list, count(0)): if cont_fun(sent): yield JoinSent(sent_list, sent_num) Does anyone know a "cleaner" or more pythonic way to do something like this. The if-elif-else seems a little forced. Thanks, Will PS. I'm obviously doing this with a more complicated "context-function" but this is just for a simple example.

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  • Converting a Doc object into a string in python

    - by Sam
    I'm using minidom to parse through an xml document. I took the data with yum tags and stored them in a list and calculated the frequency of the words. However, its not storing or reading them as strings in the list. Is there another way to do it? Right now this is what I have: yumNodes = [node for node in doc.getElementsByTagName("yum")] for node in yumNodes: yumlist.append(t.data for t in node.childNodes if t.nodeType == t.TEXT_NODE) for ob in yumlist: for o in ob: if word not in freqDict: freqDict[word] = 1 else: freqDict[word] += 1

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  • Get last n lines of a file with Python, similar to tail

    - by Armin Ronacher
    I'm writing a log file viewer for a web application and for that I want to paginate through the lines of the log file. The items in the file are line based with the newest item on the bottom. So I need a tail() method that can read n lines from the bottom and supports an offset. What I came up with looks like this: def tail(f, n, offset=0): """Reads a n lines from f with an offset of offset lines.""" avg_line_length = 74 to_read = n + offset while 1: try: f.seek(-(avg_line_length * to_read), 2) except IOError: # woops. apparently file is smaller than what we want # to step back, go to the beginning instead f.seek(0) pos = f.tell() lines = f.read().splitlines() if len(lines) >= to_read or pos == 0: return lines[-to_read:offset and -offset or None] avg_line_length *= 1.3 Is this a reasonable approach? What is the recommended way to tail log files with offsets?

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