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  • How to add columns to sqlite3 python?

    - by user291071
    I know this is simple but I can't get it working! I have no probs with insert,update or select commands, Lets say I have a dictionary and I want to populate a table with the column names in the dictionary what is wrong with my one line where I add a column? ##create con = sqlite3.connect('linksauthor.db') c = con.cursor() c.execute('''create table linksauthor (links text)''') con.commit() c.close() ##populate author columns allauthors={'joe':1,'bla':2,'mo':3} con = sqlite3.connect('linksauthor.db') c = con.cursor() for author in allauthors: print author print type(author) c.execute("alter table linksauthor add column '%s' 'float'")%author ##what is wrong here? con.commit() c.close()

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  • Python - counting sign changes

    - by dadashek
    I have a list of numbers I am reading left to right. Anytime I encounter a sign change when reading the sequence I want to count it. X = [-3,2,7,-4,1,-1,1,6,-1,0,-2,1] X = [-, +, +, -, +, -, +, +, -, -,-,+] So, in this list there are 8 sign changes. When Item [0] (in this case -3) is negative it is considered a sign change. Also, any 0 in the list is considered [-]. Any help would be greatly appreciated.

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  • Visual Studio Macro: How to perform "File -> Save All" programatically

    - by Sean B
    I am looking for the equivalent of running "File - Save All" before certain Rake macros. What I have so far is: Private Sub Pre_Rake() Dim i As Integer DTE.Documents.SaveAll() For i = 1 To DTE.Solution.Projects.Count If Not DTE.Solution.Projects.Item(i).Saved Then DTE.Solution.Projects.Item(i).Save() End If Next End Sub DTE.Documents.SaveAll works fine, but the for loop does not save the project files as I would expect. If I make a copy of a file in the solution explorer, that file is not included in the project file (.CSPROJ) after Pre_Rake() runs. I would still have to press CTRL-SHIFT-S or File - Save All. So, how to Save All with a Visual Studio Macro?

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  • Python New-style Classes and the Super Function

    - by sfjedi
    This is not the result I expect to see: class A(dict): def __init__(self, *args, **kwargs): self['args'] = args self['kwargs'] = kwargs class B(A): def __init__(self, *args, **kwargs): super(B, self).__init__(args, kwargs) print 'Instance A:', A('monkey', banana=True) #Instance A: {'args': ('monkey',), 'kwargs': {'banana': True}} print 'Instance B:', B('monkey', banana=True) #Instance B: {'args': (('monkey',), {'banana': True}), 'kwargs': {}} I'm just trying to get classes A and B to have consistent values set. I'm not sure why the kwargs are being inserted into the args, but I'm to presume I am either calling init() wrong from the subclass or I'm trying to do something that you just can't do. Any tips?

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  • python / sets / dictionary / initialization

    - by Mario D
    Can someone explain help me understand how the this bit of code works? Particularly how the myHeap assignment works. I know the freq variable is assigned as a dictionary. But what about my myHeap? is it a Set? exe_Data = { 'e' : 0.124167, 't' : 0.0969225, 'a' : 0.0820011, 'i' : 0.0768052, } freq = exe_Data) myHeap = [[pct, [symbol, ""]] for symbol, pct in freq.items()]

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  • Multiprocessing vs Threading Python

    - by John
    Hello, I am trying to understand the advantages of the module Multiprocessing over Threading. I know that Multiprocessing get's around the Global Interpreter Lock, but what other advantages are there, and can threading not do the same thing?

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  • Creating Thread's in python

    - by chrissygormley
    Hello, I have a script and I want one function to run at the same time as the other. Example code I have looked at: import threading def MyThread ( threading.thread ): doing something........ def MyThread2 ( threading.thread ): doing something........ MyThread().start() MyThread2().start() I am having trouble getting this working. I would prefer to get this going using a threaded function rather than a class. Thanks for any help.

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  • python sending incomplete data over socket

    - by tipu
    I have this socket server script, import SocketServer import shelve import zlib class MyTCPHandler(SocketServer.BaseRequestHandler): def handle(self): self.words = shelve.open('/home/tipu/Dropbox/dev/workspace/search/words.db', 'r'); self.tweets = shelve.open('/home/tipu/Dropbox/dev/workspace/search/tweets.db', 'r'); param = self.request.recv(1024).strip() try: result = str(self.words[param]) except KeyError: result = "set()" self.request.send(str(result)) if __name__ == "__main__": HOST, PORT = "localhost", 50007 SocketServer.TCPServer.allow_reuse_address = True server = SocketServer.TCPServer((HOST, PORT), MyTCPHandler) server.serve_forever() And this receiver, from django.http import HttpResponse from django.template import Context, loader import shelve import zlib import socket def index(req, param = ''): HOST = 'localhost' PORT = 50007 s = socket.socket(socket.AF_INET, socket.SOCK_STREAM) s.connect((HOST, PORT)) s.send(param) data = zlib.decompress(s.recv(131072)) s.close() print 'Received', repr(data) t = loader.get_template('index.html') c = Context({ 'foo' : data }) return HttpResponse(t.render(c)) I am sending strings to the receiver that are in the hundreds of kilobytes. I end up only receiving a portion of it. Is there a way that I can fix that so that the whole string is sent?

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  • Visual Studio 2010 Language Support

    - by inspectorG4dget
    Hello SO, I want to be able to develop code using Visual Studio 2010. I just got VS2010 and I'm not able to get the languages I want on it. The main reason that I'm asking this is that I'm trying to migrate to ONE IDE that does it all for me. Thus far eclipse has been doing a good job, but I've been informed that VS2010 is better and I'm trying to get into the groove of that standard So my question is two-fold. I am not able to find a complete list of languages supported by VS2010. What are these languages? How can I get VS2010 support for: a. Python/IronPython b. C/C++/C#/XNA c. Java My Googling has given me no promising/definitive results. I'd really appreciate any help.

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  • List comprehension from multiple sources in Python?

    - by Noah
    Is it possible to replace the following with a list comprehension? res = [] for a, _, c in myList: for i in c: res.append((a, i)) For example: # Input myList = [("Foo", None, [1, 2, 3]), ("Bar", None, ["i", "j"])] # Output res = [("Foo", 1), ("Foo", 2), ("Foo", 3), ("Bar", "i"), ("Bar", "j")]

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  • Python: Convert format string to regular expression

    - by miracle2k
    The users of my app can configure the layout of certain files via a format string. For example, the config value the user specifies might be: layout = '%(group)s/foo-%(locale)s/file.txt' I now need to find all such files that already exist. This seems easy enough using the glob module: glob_pattern = layout % {'group': '*', 'locale': '*'} glob.glob(glob_pattern) However, now comes the hard part: Given the list of glob results, I need to get all those filename-parts that matched a given placeholder, for example all the different "locale" values. I thought I would generate a regular expression for the format string that I could then match against the list of glob results (or then possibly skipping glob and doing all the matching myself). But I can't find a nice way to create the regex with both the proper group captures, and escaping the rest of the input. For example, this might give me a regex that matches the locales: regex = layout % {'group': '.*', 'locale': (.*)} But to be sure the regex is valid, I need to pass it through re.escape(), which then also escapes the regex syntax I have just inserted. Calling re.escape() first ruins the format string. I know there's fnmatch.translate(), which would even give me a regex - but not one that returns the proper groups. Is there a good way to do this, without a hack like replacing the placeholders with a regex-safe unique value etc.? Is there possibly some way (a third party library perhaps?) that allows dissecting a format string in a more flexible way, for example splitting the string at the placeholder locations?

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  • Visual Studio 2008 Explicit Reference Error

    - by Alan
    I have a project which references a dll in the same solution (called "Common"). Common has two types of errors with the same names but different namespaces i.e. Common.Login.UserDeleted Common.Imaging.UserDeleted When I type UserDeleted visual studio recognizes both of these and asks for which it is ("ambiguous reference"). I right-click UserDeleted and select one of the two above, yet it then says that the type or reference doesn't exist! It doesn't make any sense. Why is this happening? I can't compile my program until I find a solution to this, thanks

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  • Python: HTTP Post a large file with streaming

    - by Daniel Von Fange
    I'm uploading potentially large files to a web server. Currently I'm doing this: import urllib2 f = open('somelargefile.zip','rb') request = urllib2.Request(url,f.read()) request.add_header("Content-Type", "application/zip") response = urllib2.urlopen(request) However, this reads the entire file's contents into memory before posting it. How can I have it stream the file to the server?

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  • Python Eggs on Google App Engine

    - by ott
    Usually I would use virtualenv and pip for deployment of web applications. With Google App Engine this doesn't work, because all import statement are relative to directory of the application. The most common approach I saw was to simply copy the packages from site-packages to the directory of the application. This involves manual work and is error-prone. Another approach was to changes install_lib and install_scripts in ~/.pydisutils.cfg, but this doesn't allow me to use pip in my home directory simultaneously. Do you have any suggestions for this?

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  • Load resources? - wxPython / Python

    - by Francisco Aleixo
    Hello everyone. I am using wxPython and Py2exe to create my application and my only problem is loading for example bitmaps. Ok so lets say I want to add an image to my application, and thats fairly easy using wxPython, and lets say it is on the same directory of my .py so for example: image = wx.StaticBitmap(self, -1, wx.Bitmap('image.bmp') Now, this works obviously fine, problem is when I convert to Py2exe, I would like to use the resources from the dlls that I included in the Py2Exe compilation. So basically what I want to do is to instead of including the images on the same folder as my application in order to work, I would like to use it from the resources so people won't see the images on the folder.

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  • Calling a method with getattr in Python

    - by brain_damage
    How to call a method using getattr? I want to create a metaclass, which can call non-existing methods of some other class that start with the word 'oposite_'. The method should have the same number of arguments, but to return the opposite result. def oposite(func): return lambda s, *args, **kw: not oposite(s, *args, **kw) class Negate(type): def __getattr__(self, name): if name.startswith('oposite_'): return oposite(self.__getattr__(name[8:])) def __init__(self,*args,**kwargs): self.__getattr__ = Negate.__getattr__ class P(metaclass=Negate): def yep(self): return True But the problem is that self.__getattr__(sth) returns a NoneType object. >>> p = P() >>> p.oposite_yep() Traceback (most recent call last): File "<pyshell#115>", line 1, in <module> p.oposite_yep() TypeError: <lambda>() takes at least 1 positional argument (0 given) How to deal with this?

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