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  • How do I copy only the values and not the references from a Python list?

    - by wrongusername
    Specifically, I want to create a backup of a list, then make some changes to that list, append all the changes to a third list, but then reset the first list with the backup before making further changes, etc, until I'm finished making changes and want to copy back all the content in the third list to the first one. Unfortunately, it seems that whenever I make changes to the first list in another function, the backup gets changed also. Using original = backup didn't work too well; nor did using def setEqual(restore, backup): restore = [] for number in backup: restore.append(number) solve my problem; even though I successfully restored the list from the backup, the backup nevertheless changed whenever I changed the original list. How would I go about solving this problem?

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  • How to add a property to a module in boost::python?

    - by Checkers
    You can add a property to a class using a getter and a setter (in a simplistic case): class<X>("X") .add_property("foo", &X::get_foo, &X::set_foo); But how to add a property to a module itself (not a class)? There is scope().attr("globalAttr") = ??? something ??? and def("globalAttr", ??? something ???); I can add global functions and objects of my class using the above two ways, but can't seem to add properties the same way as in classes.

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  • Can I create object names from a text file in Python 2.7?

    - by user560100
    I'm working on a game project. I've created an object, Star(Object). I want to assign the name of the variables, dynamically, from a text file. If I have a text file with: Sol Centauri Vega I want the program to create the Star(Object) with variable names from the text file. I want the process automated, because I'm looking to create hundreds of stars. I could write the code out by hand: Sol = Star(Sol) Centauri = Star(Centauri) Vega = Star(Vega) But isn't there a way to automate this? Essentially, what I eventually want is a tuple with the list of stars, as their own objects. Then, when I am doing game maintenance, I can just iterate over all the objects in the tuple.

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  • Learning python in one weekend

    - by permalac
    Hello, I'm planing to learn python this weekend. I have some programing skills and should not be difficult if I take the good path. I'm a sysadmin and I've been looking at python scripts since long ago, but now I would like to make python my scripting language, so I'll do the effort and next monday I will start using it. Any advice on how to trace my own path to good python skills? thanks. PS: I will use vim, ypython and http://diveintopython.org

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  • python sqlite fails

    - by lakshmipathi
    My program uses sqlite3 plus python. It works fine with python 2.6.2 I moved it another machine and installed 2.6.4 and running the program gave me this error File "", line 1, in File "/opt/python-2.6.4/lib/python2.6/sqlite3/init.py", line 24, in from dbapi2 import * File "/opt/python-2.6.4/lib/python2.6/sqlite3/dbapi2.py", line 27, in from _sqlite3 import * ImportError: No module named _sqlite3

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  • A Question about using jython when run a receving socket in python

    - by abusemind
    Hi, I have not a lot of knowledge of python and network programming. Currently I am trying to implement a simple application which can receive a text message sent by the user, fetch some information from the google search api, and return the results via text message to the user. This application will continue to listening to the users messages and reply immediately. How I get the text short message sent by the user? It's a program named fetion from the mobile supplier in China. The client side fetion, just like a instant communication tool, can send/receive messages to/from other people who are using mobile to receive/send SMS. I am using a open source python program that simulates the fetion program. So basically I can use this python program to communate with others who using cell phone via SMS. My core program is based on java, so I need to take this python program into java environment. I am using jython, and now I am available to send messages to users by some lines of java codes. But the real question is the process of receving from users via SMS. In python code, a new thread is created to continuously listen to the user. It should be OK in Python, but when I run the similar process in Jython, the following exception occurs: Exception in thread Thread:Traceback (most recent call last): File "D:\jython2.5.1\Lib\threading.py", line 178, in _Thread__bootstrap self.run() File "<iostream>", line 1389, in run File "<iostream>", line 1207, in receive File "<iostream>", line 1207, in receive File "<iostream>", line 150, in recv File "D:\jython2.5.1\Lib\select.py", line 223, in native_select pobj.register(fd, POLLIN) File "D:\jython2.5.1\Lib\select.py", line 104, in register raise _map_exception(jlx) error: (20000, 'socket must be in non-blocking mode') The line 150 in the python code is as follows: def recv(self,timeout=False): if self.login_type == "HTTP": time.sleep(10) return self.get_offline_msg() pass else: if timeout: infd,outfd,errfd = select([self.__sock,],[],[],timeout)//<---line 150 here else: infd,outfd,errfd = select([self.__sock,],[],[]) if len(infd) != 0: ret = self.__tcp_recv() num = len(ret) d_print(('num',),locals()) if num == 0: return ret if num == 1: return ret[0] for r in ret: self.queue.put(r) d_print(('r',),locals()) if not self.queue.empty(): return self.queue.get() else: return "TimeOut" Because of I am not very familiar with python, especially the socket part, and also new in Jython use, I really need your help or only advice or explanation. Thank you very much!

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  • Why does Python Array Module Process Strings and Lists Differently?

    - by Casey
    I'm having trouble understanding the result of the following statements: >>> from array import array >>> array('L',[0xff,0xff,0xff,0xff]) array('L', [255L, 255L, 255L, 255L]) >>> from array import array >>> array('L','\xff\xff\xff\xff') Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: string length not a multiple of item size

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  • problem with python script

    - by hidayat
    I want to run a csh file from a python scrip, example, #!/usr/bin/python import os os.system("source path/to/file.csh") and I want this file to run in the same shell as I am running the python script, because the file.csh script is settings some environment variables that I need. Does anyone know how to do this in Python?

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  • Python-How to call up a function from another module?

    - by user2691540
    I am making a project where I need several modules which are imported into one main module to make a pizza ordering service. Upon finishing this (to a working standard) I decided to re-code it so that the whole order is completed with one tkinter window, now instead of using input(), I use tkinter.Entry() etc. etc. To do this I had to use functions for each step so it is broken up nicely, e.g. the code asks if the user wants pickup or delivery, the user clicks a button which sets some variables and one of the buttons is then configured to say "continue" and the command leads to the next step of the pizza ordering process e.g. getting the name. The problem I have is that when I get past the last function of the first module the configured button has a command to go to a function in the second module, but it says that the command is not defined??? I have tried my way around this but cannot import the configured button variable into the next module, and anything else I tried gave no result, it simply doesn't go to the next module after the first module is done. I have made the main tkinter window in the main module and have it that it will mainloop after importing the other modules so shouldn't the function I want to call upon be defined? How can I get from one function to the next if the latter is in a seperate module? Is this possible or do I have to rethink my approach and if so how? Ok then, have made some more code to show what my problem is, this isn't what I am actually using but it's a lot shorter and has the same issue: this is the main module: import tkinter mainwindow = tkinter.Tk() # here i set the window to a certain size etc. import mod1 import mod2 mainwindow.mainloop() this is mod1: import tkinter def button1(): label.destroy() button1.destroy() button2.config(text = "continue", command = func2) def button2(): label.destroy() button1.destroy() button2.config(text = "continue", command = func2) label = tkinter.Label(text = "example label") button1 = tkinter.Button(text = "button1", command = button1) button2 = tkinter.Button(text = "button2", command = button2) label.pack() button1.pack() button2.pack() this is mod2: def func2(): button2.destroy() print ("haha it works...") I still get the problem that func2 is not defined? Thanks in advance

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  • Problem installing MySQLdb on windows - Can't find python

    - by aldux
    I'm trying to install the module mySQLdb on a windows vista 64 (amd) machine. I've installed python on a different folder other than suggested by Python installer. When I try to install the .exe mySQLdb installer, it can't find python 2.5 and it halts the installation. Is there anyway to supply the installer with the correct python location (even thou the registry and path are right)?

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  • Why does Python array moduel handle strings and lists differently?

    - by Casey
    I'm having trouble understanding the result of the following statements: >>> from array import array >>> array('L',[0xff,0xff,0xff,0xff]) array('L', [255L, 255L, 255L, 255L]) >>> from array import array >>> array('L','\xff\xff\xff\xff') Traceback (most recent call last): File "<stdin>", line 1, in <module> ValueError: string length not a multiple of item size

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  • call a server side python script from javascript

    - by alex
    how to call a server side python script from javascript. if test.py is the python script file in server, and if the parameter to be passed to python is another url , then how this can be executed from javascript, how the return string from python script is obtained to the javascript.

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  • Mutable global variables don't get hide in python functions, right?

    - by aXqd
    Please see the following code: def good(): foo[0] = 9 # why this foo isn't local variable who hides the global one def bad(): foo = [9, 2, 3] # foo is local, who hides the global one for func in [good, bad]: foo = [1,2,3] print('Before "{}": {}'.format(func.__name__, foo)) func() print('After "{}": {}'.format(func.__name__, foo)) The result is as below: # python3 foo.py Before "good": [1, 2, 3] After "good": [9, 2, 3] Before "bad" : [1, 2, 3] After "bad" : [1, 2, 3]

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  • python: html writer?

    - by Bin Chen
    With jquery it's very easy to insert some element inside another element using the selector technology, I am wondering if there is any python library that can do things similar with jquery, the reason is I want server side python program to produce the static pages, which needs to parse the html and insert something into it. Or other alternative, not in python language at all? EDIT: To be clear, I want to use python to write below program: h = html.parse('temp.html') h.find('#idnum').html('<b>my html generated</b>') h.close()

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  • String replacement on a whole text file in Python 3.x?

    - by SkippyFire
    How can I replace a string with another string, within a given text file. Do I just loop through readline() and run the replacement while saving out to a new file? Or is there a better way? I'm thinking that I could read the whole thing into memory, but I'm looking for a more elegant solution... Thanks in advance

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  • Where is python Language used

    - by Mirage
    I am a web developer and usually use php/JS/mysql. I have heard lot about python. I have no idea where is python used and why it is used. Just like php/asp/cold fusion/.net/ are used to build websites C, C++ , Java are used to build software or desktop apps Where does python stands from those langages WHich is the thing whic can be done by python but not with those common languages

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  • Carrot (Python) [errno 10054] An existing connection was forcibly closed by the remote host

    - by Meditation
    Hi all, We are using Carrot in our Python project. I wrote a Python script acting as the consumer of the message queue. I invoked this Python script using command line shell in Windows 7 as python consumer.py However, after a while, the running session was aborted and the error is: [errno 10054] An existing connection was forcibly closed by the remote host The producer session is still running fine on the Linux server. Just wondering how can I fix this and have a long running consumer session on Windows Thanks in advance.

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  • Is there a way to accept '%' as part of input that works both in python 2.6 & 3.0?

    - by bug11
    In 2.6, if I needed to accept input that allowed a percent sign (such as "foo % bar"), I used raw_input() which worked as expected. In 3.0, input() accomplishes that same (with raw_input() having left the building). As an exercise, I'm hoping that I can have a backward-compatible version that will work with both 2.6 and 3.0. When I use input() in 2.6 and enter "foo % bar", the following error is returned: File "<string>", line 1, in <module> NameError: name "foo" is not defined ...which is expected. Anyway to to accomplish acceptance of input containing a percent sign that works in both 2.6 and 3.0? Thx.

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