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  • Python PLY zero or more occurrences of a parsing item

    - by None
    I am using Python with PLY to parse LISP-like S-Expressions and when parsing a function call there can be zero or more arguments. How can I put this into the yacc code. This is my function so far: def p_EXPR(p): '''EXPR : NUMBER | STRING | LPAREN funcname [EXPR] RPAREN''' if len(p) == 2: p[0] = p[1] else: p[0] = ("Call", p[2], p[3:-1]) I need to replace "[EXPR]" with something that allows zero or more EXPR's. How can I do this?

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  • Customized command line parsing in Python

    - by Moshe
    I'm writing a shell for a project of mine, which by design parses commands that looks like this: COMMAND_NAME ARG1="Long Value" ARG2=123 [email protected] My problem is that Python's command line parsing libraries (getopt and optparse) forces me to use '-' or '--' in front of the arguments. This behavior doesn't match my requirements. Any ideas how can this be solved? Any existing library for this?

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  • Accessing MySQL server via VPN in python

    - by user210481
    Hi I have a MySQL server that I need access through a VPN. I use MySQLdb package to access MySQL server in Python. When I can access the server without VPN, it works fine, but when I'm at certain locations, I need to connect through VPN. My computer is connected to the VPN and I can access the database through PHPMyAdmin, but MySQLdb gives me an error message: OperationalError: (2003, "Can't connect to MySQL server on 'MY_IP' (10061)") Any ideas on why it's not working? Thanks

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  • Backup of folder + database - Python

    - by RadiantHex
    Hi there, I feel like this is quite delicate, I have various folders whith projects I would like to backup into a zip/tar file, but would like to avoid backing up files such as pyc files and temporary files. I also have a Postgres db I need to backup. Any tips for running this operation as a python script? Also, would there be anyway to stop the process from hogging resources in the process? Help would be very much appreciated.

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  • Abstract attributes in Python

    - by deamon
    What is the shortest / most elegant way to implement the following Scala code with an abstract attribute in Python? abstract class Controller { val path: String } A subclass of Controller is enforced to define "path" by the Scala compiler. A subclass would look like this: class MyController extends Controller { override val path = "/home" }

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  • How to print source code lines in python logger

    - by anon
    Is there some relatively simple way to programmatically include source code lines to python logger report. For example... import logging def main(): something_is_not_right = True logging.basicConfig(level=logging.DEBUG, format=('%(filename)s: ' '%(levelname)s: ' '%(funcName)s(): ' '%(lineno)d:\t' '%(message)s') ) if something_is_not_right == True: logging.debug('some way to get previous line of source code here?') So that output would look like this. example.py: DEBUG: main(): 14: if something_is_not_right == True:

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  • Time Calculation in Python

    - by user343934
    Hi everyone, I have two python cgi pages (index, display), what i need to do is calculate time frame between the execution. Work flow: Index.py (submit) After submit it redirect to display.py page display.py page has got class with execute(),display() &init_main() functions In init_main() i have created class object which access to above functions I need to calculate time interval between the submit (index.py) to execute() end, so i can show user how much time does different weighted file takes on real time. Hoping to see your suggestions Thanks

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  • Importing Python modules without installing - Sybase ASE

    - by Michael
    I need to use the Sybase Python module but our SA's won't install because it's not in the repo's. I've downloaded it and placed it on the box and would just like to 'import' or 'include' the module without installing it first. - Is this possible? From the looks of it (Sybase ASE) it needs some type of compilation before use. Is it possible for this type of work around?

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  • detect the most used colour in an image using python

    - by sree01
    Hi, I want to find the most used colour in an image using python. for example detect the colour of the object in the following image http://www.shopcrazy.com.ph/wp-content/images/2007/02/shiny-bags-01.jpg. how to detect the base colour from the RGB codes(example - red in the above image).

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  • Get screenshot on Windows with Python?

    - by Zachary Brown
    Hello, I am creating a Beta Testers reporting module so they can send in thier comments on my software, but I would like to have the option to include a screenshot with the report. How do I take a screenshot of the screen with Python on Windows? I have found several examples on Linux, but haven't had much luck on Windows.

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  • Python: saving and loading a class definition

    - by Peterstone
    Hi! I am interested in saving and load objects using the pickle module as you can read in a question I asked before: Python: Errors saving and loading objects with pickle module Someone commment: 1, In an other way: the error is raise because pickle wanted to load an instance of the class Fruits and search for the class definition where it was defined, but it didn't find it so it raise the error Now I want to save and load a class definition in order to solve the problem I describe in the question mentioned before. Thank you so much!

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  • Why does this python code work?

    - by Int-0
    I have written a simple python module, it has this code: _log = logging.getLogger("mymodule") _started = False def set_log_level(level): _log.setLevel(level) if not _started: _hdlr = logging.FileHandler('mymodule.log') When I call set_log_level() program fails because symbol _started is not found. It is normal because global _started is missing in the method. But my question is: symbol _log has the same visibility as _started, so why does this symbol can be found? BR, // Toby

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  • Exact cin equivalent function in python

    - by gkt.pro
    Suppose user enter this string at terminal 123 456 456 //then hit enter How do I scan these three (could be more) numbers in different variables in python Could be something like this: for i in range(1,n) m[i]=#WHAT FUNCTION SHOULD I PUT HERE In c++ we can easily use cin>>m[i] inside above loop to scan the variables. If i use input() or raw_input() , they would scan whole line in single variable.

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  • why is there {Raw,Safe,}Configparser in Python 3

    - by Tshepang
    Am surprised there's 3 different forms: RawConfigParser, SafeConfigParser and ConfigParser. I read the differences but why isn't everyone using SafeConfigParser, since it seems, well, safe? I can understand that in the case for Python 2 that the other two were kept for backward compatibility.

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  • in Python find number of same elements in 2 lists

    - by John
    Hi, In Python if I have 2 lists say: l1 = ['a', 'b', 'c', 'd'] l2 = ['c', 'd', 'e'] is there a way to find out how many elements they have the same. In the case about it would be 2 (c and d) I know I could just do a nested loop but is there not a built in function like in php with the array_intersect function Thanks

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