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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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  • 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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  • How to condense a path in C++ using Boost?

    - by pdillon3
    Does Boost offer a simple way to condense a path such as /foo/bar/../bar or /foo/../. into the absolute path it refers to. /foo/bar/../bar -- /foo/bar /foo/../. -- / The goal is to combine base_path and rel_path with boost::filesystem::complete(rel_path, base_path) into a path into /foo/bar/with/no/dots. thanks

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  • Python inter-computer communication.

    - by matt1024
    This whole topic is way out of my depth, so forgive my imprecise question, but I have two computers both connected to one LAN. What I want is to be able to communicate one string between the two, by running a python script on the first (the host) where the string will originate, and a second on the client computer to retrieve the string. What is the most efficient way for an inexperienced programmer like me to achieve this?

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  • python tracing a segmentation fault

    - by pygabriel
    Hi, I'm developing C extensions from python ad I obtain some segfaults (inevitable during the development...). I'm searching a way to display at which line of code the segfault happens (an idea is like tracing every single line of code), how I can do that?

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  • Python interpreter with Linux Screen

    - by Unknown
    I was working with Python with a Linux terminal screen. When I typed: help(somefunction) It printed the appropriate output, but then my screen was stuck, and at the bottom of the terminal was "(end)". How do I get unstuck? Thanks in advance.

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  • How do I set a property in python using its string name

    - by dave
    Hey, here's a dumb question: how can I set an object property given its name in a string. I have a dictionary being passed to me and I wish to transfer its values into namesake properties using code like this: for entry in src_dict: if entry.startswith('can_'): tgt_obj[entry] = src_dict_profile[entry] I'm still a bit of a noob with Python so would appreciate some help. - dave.

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  • CAC Client Application Authentication in Python

    - by Präriewolf
    I am building a python application to pull data from a website. The application has to authenticate(HTTPS/SSL) with a CAC card and pin in order to make requests. Am I correct in my assumptions that you can't retrieve the private key from a CAC card, and am therefore stuck using a PKCS #11 Wrapper like PyKCS? Any tips or resources for going about this?

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  • Find Hyperlinks in Text using Python (twitter related)

    - by TimLeung
    How can I parse text and find all instances of hyperlinks with a string? The hyperlink will not be in the html format of <a href="http://test.com">test</a> but just http://test.com Secondly, I would like to then convert the original string and replace all instances of hyperlinks into clickable html hyperlinks. I found an example in this thread: Easiest way to convert a URL to a hyperlink in a C# string? but was unable to reproduce it in python :(

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  • How are python pages coded and what can the language be compared to? [closed]

    - by avon_verma
    I have a few questions about python I've seen many pages like these on Google http://mail.google.com/support/bin/answer.py?answer=6583 https://www.google.com/adsense/support/bin/topic.py?topic=13488 ...that have .py extensions. 1: Are pages like these built on pure python code, but printing out html like print "<div etc..." or like the typical asp,jsp,php type of pages with html pages and embedded python code like: <html> <% some python code %> </html> 2: What is python mainly used for making? windows apps or web or .. ? 3: Are ruby and perl also similar to python?

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  • String literals in python

    - by kjakeb
    Hello, Is there a way to declare a string variable in python such that everything inside of it is automatically escaped, or has its literal character value? I'm NOT asking how to escape the quotes with slashes, that's obvious. What I'm asking for is a general purpose way for making EVERYTHING in a string literal so that I don't have to manually go through and escape everything for very large strings. Anyone know of a solution? Thanks!

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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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  • Good practice of using list of function in Python

    - by riskio
    I am pretty new to python and I discovered by myself that I can create a list of function and call with a for loop. example: def a(args): print "A" def b(args): print "B" def c(args): print "C " + str(args) functions = [a,b,c] for i in functions: i(1) So, my question is: is there any good practice or elegant way to use list of functions and what is a good use of all this? (do have a particular name the "list of functions"?) thank you

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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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  • Python process will not exit

    - by oneself
    Hi, I'm use nosetests to run some tests. However, after the tests have finished running, the nosetests process just sits there, and will not exit. Is there anyway to diagnose this? Does Python have a facility similar to sending Java a kill -QUIT which will print a stack trace?

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  • Converting a string into a list in Python

    - by Sam
    I have a text document that contains a list of numbers and I want to convert it to a list. Right now I can only get the entire list in the 0th entry of the list, but I want each number to be an element of a list. Does anyone know of an easy way to do this in Python? 1000 2000 3000 4000 to ['1000','2000','3000','4000']

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