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When I ctrl click a builtin function in my IDE I noticed I usually get sended to an init file which holds the function but it just returns the function again.. It states a vague doc string like 'original footprint unknown'
Where do I find the real functions ?
For example where is print_function
the specific example, print is defined in C, in the bltinmodule.c: specifically.
http://hg.python.org/cpython/file/3.3/Python/bltinmodule.c#l1518
More generally, functions implemented in C have no equivalent to the source file you would read in python; the C code is compiled into binary machine code, and no reference to where that bit of code might have come from is (usually) retained in the result; and even if there was, it's unlikely that you happen to have the source code installed in a place your IDE is likely to find it, unless you built it yourself, with debug symbols, and are running the C executable process in that ide's debugger.
Usually in the same directory where that file is. (Which I can't possibly know.)
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I'm Working on a program that takes in text from the user and then implements functionalities in the backend, kind of like an interpreter, I have the parser working amazingly in python but some of the backend capabilities I feel would do great on c. I have looked into CPython but I don't seem to understand how to do it if it's even possible at all. I'm just a beginner, if someone could guide that will be very helpful.
CPython is just an implementation of Python in the C programming language. If you want to incorporate C code, you can write extension modules documented here.
Check out this StackOverflow post as well.
Alternatively, write a C program, compile it, and then call it via the subprocess module documented here.
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I am running a python script from cgi-bin that needs to pass a list to jython so that it can use some library files do its thing then pass results back to python. Any suggestions on how I can accomplish this task will be much appreciated.
I'm using Python 2.7.5 and jython 2.7.1. appreciate any assistance or response.
There are several ways to pass data between scripts. Most of them are independent from used programming language. Here are some examples:
Save result data to a file and read it by another script
Call another script with a result data as execution arguments (not recommended for a lot of data)
You can use stdin and stdout (piping) data from one script to another
Another solution can be implemented by the fact that Jython is basically compatible with CPython (the "reference" implementation of Python, written in C). There are some limitations, but you may consider / try to import your python scripts in jython. Here and there you can read more about other methods.
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I am new to multi-threaded programming in python.
Can someone tell me whether os.system("ls") in python and exec("ls") call in "C" are doing the same ?
Please tell me about the similarities and dissimilarities as well.
In C, exec(whatever) replaces the current process's code with the code from whatever. Thus, it never returns. You can do the same in Python with os.execv and friends -- see https://docs.python.org/2/library/os.html#process-management .
os.system(whatever), on the other hands, forks the current process, execs whatever in the subprocess, waits for it to end, then returns. So, it's the same as system(whatever) is in C: a simple layer on top of fork, exec, and wait system calls (in Unix-like systems; simulated by other means in non-Unix-based systems, of which I believe the only one around in substantial numbers these days is Microsoft Windows).
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In a Windows 7 system you can right-click the sort columns to look at the details you want to view for a file and you get the following:
Question: Is there a way to access all of the attributes on that list for a given file using Python?
This is a bit long for a comment.
You are not likely to get a good answer because Microsoft makes this way too complicated, and their documentation on this topic is some of the worst that they have.
Everything is wrapped up in COM interfaces, and you really need the SDK installed to get all of the headers file needed to access these interfaces from a C style API.
To understand how it really works, you really need to start the Property System Overview
You will also want to read Property System Developers Guid
There is one C language answer that I know of for this topic on S/O, though clearly there could be others.
I know it is not a real answer, and it is certainly not Python -- but if you have the real motivation to dig into this, hopefully this is at least a little helpful.
Also not that these extended properties are poorly supported, and tend to disappear under many common usage patterns since they are not really part of the file -- e.g., copy the file using ftp -- lose the extended file attributes.
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I have a huge C file (~100k lines) which I need to be able to parse. Mainly I need to be able to get details about individual fields of every structure (like field name and type for every field in the structure) from its definition. Is there a good(open source, which i can use in my code) way to do this already? Or should I write my own parser for this. If I have to write my own, can anyone suggest a good place to start? I have never worked with python before.
Thanks
Take a look at this link for an extensive list of parsing tools available for Python. Specifically, for parsing c code, try the pycparser
The right way to do this is almost certainly to interface with the front-end of an existing compiler, such as gcc, then work with the intermediate representation, rather than attempting to create your own parser, in any language.
However, pycparser, as suggested by Dhara might well be a good substitute, and definitely better than any attempt to roll your own.