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• How do I translate Ruby's IO.popen calls into Python's subprocess.Popen calls?

  - by Tom Morris

  I've read the documentation and I've tried lots of things in the REPL, and Googled, but I can't for the life of me understand how subprocess.Popen works in Python. Here is some Ruby code I am using: IO.popen("some-process") do |io| while(line = io.gets) # do whatever with line end end How do I translate this into Python using subprocess.Popen?

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• Python code to use a regular expression to make sure a string is alphanumeric plus . - _

  - by Warlax

  Hi, I looked and searched and couldn't find what I needed although I think it should be simple (if you have any Python experience, which I don't). Given a string, I want to verify, in Python, that it contains ONLY alphanumeric characters: a-zA-Z0-9 and . _ - examples: Accepted: bill-gates Steve_Jobs Micro.soft Rejected: Bill gates -- no spaces allowed [email protected] -- @ is not alphanumeric I'm trying to use: if re.match("^[a-zA-Z0-9_.-]+$", username) == True: But that doesn't seem to do the job...

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• What do I use for a max-heap implementation in Python?

  - by Douglas Mayle

  Python includes the heapq module for min-heaps, but I need a max heap. What should I use for a max-heap implementation in Python?

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• Why doesn't Python require exactly four spaces per indentation level?

  - by knorv

  Whitespace is signification in Python in that code blocks are defined by their indentation. Furthermore, Guido van Rossum recommends using four spaces per indentation level (see PEP 8: Style Guide for Python Code). What was the reasoning behind not requiring exactly four spaces per indentation level as well? Are there any technical reasons? It seems like all the arguments that can be made for making whitespace define code blocks can also be used to argument for setting an exact whitespace length for one indentation level (say four spaces).

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• How do I request and process JSON with python?

  - by sa125

  Hello - I am trying to send a GET request to a URL that I know returns data in the form of JSON using python. I would like to know how to send this request to http://someurl/path/to/json, and how to parse it - preferably to a python dict. thanks :)

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• How can I keep the system environments set by a bat file, which called by a python script

  - by Lucy

  I call .bat files in Python to set system environments, and check the system environments were set properly, and then back to run python code, the system environments are changed back to original. How can I solve this problem? I really appreciate any clues/answers Thanks in advanced

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• Once I know the basic elements and syntax of Python, what should I do?

  - by Wyatt

  Well, I have read several user guides and watched dozens and dozens of video tutorials on how to program with Python, and feel pretty confident about writing simple applications for it. My main point in my question is, where would I be able to learn more advanced programming knowledge about Python?

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• How do I parse a VCard to a Python dictionary?

  - by lecodesportif

  I'm trying to figure out how to parse a VCard to a Python dictionary using VObject. How do I convert vobj=vobject.readOne(vcard) into a Python dict? Sorry for asking such a basic question but I'm a beginner.

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• Why can't I find `len(list)` in Python?

  - by FarmBoy

  I'm new to Python. I have a method that begins: def foo(self, list): length = len(list) I've called len() successfully in other cases, but here I get: TypeError: object of type 'type' has no len() How do I convince Python that this object passed in is a list? What am I missing?

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• How to give extra arguments for the Python itertools.ifilter function?

  - by Peter Smit

  In python I have the following function: def is_a_nice_element(element, parameter): #do something return True or False Now I would like to filter a list with this function as predicate, giving a fixed parameter. Python has the itertools.ifilter function, but I can't figure out how to pass the parameter. Is this possible? If not, how can I solve this problem?

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• What development tools should I use to develop in python?

  - by Spines

  What tools should I use to develop python applications in? I come from a C# background where I use Visual Studio, what is the Visual Studio of the python world?

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• Running a python script on all the files in a directory.

  - by S1syphus

  I have a Python script that reads through a text csv file and creates a playlist file. However I can only do one at a time, like: python playlist.py foo.csv foolist.txt However, I have a directory of files that need to be made into a playlist, with different names, and sometimes a different number of files. So far I have looked at creating a txt file with a list of all the names of the file in the directory, then loop through each line of that, however I know there must be an easier way to do it.

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• Is there a function in C that does the same as raw_input in Python?

  - by Rami Jarrar

  Is there a C function that does the same as raw_input in Python? #in Python:: x = raw_input("Message Here:") How can I write something like that in C?

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• Is it possible to write an IM server in python? (be able to handle the heavy connections)

  - by Kyle

  Hi all, i wanna write an IM server in python, but i'm not sure if python can handle the heavy connections? Thanks in advance.

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• Any downsides to UPX-ing my 32-bit Python 2.6.4 development environment EXE/PYD/DLL files?

  - by Malcolm

  Are there any downsides to UPX-ing my 32-bit Python 2.6.4 development environment EXE/PYD/DLL files? The reason I'm asking is that I frequently use a custom PY2EXE script that UPX's copies of these files on every build. Yes, I could get fancy and try to cache UPXed files, but I think a simpler, safer, and higher performance solution would be for me to just UPX my Python 2.6.4 directory once and be done with it. Thoughts? Malcolm

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• Python : get all exe files in current directory and run them?

  - by Maciek

  Hey all, First of all this is not homework, I'm in a desperate need for a script that will do the following, my problem is, I've never had to deal with python before so I barely know how to use it - and I need it to launch unit tests in TeamCity via a commandline build runner What I need exactly is : a *.bat file that will run the script a python script that will : get all *_test.exe files in the current working directory run all the files which were the result of the search Best regards

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• How do I watch a folder for changes and when changes are done using Python?

  - by yakov

  i need to watch a folder for incoming files. i did that with the following help: http://stackoverflow.com/questions/182197/how-do-i-watch-a-file-for-changes-using-python the problem is that the files that are being moved are pretty big (10gb) and i want to be notified when all files are done moving. i tried comparing the size of the folder every 20 seconds but the file shows its correct size even tough windows shows that it is still moving. i am using windows with python

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• Is there a function in C do the same like raw_input in Python and ... ???

  - by Rami Jarrar

  Hi, i wonder if there are a C function that do same like raw_input function in Python ?? #in Python:: x = raw_input("Message Here:") or how i could make one like that in C ?? :)

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• What are your "must-have" Python Packages for Finance?

  - by srid

  With the recent SEC proposal requiring that most Asset-Backed Securities issuers file a python computer program to document the flow of funds (or waterfall) provisions of the transaction, I thought it timely to ask what you thought the "Must-Have" Python Packages for Finance would be. PS: apart from answering here, please also consider answering this survey.

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• What is the most shocking case in the python standard library where the API doesn't follow the PEP8

  - by ivo

  What is the most shocking case in the python standard library where the API doesn't follow the PEP8 recommendations? Please one answer per violation, specifying the python version, and the justification for the PEP8 violation (if existent).

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• Creating a list in Python- something sneaky going on?

  - by GlenCrawford

  Apologies if this doesn't make any sense, I'm very new to Python! From testing in an interpreter, I can see that list() and [] both produce an empty list: >>> list() [] >>> [] [] From what I've learned so far, the only way to create an object is to call its constructor (__init__), but I don't see this happening when I just type []. So by executing [], is Python then mapping that to a call to list()?

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• Is it possible to make an OS in python?

  - by None

  I was just wondering if it was possible to make an operating system in python. Nothing fancy. Maybe not even a "real" operating system with a kernel and all. Just a python program that is run when someone inserts the disc containing it that will make a fullscreen display on top of the installed os.

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• Has anyone here tried using the iSeries Python port?

  - by nearly_lunchtime

  I found http://www.iseriespython.com/, which is a version of Python for the iSeries apparently including some system specific data access classes. I am keen to try this out, but will have to get approval at work to do so. My questions are: Does the port work well, or are there limits to what the interpreter can handle compared with standard Python implementations? Does the iSeries database access layer work well, creating usable objects from table definitions?

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• Is a variable swap guaranteed to be atomic in python?

  - by dhruvbird

  With reference to the following link: http://docs.python.org/faq/library.html#what-kinds-of-global-value-mutation-are-thread-safe I wanted to know if the following: (x, y) = (y, x) will be guaranteed atomic in cPython. (x and y are both python variables)

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• Do you know of any python mapreduce ready clustering libraries?

  - by user319045

  Do you know of any python mapreduce ready clustering libraries? I have found some good libraries in Java (http://lucene.apache.org/mahout/), I'd prefer to use python though.

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