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• How to insert / retrieve a file stored as a BLOB in a MySQL db using python

  - by Phage

  I want to write a python script that populates a database with some information. One of the columns in my table is a BLOB that I would like to save a file to for each entry. How can I read the file (binary) and insert it into the DB using python? Likewise, how can I retrieve it and write that file back to some arbitrary location on the hard drive?

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• What happens when I instantiate class in Python?

  - by Konstantin

  Could you clarify some ideas behind Python classes and class instances? Consider this: class A(): name = 'A' a = A() a.name = 'B' # point 1 (instance of class A is used here) print a.name print A.name prints: B A if instead in point 1 I use class name, output is different: A.name = 'B' # point 1 (updated, class A itself is used here) prints: B B Even if classes in Python were some kind of prototype for class instances, I'd expect already created instances to remain intact, i.e. output like this: A B Can you explain what is actually going on?

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• SQL-wrappers (activerecord) to recommened for python?

  - by Horace Ho

  is there an activerecord (any similar SQL-wrapper) for python? which is good for: used in a server-side python script light-weight supports MySQL what I need to do: insert (filename, file size, file md5, the file itself) into (string, int, string, BLOB) columns if the same file (checksum + filename) does not exist in db thx

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• jquery-like HTML parsing in Python?

  - by Roy Tang

  Is there any Python library that allows me to parse an HTML document similar to what jQuery does? i.e. I'd like to be able to use CSS selector syntax to grab an arbitrary set of nodes from the document, read their content/attributes, etc. The only Python HTML parsing lib I've used before was BeautifulSoup, and even though it's fine I keep thinking it would be faster to do my parsing if I had jQuery syntax available. :D

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• Python script names in tasklist

  - by Richard

  I am wondering, is there a way to change the name of a script so that it is not called "python.exe" in the tasklist. The reason I am asking is that I am trying to make a batch file that run's a python script. I want the batch file to check to see if the script is already running. if the script is already running then the batch file will do nothing. Thanks

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• Downloading a web page and all of its resource files in Python

  - by Mark

  I want to be able to download a page and all of its associated resources (images, style sheets, script files, etc) using Python. I am (somewhat) familiar with urllib2 and know how to download individual urls, but before I go and start hacking at BeautifulSoup + urllib2 I wanted to be sure that there wasn't already a Python equivalent to "wget --page-requisites http://www.google.com". Specifically I am interested in gathering statistical information about how long it takes to download an entire web page, including all resources. Thanks Mark

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• Inserting a WAV at a certain point in an audio file using python

  - by Onion

  My problem is the following: I have a 2-minute long WAV file, and my aim is to insert another WAV file (7 seconds long), at a certain point in the first WAV file (say, 0:48), essentially combining the two WAVs, using python. Unfortunately I haven't been able to figure out how to do that, and was wondering if there was some obvious solution that I was missing, or if it is even feasible to do with python. Is there perhaps a library available that might provide a solution? Thanks to all in advance.

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• information hiding in python

  - by ali

  in python tutorial added that python cannot hide its attributes from other classes. some thing such as private data in C++ or java..But also i know that we can use _ or __ to set some variables as privated one but it is not enogh. I think it is a week if it is not any thing to do it.

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• Calculating time until 1st or 15th of the month in python

  - by pmilb

  I'm trying to write a little budget program in python. This is my first program I'm writing to learn python. The first step is to calculate how many days until either the 1st or 15th (paydays) depending on today's date. Can someone help me out a little?

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• Beginning python for the web

  - by Josh K

  I'm looking for a nice tutorial or framework for developing Python written web applications. I've done lots in PHP, but very little in Python or Ruby and figured I'd start with the first one alphabetically.

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• Getting two characters from string in python

  - by Adomas

  hi, how to get in python from string not one character, but two? I have: long_str = 'abcd' for c in long_str: print c and it gives me like a b c d but i need to get ab cd I'm new in python.. is there any way?

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• Advantages of using *args in python instead of passing a list as a parameter

  - by apple_pie

  Hello, python newbie here. I'm going through python and I was wondering what are the advantages of using the *args as a parameter over just passing a list as a parameter, besides aesthetics?

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• reading/parsing xls files with python

  - by qrbaQ

  Could someone provide the best way to read xls files with python (not csv files). if there a built in package which supported by default with python to this this task ?

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• python print end=' '

  - by Hath

  i have this python script where i need to run 'gdal_retile.py' but i get this an exception on this line: if Verbose: print(Building internam Index for %d tile(s) ..." % len(inputTiles), end=' ') the end='' is invalid syntax just curious as to why.. and what the author probably meant to do. I'm new to python if you haven't already guessed.

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• how to create application(exe) from python script for linux

  - by Apache

  hi expert, i'm newbie for python programming, i'm having a .py file, now what shall i do so i can create an application from .py file and it can be istall and run in any linux pc, i try to packaging it but its just create .tar file where i need python to run it, is it any to do so, thanks

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• how to create a CFuncType in python

  - by manson54

  hi, I need to pass a callback function that is CFuncType (ctypes.CFUNCTYPE or ctypes.PYFUNCTYPE...). How can I cast a python function to CFuncType or how can I create a CFuncType function in python.

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• Python: Set window focus on terminal

  - by janoliver

  Hey, I have a python application that opens some plots for me and then asks the user for input. The problem is, that after opening the plot, the focus isn't on the terminal anymore, so you have to click or tab to it manually. I would like to set the focus to the terminal window with python - is that possible? I'm using gnuplot.py, maybe there is an option to open the plot in the background? Thanks!

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• Python | How to send a JSON response with name assign to it

  - by MMRUser

  How can I return an response (lets say an array) to the client with a name assign to it form a python script. echo '{"jsonValidateReturn":'.json_encode($arrayToJs).'}'; in this scenario it returns an array with the name(jsonValidateReturn) assign to it also this can be accessed by jsonValidateReturn[1],so I want to do the same using a python script. I tried it once but it didn't go well array_to_js = [vld_id, vld_error, False] array_to_js[2] = False jsonValidateReturn = simplejson.dumps(array_to_js) return HttpResponse(jsonValidateReturn, mimetype='application/json') Thanks.

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• python on 32 bit

  - by Mponnada

  Hi I am running Windows XP, on 32bit. How do I install python? When I run the installation file, it gives me an error saying "installation package not supported by processor type" does python need 64 bit to execute?

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• Python package name conventions

  - by deamon

  Is there a package naming convention for Python like Java's com.company.actualpackage? Most of the time I see simple, potentially colliding package names like "web". If there is no such convention, is there a reason for it? What do you think of using the Java naming convention in the Python world?

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• Sending messages between two Python servers

  - by Will

  I have two servers - one Django, the other likely to be written in Python - and one is putting 'tasks' into a database and another is processing these tasks. They share a database, but I want the processor to react quickly to new tasks rather than polling periodically. Are there any straightforward ways for two Python servers to talk to one another, or does the task processor have to have web-hooks or something? It feels there ought to be a blessed way to do this...

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• What's the best way to use python-syntax config files (in python of course)?

  - by Gabe

  My config file is really just a big python dict, but I have many config files to run different experiments and I want to 'import' a different one based on a command line option. Instinctively I want to do import ConfigFileName where ConfigFileName is a string with the config file's python package name in it... but that doesn't work. Any ideas?

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• why am i getting an error SyntaxError : invalid syntax for this code

  - by eragon1189

  This is a code in python which calculates f (x) =? ((-1)*x)/(x*x+n*n) n from 1 to infinite.... correct to 0.0001, for the range 1 < x < 100 in steps of 0.1.But i am getting an syntax error,as i am new to programming in python... from scipy import * from matplotlib.pyplot import * x=arange(0.1,100,0.1) f=zeros(len(x)) s=-1 for n in range (1,10000): t=s*x/(x*x+n*n) f +=t s =-s if max(abs(t))< 1e-4 break for xx in c_[x,f]: print "%f %f" % (xx[0],xx[1])

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• getting previously typed commands in python

  - by womble

  I'm using python 2.5 in windows on a macbook pro with IDLE. How do I get previously typed commands in the python shell? In other operating systems I've managed to do this using 'ctrl' + 'up arrow' or a similar combination. I've tried all likely combinations without success. Thanks.

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• multi threading python/ruby vs java?

  - by fayer

  i wonder if the multi threading in python/ruby is equivalent to the one in java? by that i mean, is it as efficient? cause if you want to create a chat application that use comet technology i know that you have to use multi threading. does this mean that i can use python or ruby for that or is it better with java? thanks

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