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  • Pycassa | Python

    - by MMRUser
    Is anyone having experience working with pycassa I have a doubt with it. How do I get all the keys that are stored in the database? well in this small snippet we need to give the keys in order to get the associated columns (here the keys are 'foo' and 'bar'),that is fine but my requirement is to get all the keys (only keys) at once as Python list or similar data structure. cf.multiget(['foo', 'bar']) {'foo': {'column1': 'val2'}, 'bar': {'column1': 'val3', 'column2': 'val4'}} Thanks.

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  • Python constructor does weird things with optional parameters

    - by christangrant
    Can you help me understand of the behaviour and implications of the python __init__ constructor. It seems like when there is an optional parameter and you try and set an existing object to a new object the optional value of the existing object is preserved and copied. Ok that was confusing... so look at an example I concocted below. In the code below I am trying to make a tree structure with nodes and possibly many children . In the first class NodeBad, the constructor has two parameters, the value and any possible children. The second class NodeGood only takes the value of the node as a parameter. Both have an addchild method to add a child to a node. When creating a tree with the NodeGood class, it works as expected. However, when doing the same thing with the NodeBad class, it seems as though a child can only be added once! The code below will result in the following output: Good Tree 1 2 3 [< 3 >] Bad Tree 1 2 2 [< 2 >, < 3 >] Que Pasa? Here is the Example: #!/usr/bin/python class NodeBad: def __init__(self, value, c=[]): self.value = value self.children = c def addchild(self, node): self.children.append(node) def __str__(self): return '< %s >' % self.value def __repr__(self): return '< %s >' % self.value class NodeGood: def __init__(self, value): self.value = value self.children = [] def addchild(self, node): self.children.append(node) def __str__(self): return '< %s >' % self.value def __repr__(self): return '< %s >' % self.value if __name__ == '__main__': print 'Good Tree' ng = NodeGood(1) # Root Node rootgood = ng ng.addchild(NodeGood(2)) # 1nd Child ng = ng.children[0] ng.addchild(NodeGood(3)) # 2nd Child print rootgood.value print rootgood.children[0].value print rootgood.children[0].children[0].value print rootgood.children[0].children print 'Bad Tree' nb = NodeBad(1) # Root Node rootbad = nb nb.addchild(NodeBad(2)) # 1st Child nb = nb.children[0] nb.addchild(NodeBad(3)) # 2nd Child print rootbad.value print rootbad.children[0].value print rootbad.children[0].children[0].value print rootbad.children[0].children

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  • The confusion on python encoding

    - by zhangzhong
    I retrieved the data encoded in big5 from database,and I want to send the data as email of html content, the code is like this: html += """<tr><td>""" html += """unicode(rs[0], 'big5')""" # rs[0] is data encoded in big5 I run the script, but the error raised: UnicodeDecodeError: 'ascii' codec can't decode byte...... However, I tried the code in interactive python command line, there are no errors raised, could you give me the clue?

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  • Should Python 2.6 on OS X deal with multiple easy-install.pth files in $PYTHONPATH?

    - by ahd
    I am running ipython from sage and also am using some packages that aren't in sage (lxml, argparse) which are installed in my home directory. I have therefore ended up with a $PYTHONPATH of $HOME/sage/local/lib/python:$HOME/lib/python Python is reading and processing the first easy-install.pth it finds ($HOME/sage/local/lib/python/site-packages/easy-install.pth) but not the second, so eggs installed in $HOME/lib/python aren't added to the path. On reading the off-the-shelf site.py, I cannot for the life of me see why it's doing this. Can someone enlighten me? Or advise how to nudge Python into reading both easy-install.pth files? Consolidating both into one .pth file is a viable workaround for now, so this question is mostly for curiosity value.

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  • Memcache in python

    - by alex
    I want to memcache an xmldata using python,also needs to update the cache with the refreshed xmldata retreived from webserver,could any one help me with sample code.

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  • Python logger dynamic filename

    - by sharjeel
    I want to configure my Python logger in such a way so that each instance of logger should log in a file having the same name as the name of the logger itself. e.g.: log_hm = logging.getLogger('healthmonitor') log_hm.info("Testing Log") # Should log to /some/path/healthmonitor.log log_sc = logging.getLogger('scripts') log_sc.debug("Testing Scripts") # Should log to /some/path/scripts.log log_cr = logging.getLogger('cron') log_cr.info("Testing cron") # Should log to /some/path/cron.log I want to keep it generic and dont want to hardcode all kind of logger names I can have. Is that possible?

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  • getting Ceil() of Decimal in python?

    - by Gunjan
    Is there a way to get the ceil of a high precision Decimal in python? >>> import decimal; >>> decimal.Decimal(800000000000000000001)/100000000000000000000 Decimal('8.00000000000000000001') >>> math.ceil(decimal.Decimal(800000000000000000001)/100000000000000000000) 8.0 math rounds the value and returns non precise value

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  • running python from an android app

    - by Stacia
    Hi everyone, I am trying to run a python script through an application I've written. I found some pages which say that this piece of code is doing it, but I can't figure it out. http://code.google.com/p/android-scripting/source/browse/android/AndroidScriptingEnvironment/src/com/google/ase/locale/LocaleReceiver.java Can someone explain what is going on and how I can edit that to run an arbitrary script file in my project directory?

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  • C++ like iterators in python?

    - by uberjumper
    This might be a really dumb question, however i've looked around online, etc. And have not seen a solid answer. What i was wondering, is there a simple way to do something like this? lines = open('something.txt', 'r').readlines() for line in lines: if line == '!': # force iteration forward twice line.next().next() <etc> Is there an easy way to do that in python?

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  • Python SUDS - problem with sending a message encoded not in UTF-8

    - by bartekb
    I need to send a SOAP message (with Python SUDS) with strings encoded in 'iso-8859-2'. Does anybody know how to do it? SUDS raises the following exception when I invoke a method on a client with parameters encoded in 'iso-8859-2': File "/home/bartek/myenv/lib/python2.5/site-packages/suds/sax/text.py", line 43, in __new__ result = super(Text, cls).__new__(cls, *args, **kwargs) UnicodeDecodeError: 'ascii' codec can't decode byte 0xc5 in position 10: ordinal not in range(128)

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  • Python: try statement single line

    - by Brant
    Is there a way in python to turn a try/except into a single line? something like... b = 'some variable' a = c | b #try statement goes here Where b is a declared variable and c is not... so c would throw an error and a would become b...

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  • Downloading file with Python results in only 4.1kB

    - by Vlad Ogay
    I'm using simple code: import urllib2 response = urllib2.urlopen("http://www.mysite.com/getfile/4355") output = open('myfile.zip','wb') output.write(response.read()) output.close() The web-server is IIS + ASP.NET MVC 4 It returns FileResult wrapping a zip-file with "application/octet-stream" content-type. The problem is that downloaded zip file is broken - only 4.1kB size, where it must be 24kB. When I type the url adress in web-browser directly - it downloads and opens fine. Could you please, suggest, what's wrong with my Python code?

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  • Python sock.listen(...)

    - by Ian
    All the examples I've seen of sock.listen(5) in the python documentation suggest I should set the max backlog number to be 5. This is causing a problem for my app since I'm expecting some very high volume (many concurrent connections). I set it to 200 and haven't seen any problems on my system, but was wondering how high I can set it before it causes problems.. Anyone know?

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  • Intercept method calls in Python

    - by eaigner
    Hi. I'm implementing a RESTful web service in python and would like to add some QOS logging functionality by intercepting function calls and logging their execution time and so on. Basically i thought of a class from which all other services can inherit, that automatically overrides the default method implementations and wraps them in a logger function. What's the best way to achieve this?

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  • How to write a large number of nested records in JSON with Python

    - by jamesmcm
    I want to produce a JSON file, containing some initial parameters and then records of data like this: { "measurement" : 15000, "imi" : 0.5, "times" : 30, "recalibrate" : false, { "colorlist" : [234, 431, 134] "speclist" : [0.34, 0.42, 0.45, 0.34, 0.78] } { "colorlist" : [214, 451, 114] "speclist" : [0.44, 0.32, 0.45, 0.37, 0.53] } ... } How can this be achieved using the Python json module? The data records cannot be added by hand as there are very many.

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