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python Programming Glossary: accumulatePython metaclasses: Why isn't __setattr__ called for attributes set during class definition? http://stackoverflow.com/questions/10762088/python-metaclasses-why-isnt-setattr-called-for-attributes-set-during-class on a metaclass which controls what object is used to accumulate attributes set within a class block before they're passed to.. that doesn't allow keys to be redefined and use that to accumulate your attributes from collections import MutableMapping class.. in the classblock which means the dict object used to accumulate attributes for the class block already exists by the time the..
Interface for modifying Windows environment variables from Python http://stackoverflow.com/questions/1085852/interface-for-modifying-windows-environment-variables-from-python These changes are permanent never reset by reboots and so accumulate through the life of the machine. Trying to compensate for this..
Generating Discrete random variables with various weights using SciPy or NumPy http://stackoverflow.com/questions/11373192/generating-discrete-random-variables-with-various-weights-using-scipy-or-numpy that returns weighted values it uses numpys digitize accumulate and random_sample . import numpy as np from numpy.random import.. def weighted_values values probabilities size bins np.add.accumulate probabilities return values np.digitize random_sample size bins.. 2.2 2.2 3.3 3.3 2.2 3.3 3.3 It works like this First using accumulate we create bins. Then we create a bunch of random numbers between..
Simple way to group items into buckets http://stackoverflow.com/questions/12720151/simple-way-to-group-items-into-buckets library.. although I was surprised a few weeks ago by accumulate so who knows what's lurking there these days ^ When I need this..
parsing math expression in python and solving to find an answer http://stackoverflow.com/questions/13055884/parsing-math-expression-in-python-and-solving-to-find-an-answer if c in operators #found an operator. Everything we've accumulated in `buff` is #a single number . Join it together and put it.. buff buff op_out.append c else #not an operator. Just accumulate this character in buff. buff.append c num_out.append ''.join..
Django template and the locals trick http://stackoverflow.com/questions/1901525/django-template-and-the-locals-trick to cut corners with locals is easier to avoid if you just accumulate those values into a suitable dictionary rather than assigning..
Generating weighted random numbers http://stackoverflow.com/questions/19871608/generating-weighted-random-numbers random probabilities 0.3 0.2 0.5 totals list itertools.accumulate probabilities def sample n random.uniform 0 totals 1 for i total.. return i If you don't have Python 3.2 you don't have the accumulate function you can fake it with an inefficient one liner if the..
How do I get a thread safe print in Python 2.6? http://stackoverflow.com/questions/3029816/how-do-i-get-a-thread-safe-print-in-python-2-6 from a single thread well one architecture would be to accumulate partial lines to thread local storage instead of actually writing..
Inverse Distance Weighted (IDW) Interpolation with Python http://stackoverflow.com/questions/3104781/inverse-distance-weighted-idw-interpolation-with-python multipliers for 1 distance p of the same shape as q stat accumulate wsum wn for average weights How many nearest neighbors should..
How can I use the python HTMLParser library to extract data from a specific div tag? http://stackoverflow.com/questions/3276040/how-can-i-use-the-python-htmlparser-library-to-extract-data-from-a-specific-div When we're in the sub tree rooted in a triggering tag we accumulate the data in self.data . The data at the end of the parse are.. the core points keep track of a count of nested tags and accumulate data into a list when the recording state is active . share..
Efficient way of parsing fixed width files in Python http://stackoverflow.com/questions/4914008/efficient-way-of-parsing-fixed-width-files-in-python itertools import izip_longest try from itertools import accumulate # added in Py 3.2 except ImportError def accumulate iterable.. import accumulate # added in Py 3.2 except ImportError def accumulate iterable 'Return running totals simplified version .' total.. def make_parser fieldwidths cuts tuple cut for cut in accumulate abs fw for fw in fieldwidths pads tuple fw 0 for fw in fieldwidths..
Compute a compounded return series in Python http://stackoverflow.com/questions/5515021/compute-a-compounded-return-series-in-python My goal is to carry over the last non zero return to the accumulate these compound returns. That is since the return at index i..
proper use of list comprehensions - python http://stackoverflow.com/questions/8695488/proper-use-of-list-comprehensions-python for side effects. Apart from the fact that they'd accumulate a bogus list and thus waste memory it's also confusing. I expect..
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