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python Programming Glossary: delhttp://stackoverflow.com/questions/1319763/key-ordered-dict-in-python truly willing to pay any performance hits for inserts and deletes which is the literal implication of the specs you express.. self.d self.L.append k self.sorted False self.d k v def __delitem__ self k del self.d k self.L.remove k def __iter__ self.. k self.sorted False self.d k v def __delitem__ self k del self.d k self.L.remove k def __iter__ self if not self.sorted..
How to empty a list in Python? http://stackoverflow.com/questions/1400608/how-to-empty-a-list-in-python the list not replaces the old label with a new empty list del l example l1 1 2 3 l2 l1 del l1 print l2 For the sake of completeness.. label with a new empty list del l example l1 1 2 3 l2 l1 del l1 print l2 For the sake of completeness slice assignment achieves..
Sorting text file by using Python http://stackoverflow.com/questions/14465154/sorting-text-file-by-using-python 37024469 160506001 264.0000000000 As you seen delimiter is . i would like to sort this text file by using python.. yield value try iterables i 0 next it except StopIteration del iterables i if not iterables raise share improve this answer..
Working with big data in python and numpy, not enough ram, how to save partial results on disc? http://stackoverflow.com/questions/16149803/working-with-big-data-in-python-and-numpy-not-enough-ram-how-to-save-partial-r full array you have to close the previous one first using del del a b numpy.memmap 'test.mymemmap' dtype 'float32' mode 'r.. array you have to close the previous one first using del del a b numpy.memmap 'test.mymemmap' dtype 'float32' mode 'r ' shape..
pandas: How do I split text in a column into multiple columns? http://stackoverflow.com/questions/17116814/pandas-how-do-i-split-text-in-a-column-into-multiple-columns has a string of text that I want to split by a specific delimiter. I was wondering if there is a simple way to do this using.. 36 1 12 1 1 13 37 1 13 Name Seatblocks dtype object In 48 del df 'Seatblocks' In 49 df.join s Out 49 CustNum CustomerName..
more efficient way to calculate distance in numpy? http://stackoverflow.com/questions/17527340/more-efficient-way-to-calculate-distance-in-numpy numpy.newaxis HHm.flatten numpy.newaxis R1 R1 R R1 del R1 print R1 t time.time t0 R.shape #11.7576191425 108225 10500.. measured_flat numpy.column_stack VVm.flatten HHm.flatten deltas precomputed_flat None measured_flat None #print time.time.. None measured_flat None #print time.time t0 deltas.shape # 5.861109972 108225 10500 2 R numpy.einsum 'ijk ijk..
Why do attribute references act like this with Python inheritance? http://stackoverflow.com/questions/206734/why-do-attribute-references-act-like-this-with-python-inheritance True second subclassthing 'was_false_in_base' True del first del second third subclassthing 'was_false_in_base' True.. second subclassthing 'was_false_in_base' True del first del second third subclassthing 'was_false_in_base' True Defining..
Fastest way to list all primes below N in python http://stackoverflow.com/questions/2068372/fastest-way-to-list-all-primes-below-n-in-python 0 0 0 int ceil sqrt N # inner functions definition def del_mult tk start step for k in xrange start len tk step tk k False.. if off 7 else prime const pos 1 if tmp 7 else 0 tmp const del_mult tmptk off start prime # 30k 11 if tk11 pos prime cpos 11.. off 11 else prime const pos 1 if tmp 11 else 0 tmp const del_mult tmptk off start prime # 30k 13 if tk13 pos prime cpos 13..
Solving embarassingly parallel problems using Python multiprocessing http://stackoverflow.com/questions/2359253/solving-embarassingly-parallel-problems-using-python-multiprocessing cur in buffer self.out_csvfile.writerow cur buffer cur del buffer cur cur 1 outfile.close def main argv cli_parser make_cli_parser..
Printing all instances of a class http://stackoverflow.com/questions/328851/printing-all-instances-of-a-class name x X x y X y for r in X.get_instances print r.name del y for r in X.get_instances print r.name In this case all the.. stored as a weak reference in a list. If you create and delete a lot of instances frequently you should clean up the list..
Python: How to “perfectly” override a dict http://stackoverflow.com/questions/3387691/python-how-to-perfectly-override-a-dict self self.__keytransform__ key value def __delitem__ self key return dict.__delitem__ self self.__keytransform__.. key value def __delitem__ self key return dict.__delitem__ self self.__keytransform__ key def __contains__ self key.. key value self.store self.__keytransform__ key value def __delitem__ self key del self.store self.__keytransform__ key def..
Simple Prime Generator in Python http://stackoverflow.com/questions/567222/simple-prime-generator-in-python # numbers # for p in D q D.setdefault p q .append p del D q q 1 Note that it returns a generator. share improve this..
Using Python Iterparse For Large XML Files http://stackoverflow.com/questions/7171140/using-python-iterparse-for-large-xml-files event elem in context print elem.xpath 'description text ' del context Unfortunately though this solution is still eating up.. func elem elem.clear while elem.getprevious is not None del elem.getparent 0 del context def process_element elem print.. while elem.getprevious is not None del elem.getparent 0 del context def process_element elem print elem.xpath 'description..
SQLite Performance Benchmark — why is :memory: so slow…only 1.5X as fast as disk? http://stackoverflow.com/questions/764710/sqlite-performance-benchmark-why-is-memory-so-slow-only-1-5x-as-fast-as-d 'foo.sqlite' load_mat conn_mem mat load_mat conn_disk mat del mat #3 Execute a series of random queries and see how long it..
Python: simple list merging based on intersections http://stackoverflow.com/questions/9110837/python-simple-list-merging-based-on-intersections results to_update.pop 1 for i in to_update last results i del results i last e_set return results # katrielalex's def pairs..
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