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Set of modifications/improvements for Ostap

Vanya Belyaev requested to merge vanya-ostap-2 into master

  • improve 'accumulate' method for histograms:

    >>> sum = h.accumulate ()
 >>> sum = h.accumulate ( cut = lambda s :  0.4<=s[1].value()<0.5 )
 >>> sum = h.accumulate ( low  = 1    , high = 14 ) ## accumulate over    1<= ibin <14
 >>> sum = h.accumulate ( xmin = 0.14 , xmax = 14 ) ## accumulate over xmin<= x    <xmax
 - add xmin/xmax parameters for histogram parameterezation:

b = histo.bezier( 10 , xmin = 0.14 )


 - Add Profiler/profiler utilities for Utils.py:
from Ostap.Utils import profiler
with profiler() :
      ...  some code here ...
with profiler( 'output.file' ) :
      ...  some code here ...

 - add "--profile" flag to ostap-script:

  ostap  .... --profile

 - ZipShelve:  add method 'ikeys' for iteration over 'good' matched keys:

  db = ...
  for k in db.ikeys('*MC*') :
       print k, db[k]

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