* Added zip_gen() to simulate the effect of built-in zip() function, but

implemented as a generator rather than yielding the list right away.
  This is used mainly in loops, where we don't want to generate all the
  elements due to memory concerns.
master
Wirawan Purwanto 13 years ago
parent 606214eb66
commit 501552a65a
  1. 12
      sugar.py

@ -93,6 +93,18 @@ def list_join(*L):
return r
def zip_gen(*L):
"""Generator version of the built-in zip() function.
Used so that the all the loop iterations are not invoked before
the main `for' statement is invoked (e.g. if memory is a concern
when generating the list--this method does not generate any list).
Performance could be slightly slower than the original zip function,
though."""
L_iters = [ i.__iter__() for i in L ]
while True:
yield tuple([ L1.next() for L1 in L_iters ])
class ranges_type:
"""This class is to provide dirty magic to specify piecewice slices
of one-dimensional ranges.

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