+
−
+
−===============
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− Python syntax
+
−===============
+
−.. contents::
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−   :local:
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−
+
−List comprehension
+
−==================
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−
+
−List comprehension produce complete list with compact syntax::
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−
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−  [x**2 for x in xrange(1,10)]
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−  [x+y for x in xrange(1,10) for y in xrange(1,10)]
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−  [x-y for x in xrange(1,10) for y in xrange(1,10) if x>y]
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−
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−  xlist = [x**2 for x in xrange(1,10)]
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−  print xlist[0], xlist[2], xlist[-1]
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−  print xlist[2:4]
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−  print sum(xlist), sum(xlist)
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−
+
−Generator expression
+
−====================
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−
+
−Generator expression produce generator with compact syntax::
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−
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−  (x**2 for x in xrange(1,10))
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−  (x+y for x in xrange(1,10) for y in xrange(1,10))
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−
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−  print [x for x in (x**2 for x in xrange(1,10))]
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−
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−  xgen = (x**2 for x in xrange(1,10))
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−  try:
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−      xgen[0]
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−  except TypeError:
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−      print "'generator' object has no attribute '__getitem__'"
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−  print sum(xlist), sum(xlist)
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−
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−Parentheses is required only if expression is ambiguous.
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−