Lib/test/test_dictcomps.py

   1
   2 doctests = """
   3
   4     >>> k = "old value"
   5     >>> { k: None for k in range(10) }
   6     {0: None, 1: None, 2: None, 3: None, 4: None, 5: None, 6: None, 7: None, 8: None, 9: None}
   7     >>> k
   8     'old value'
   9
  10     >>> { k: k+10 for k in range(10) }
  11     {0: 10, 1: 11, 2: 12, 3: 13, 4: 14, 5: 15, 6: 16, 7: 17, 8: 18, 9: 19}
  12
  13     >>> g = "Global variable"
  14     >>> { k: g for k in range(10) }
  15     {0: 'Global variable', 1: 'Global variable', 2: 'Global variable', 3: 'Global variable', 4: 'Global variable', 5: 'Global variable', 6: 'Global variable', 7: 'Global variable', 8: 'Global variable', 9: 'Global variable'}
  16
  17     >>> { k: v for k in range(10) for v in range(10) if k == v }
  18     {0: 0, 1: 1, 2: 2, 3: 3, 4: 4, 5: 5, 6: 6, 7: 7, 8: 8, 9: 9}
  19
  20     >>> { k: v for v in range(10) for k in range(v*9, v*10) }
  21     {9: 1, 18: 2, 19: 2, 27: 3, 28: 3, 29: 3, 36: 4, 37: 4, 38: 4, 39: 4, 45: 5, 46: 5, 47: 5, 48: 5, 49: 5, 54: 6, 55: 6, 56: 6, 57: 6, 58: 6, 59: 6, 63: 7, 64: 7, 65: 7, 66: 7, 67: 7, 68: 7, 69: 7, 72: 8, 73: 8, 74: 8, 75: 8, 76: 8, 77: 8, 78: 8, 79: 8, 81: 9, 82: 9, 83: 9, 84: 9, 85: 9, 86: 9, 87: 9, 88: 9, 89: 9}
  22
  23     >>> { x: y for y, x in ((1, 2), (3, 4)) } = 5 # doctest: +IGNORE_EXCEPTION_DETAIL
  24     Traceback (most recent call last):
  25        ...
  26     SyntaxError: ...
  27
  28     >>> { x: y for y, x in ((1, 2), (3, 4)) } += 5 # doctest: +IGNORE_EXCEPTION_DETAIL
  29     Traceback (most recent call last):
  30        ...
  31     SyntaxError: ...
  32
  33 """
  34
  35 __test__ = {'doctests' : doctests}
  36
  37 def test_main(verbose=None):
  38     import sys
  39     from test import test_support
  40     from test import test_dictcomps
  41     test_support.run_doctest(test_dictcomps, verbose)
  42
  43     # verify reference counting
  44     if verbose and hasattr(sys, "gettotalrefcount"):
  45         import gc
  46         counts = [None] * 5
  47         for i in range(len(counts)):
  48             test_support.run_doctest(test_dictcomps, verbose)
  49             gc.collect()
  50             counts[i] = sys.gettotalrefcount()
  51         print(counts)
  52
  53 if __name__ == "__main__":
  54     test_main(verbose=True)