Lib/dos-8x3/test_unp.py

   1 from test_support import *
   2
   3 t = (1, 2, 3)
   4 l = [4, 5, 6]
   5
   6 class Seq:
   7     def __getitem__(self, i):
   8         if i >= 0 and i < 3: return i
   9         raise IndexError
  10
  11 a = -1
  12 b = -1
  13 c = -1
  14
  15 # unpack tuple
  16 if verbose:
  17     print 'unpack tuple'
  18 a, b, c = t
  19 if a <> 1 or b <> 2 or c <> 3:
  20     raise TestFailed
  21
  22 # unpack list
  23 if verbose:
  24     print 'unpack list'
  25 a, b, c = l
  26 if a <> 4 or b <> 5 or c <> 6:
  27     raise TestFailed
  28
  29 # unpack implied tuple
  30 if verbose:
  31     print 'unpack implied tuple'
  32 a, b, c = 7, 8, 9
  33 if a <> 7 or b <> 8 or c <> 9:
  34     raise TestFailed
  35
  36 # unpack string... fun!
  37 if verbose:
  38     print 'unpack string'
  39 a, b, c = 'one'
  40 if a <> 'o' or b <> 'n' or c <> 'e':
  41     raise TestFailed
  42
  43 # unpack generic sequence
  44 if verbose:
  45     print 'unpack sequence'
  46 a, b, c = Seq()
  47 if a <> 0 or b <> 1 or c <> 2:
  48     raise TestFailed
  49
  50 # now for some failures
  51
  52 # unpacking non-sequence
  53 if verbose:
  54     print 'unpack non-sequence'
  55 try:
  56     a, b, c = 7
  57     raise TestFailed
  58 except TypeError:
  59     pass
  60
  61
  62 # unpacking tuple of wrong size
  63 if verbose:
  64     print 'unpack tuple wrong size'
  65 try:
  66     a, b = t
  67     raise TestFailed
  68 except ValueError:
  69     pass
  70
  71 # unpacking list of wrong size
  72 if verbose:
  73     print 'unpack list wrong size'
  74 try:
  75     a, b = l
  76     raise TestFailed
  77 except ValueError:
  78     pass
  79
  80
  81 # unpacking sequence too short
  82 if verbose:
  83     print 'unpack sequence too short'
  84 try:
  85     a, b, c, d = Seq()
  86     raise TestFailed
  87 except ValueError:
  88     pass
  89
  90
  91 # unpacking sequence too long
  92 if verbose:
  93     print 'unpack sequence too long'
  94 try:
  95     a, b = Seq()
  96     raise TestFailed
  97 except ValueError:
  98     pass
  99
 100
 101 # unpacking a sequence where the test for too long raises a different
 102 # kind of error
 103 class BozoError(Exception):
 104     pass
 105
 106 class BadSeq:
 107     def __getitem__(self, i):
 108         if i >= 0 and i < 3:
 109             return i
 110         elif i == 3:
 111             raise BozoError
 112         else:
 113             raise IndexError
 114
 115
 116 # trigger code while not expecting an IndexError
 117 if verbose:
 118     print 'unpack sequence too long, wrong error'
 119 try:
 120     a, b, c, d, e = BadSeq()
 121     raise TestFailed
 122 except BozoError:
 123     pass
 124
 125 # trigger code while expecting an IndexError
 126 if verbose:
 127     print 'unpack sequence too short, wrong error'
 128 try:
 129     a, b, c = BadSeq()
 130     raise TestFailed
 131 except BozoError:
 132     pass