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annotate @pyobject/subsref.m @ 343:fe6b9e618c98

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Add %!xtests for known failures due to bugs in Octave * @py/py.m, @pyobject/pyobject.m, @pyobject/subsasgn.m, @pyobject/subsref.m: Add %!xtests for known failures due to bugs in Octave.
author Mike Miller <mtmiller@octave.org>
date Tue, 16 Aug 2016 13:54:25 -0700
parents 15c20ab4b80a
children 087e7bc3697f
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 ## Copyright (C) 2016 Colin B. Macdonald
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2 ##
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3 ## This file is part of Pytave
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4 ##
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5 ## Pytave is free software; you can redistribute it and/or modify
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6 ## it under the terms of the GNU General Public License as published
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7 ## by the Free Software Foundation; either version 3 of the License,
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8 ## or (at your option) any later version.
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9 ##
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10 ## This software is distributed in the hope that it will be useful,
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11 ## but WITHOUT ANY WARRANTY; without even the implied warranty
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12 ## of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
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13 ## the GNU General Public License for more details.
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14 ##
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15 ## You should have received a copy of the GNU General Public
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16 ## License along with this software; see the file COPYING.
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17 ## If not, see <http://www.gnu.org/licenses/>.
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18
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19 ## -*- texinfo -*-
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20 ## @documentencoding UTF-8
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21 ## @defop Method @@pyobject subsref (@var{x}, @var{idx})
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22 ## @defopx Operator @@pyobject {@var{x}.@var{property}} {}
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23 ## @defopx Operator @@pyobject {@var{x}.@var{method}(@var{a}, @dots{})} {}
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24 ## @defopx Operator @@pyobject {@var{x}@{@var{i}@}} {}
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25 ## @defopx Operator @@pyobject {@var{x}@{@var{i}, @var{j}, @dots{}@}} {}
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26 ## @defopx Operator @@pyobject {@var{x}(@var{a})} {}
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27 ## @defopx Operator @@pyobject {@var{x}(@var{a}, @var{b}, @dots{})} {}
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28 ## Call methods and access properties of a Python object.
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29 ##
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30 ##
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31 ## @seealso{@@pyobject/subsasgn}
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32 ## @end defop
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33
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34
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35 function varargout = subsref (x, idx)
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36
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37 t = idx(1);
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38 switch t.type
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39 case "()"
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40 r = pycall (x, t.subs{:});
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41
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42 case "."
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43 assert (ischar (t.subs))
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44 r = pycall ("getattr", x, t.subs);
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45
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46 case "{}"
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47 ## Determine the types and protocols that we are able to index into
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48 x_is_mapping = pycall (pyeval (
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49 "lambda x: isinstance(x, __import__('collections').Mapping)"), x);
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50 x_is_sequence = pycall (pyeval (
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51 ["lambda x: isinstance(x, (__import__('collections').Sequence, " ...
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52 "__import__('array').array, " ...
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53 "__import__('numpy').ndarray))"]), x);
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54
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55 if (! (x_is_mapping || x_is_sequence))
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56 error ("subsref: cannot index Python object, not sequence or mapping");
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57 endif
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58
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59 ## Subtract one from index: do this for lists, arrays, numpy arrays, etc
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60 for i = 1:length(t.subs)
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61 j = t.subs{i};
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62 if (isindex (j) && isnumeric (j) && x_is_sequence)
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63 t.subs{i} = cast (j, class (sizemax ())) - 1;
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64 endif
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65 endfor
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66
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67 if (ischar (t.subs{1}) && strcmp (t.subs{1}, ":"))
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68 if (x_is_mapping)
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69 ind = ":";
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70 else
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71 ind = int32 ([1:length(x)] - 1);
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72 endif
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73 elseif (isscalar (t.subs))
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74 ind = t.subs{1};
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75 else
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76 ind = pycall ("tuple", t.subs);
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77 endif
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78
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79 gi = pycall ("getattr", x, "__getitem__"); # x.__getitem__
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80 if (isempty (ind) && x_is_sequence)
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81 r = pyeval ("None");
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82 elseif (isnumeric (ind) && length (ind) > 1)
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83 r = {};
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84 for k = 1:length (ind)
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85 r(end+1) = pycall (gi, ind(k));
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86 endfor
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87 else
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88 r = pycall (gi, ind);
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89 endif
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90
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91 otherwise
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92 t
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93 error ("@pyobject/subsref: not implemented")
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94 endswitch
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95
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96 ## deal with additional indexing (might be recursive)
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97 if (length (idx) > 1)
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98 r = subsref (r, idx(2:end));
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99 endif
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100
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101 ## unpack results, ensure "ans" works (see also pycall)
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102 is_none = pyeval ("lambda x: x is None");
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103 if (nargout == 0 && ! pycall (is_none, r))
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104 varargout{1} = r;
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105 elseif (nargout == 1)
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106 varargout{1} = r;
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107 elseif (nargout >= 2)
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108 assert (length (r) == nargout, ...
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109 "pyobject/subsref: number of outputs must match")
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110 [varargout{1:nargout}] = subsref (r, struct ("type", "{}", "subs", {{1:nargout}}));
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111 endif
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112 endfunction
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113
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114
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115 %!test
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116 %! % list indexing
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117 %! L = pyeval ("[10., 20.]");
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118 %! assert (L{1}, 10)
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119 %! assert (L{2}, 20)
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120
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121 %!test
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122 %! % list indexing, slice
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123 %! L = pyeval ("[10., 20., [30., 40.]]");
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124 %! L2 = L{:};
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125 %! assert (L2{1}, 10)
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126 %! assert (L2{2}, 20)
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127 %! assert (L2{3}{1}, 30)
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128 %! assert (L2{3}{2}, 40)
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129
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130 %!test
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131 %! % list indexing, nested list
327
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132 %! L = pyeval ("[1., 2., [10., 11., 12.]]");
221
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133 %! assert (L{2}, 2)
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134 %! assert (L{3}{1}, 10)
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135 %! assert (L{3}{3}, 12)
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136
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137 %!test
299
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138 %! % list indexing, assign to vars
327
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139 %! L = pyeval ("[1., 2., 'Octave']");
299
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140 %! [a, b, c] = L{:};
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141 %! assert (a, 1)
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142 %! assert (b, 2)
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143 %! assert (c, "Octave")
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144
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145 %!test
221
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146 %! % 2D array indexing
327
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147 %! A = pyobject ([1. 2.; 3. 4.]);
221
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148 %! assert (A{1, 1}, 1)
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149 %! assert (A{2, 1}, 3)
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150 %! assert (A{1, 2}, 2)
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151
322
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152 ## Test element indexing on array.array types
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153 %!test
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154 %! a = pycall ("array.array", "d", {11, 12, 13, 14});
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155 %! assert (a{1}, 11)
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156 %! assert (a{2}, 12)
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157 %! assert (a{end}, 14)
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158
221
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159 %!test
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160 %! % dict: str key access
327
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161 %! d = pyeval ("{'one':1., 5:5, 6:6}");
221
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162 %! assert (d{"one"}, 1)
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163
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164 %!test
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165 %! % dict: integer key access
327
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166 %! d = pyeval ("{5:42., 6:42.}");
221
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167 %! assert (d{6}, 42)
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168
260
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169 %!test
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170 %! % dict: integer key should not subtract one
327
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171 %! d = pyeval ("{5:40., 6:42.}");
221
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172 %! assert (d{6}, 42)
240
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173
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174 %!test
260
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175 %! % dict: floating point keys should work
312
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176 %! d = pyeval ("{5.5:'ok'}");
260
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177 %! assert (d{5.5}, "ok")
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178
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179 %!test
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180 %! % dict: make sure key ":" doesn't break anything
327
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181 %! d = pyeval ("{'a':1., ':':2.}");
260
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182 %! assert (d{'a'}, 1)
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183 %! assert (d{':'}, 2)
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184
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185 %!test
240
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186 %! % method call with args
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187 %! s = pyeval ("set({1, 2})");
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188 %! s.add (42)
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189 %! assert (length (s) == 3)
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190
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191 %!test
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192 %! % get a callable
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193 %! s = pyeval ("set({1, 2})");
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194 %! sa = s.add;
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195 %! assert (isa (sa, "pyobject"))
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196 %! % and then call it
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197 %! sa (42)
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198 %! assert (length (s) == 3)
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199
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200 %!test
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201 %! % callable can return something
327
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202 %! s = pyeval ("set({1., 2.})");
240
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203 %! v = s.pop ();
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204 %! assert (length (s) == 1)
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205 %! assert (v == 1 || v == 2)
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206
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207 %!test
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208 %! % chain
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209 %! pyexec ("import sys")
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210 %! s = pyeval ("set({sys})");
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211 %! ver = s.pop ().version;
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212 %! assert (ischar (ver))
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213
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214 %!test
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215 %! % don't set "ans" if no return value
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216 %! s = pyeval ("set({1, 2})");
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217 %! sa = s.add;
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218 %! clear ans
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219 %! sa (42)
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220 %! assert (! exist ("ans", "var"))
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221
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222 %!test
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223 %! % *do* set "ans" if return value
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224 %! s = pyeval ("set({1, 2})");
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225 %! clear ans
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226 %! s.pop ();
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227 %! assert (exist ("ans", "var"))
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228 %! assert (length (s) == 1)
274
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229
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230 %!test
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231 %! % multiple return values: can get all of them
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232 %! f = pyeval ("lambda: (1, 2, 3)");
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233 %! a = f ();
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234 %! assert (length (a) == 3)
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235
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236 %!test
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237 %! % multiple return values: separate them
327
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238 %! f = pyeval ("lambda: (1., 2., 3.)");
274
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239 %! [a, b, c] = f ();
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240 %! assert (a, 1)
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241 %! assert (b, 2)
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242 %! assert (c, 3)
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243
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244 %!test
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245 %! % multiple return values: set ans
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246 %! f = pyeval ("lambda: (1, 2, 3)");
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247 %! f ();
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248 %! assert (length (ans) == 3)
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249
290
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250 %!test
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251 %! % ensure None is returned if nargout > 0
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252 %! L = pyeval ("[1, None, 3]");
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253 %! a = L{2};
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254 %! assert (char (a), "None")
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255
343
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256 ## Test of multi-element indexing, fails to return correct number of output args
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257 %!xtest
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258 %! a = {1, 2, 3, 4, 5, 6};
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259 %! b = pyobject (a);
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260 %! b{:};
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261 %! assert (ans, a{end})
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262
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263 %!xtest
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264 %! a = {1, 2, 3, 4, 5, 6};
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265 %! b = pyobject (a);
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266 %! c = {b{:}};
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267 %! assert (c, a)
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268
322
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269 %!error <cannot index Python object>
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270 %! f = pyeval ("abs");
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271 %! f{1}
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272
274
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273 %!error <outputs must match>
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274 %! % multiple return values: too many outputs
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275 %! f = pyeval ("lambda: (1, 2)");
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276 %! [a, b, c] = f ();
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277
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278 %!error <outputs must match>
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279 %! % multiple return values: not enough outputs
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280 %! f = pyeval ("lambda: (1, 2, 3)");
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281 %! [a, b] = f ();