Mercurial > pytave
annotate @pyobject/subsref.m @ 367:9d7188514f2c
Use pyobject.isa instead of lambda to check Python types
* @py/subsref.m, @pyobject/methods.m, @pyobject/pyobject.m,
@pyobject/subsasgn.m, @pyobject/subsref.m: Use pyobject.isa to check Python
types more efficiently.
author | Mike Miller <mtmiller@octave.org> |
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date | Thu, 25 Aug 2016 15:26:32 -0700 |
parents | 087e7bc3697f |
children | 4d54fb68de71 |
rev | line source |
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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}} {} |
238 | 23 ## @defopx Operator @@pyobject {@var{x}.@var{method}(@var{a}, @dots{})} {} |
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24 ## @defopx Operator @@pyobject {@var{x}@{@var{i}@}} {} |
238 | 25 ## @defopx Operator @@pyobject {@var{x}@{@var{i}, @var{j}, @dots{}@}} {} |
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26 ## @defopx Operator @@pyobject {@var{x}(@var{a})} {} |
238 | 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 = isa (x, "py.collections.Mapping"); |
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49 x_is_sequence = any (isa (x, {"py.collections.Sequence", ... |
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50 "py.array.array", "py.numpy.ndarray"})); |
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51 |
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52 if (! (x_is_mapping || x_is_sequence)) |
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53 error ("subsref: cannot index Python object, not sequence or mapping"); |
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54 endif |
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55 |
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56 ## Subtract one from index: do this for lists, arrays, numpy arrays, etc |
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57 for i = 1:length(t.subs) |
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58 j = t.subs{i}; |
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59 if (isindex (j) && isnumeric (j) && x_is_sequence) |
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60 t.subs{i} = cast (j, class (sizemax ())) - 1; |
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61 endif |
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62 endfor |
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63 |
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64 if (ischar (t.subs{1}) && strcmp (t.subs{1}, ":")) |
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65 if (x_is_mapping) |
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66 ind = ":"; |
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67 else |
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68 ind = int32 ([1:length(x)] - 1); |
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69 endif |
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70 elseif (isscalar (t.subs)) |
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71 ind = t.subs{1}; |
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72 else |
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73 ind = pycall ("tuple", t.subs); |
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74 endif |
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75 |
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76 gi = pycall ("getattr", x, "__getitem__"); # x.__getitem__ |
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77 if (isempty (ind) && x_is_sequence) |
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78 r = pyeval ("None"); |
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79 elseif (isnumeric (ind) && length (ind) > 1) |
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80 r = {}; |
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81 for k = 1:length (ind) |
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82 r(end+1) = pycall (gi, ind(k)); |
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83 endfor |
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84 else |
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85 r = pycall (gi, ind); |
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86 endif |
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87 |
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88 otherwise |
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89 t |
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90 error ("@pyobject/subsref: not implemented") |
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91 endswitch |
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92 |
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93 ## deal with additional indexing (might be recursive) |
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94 if (length (idx) > 1) |
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95 r = subsref (r, idx(2:end)); |
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96 endif |
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97 |
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98 ## unpack results, ensure "ans" works (see also pycall) |
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99 is_none = pyeval ("lambda x: x is None"); |
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100 if (nargout == 0 && ! pycall (is_none, r)) |
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101 varargout{1} = r; |
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102 elseif (nargout == 1) |
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103 varargout{1} = r; |
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104 elseif (nargout >= 2) |
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105 assert (length (r) == nargout, ... |
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106 "pyobject/subsref: number of outputs must match") |
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107 [varargout{1:nargout}] = subsref (r, struct ("type", "{}", "subs", {{1:nargout}})); |
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108 endif |
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109 endfunction |
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110 |
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111 |
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112 %!test |
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113 %! % list indexing |
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114 %! L = pyeval ("[10., 20.]"); |
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115 %! assert (L{1}, 10) |
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116 %! assert (L{2}, 20) |
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117 |
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118 %!test |
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119 %! % list indexing, slice |
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120 %! L = pyeval ("[10., 20., [30., 40.]]"); |
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121 %! L2 = L{:}; |
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122 %! assert (L2{1}, 10) |
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123 %! assert (L2{2}, 20) |
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124 %! assert (L2{3}{1}, 30) |
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125 %! assert (L2{3}{2}, 40) |
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126 |
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127 %!test |
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128 %! % list indexing, nested list |
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129 %! L = pyeval ("[1., 2., [10., 11., 12.]]"); |
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130 %! assert (L{2}, 2) |
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131 %! assert (L{3}{1}, 10) |
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132 %! assert (L{3}{3}, 12) |
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133 |
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134 %!test |
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135 %! % list indexing, assign to vars |
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136 %! L = pyeval ("[1., 2., 'Octave']"); |
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137 %! [a, b, c] = L{:}; |
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138 %! assert (a, 1) |
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139 %! assert (b, 2) |
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140 %! assert (char (c), "Octave") |
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141 |
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142 %!test |
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143 %! % 2D array indexing |
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144 %! A = pyobject ([1. 2.; 3. 4.]); |
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145 %! assert (A{1, 1}, 1) |
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146 %! assert (A{2, 1}, 3) |
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147 %! assert (A{1, 2}, 2) |
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148 |
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149 ## Test element indexing on array.array types |
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150 %!test |
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151 %! a = pycall ("array.array", "d", {11, 12, 13, 14}); |
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152 %! assert (a{1}, 11) |
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153 %! assert (a{2}, 12) |
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154 %! assert (a{end}, 14) |
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155 |
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156 %!test |
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157 %! % dict: str key access |
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158 %! d = pyeval ("{'one':1., 5:5, 6:6}"); |
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159 %! assert (d{"one"}, 1) |
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160 |
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161 %!test |
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162 %! % dict: integer key access |
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163 %! d = pyeval ("{5:42., 6:42.}"); |
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164 %! assert (d{6}, 42) |
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165 |
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166 %!test |
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167 %! % dict: integer key should not subtract one |
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168 %! d = pyeval ("{5:40., 6:42.}"); |
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169 %! assert (d{6}, 42) |
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170 |
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171 %!test |
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172 %! % dict: floating point keys should work |
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173 %! d = pyeval ("{5.5:'ok'}"); |
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174 %! assert (char (d{5.5}), "ok") |
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175 |
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176 %!test |
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177 %! % dict: make sure key ":" doesn't break anything |
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178 %! d = pyeval ("{'a':1., ':':2.}"); |
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179 %! assert (d{'a'}, 1) |
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180 %! assert (d{':'}, 2) |
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181 |
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182 %!test |
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183 %! % method call with args |
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184 %! s = pyeval ("set({1, 2})"); |
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185 %! s.add (42) |
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186 %! assert (length (s) == 3) |
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187 |
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188 %!test |
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189 %! % get a callable |
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190 %! s = pyeval ("set({1, 2})"); |
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191 %! sa = s.add; |
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192 %! assert (isa (sa, "pyobject")) |
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193 %! % and then call it |
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194 %! sa (42) |
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195 %! assert (length (s) == 3) |
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196 |
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197 %!test |
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198 %! % callable can return something |
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199 %! s = pyeval ("set({1., 2.})"); |
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200 %! v = s.pop (); |
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201 %! assert (length (s) == 1) |
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202 %! assert (v == 1 || v == 2) |
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203 |
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204 %!test |
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205 %! % chain |
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206 %! pyexec ("import sys") |
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207 %! s = pyeval ("set({sys})"); |
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208 %! ver = s.pop ().version; |
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209 %! assert (isa (ver, "pyobject")) |
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210 %! assert (ischar (char (ver))) |
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211 |
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212 %!test |
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213 %! % don't set "ans" if no return value |
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214 %! s = pyeval ("set({1, 2})"); |
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215 %! sa = s.add; |
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216 %! clear ans |
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217 %! sa (42) |
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218 %! assert (! exist ("ans", "var")) |
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219 |
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220 %!test |
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221 %! % *do* set "ans" if return value |
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222 %! s = pyeval ("set({1, 2})"); |
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223 %! clear ans |
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224 %! s.pop (); |
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225 %! assert (exist ("ans", "var")) |
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226 %! assert (length (s) == 1) |
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227 |
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228 %!test |
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229 %! % multiple return values: can get all of them |
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230 %! f = pyeval ("lambda: (1, 2, 3)"); |
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231 %! a = f (); |
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232 %! assert (length (a) == 3) |
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233 |
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234 %!test |
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235 %! % multiple return values: separate them |
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236 %! f = pyeval ("lambda: (1., 2., 3.)"); |
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237 %! [a, b, c] = f (); |
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238 %! assert (a, 1) |
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239 %! assert (b, 2) |
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240 %! assert (c, 3) |
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241 |
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242 %!test |
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243 %! % multiple return values: set ans |
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244 %! f = pyeval ("lambda: (1, 2, 3)"); |
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245 %! f (); |
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246 %! assert (length (ans) == 3) |
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248 %!test |
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249 %! % ensure None is returned if nargout > 0 |
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250 %! L = pyeval ("[1, None, 3]"); |
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251 %! a = L{2}; |
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252 %! assert (char (a), "None") |
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253 |
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254 ## Test of multi-element indexing, fails to return correct number of output args |
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255 %!xtest |
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256 %! a = {1, 2, 3, 4, 5, 6}; |
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257 %! b = pyobject (a); |
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258 %! b{:}; |
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259 %! assert (ans, a{end}) |
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260 |
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261 %!xtest |
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262 %! a = {1, 2, 3, 4, 5, 6}; |
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263 %! b = pyobject (a); |
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264 %! c = {b{:}}; |
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265 %! assert (c, a) |
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266 |
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267 %!error <cannot index Python object> |
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268 %! f = pyeval ("abs"); |
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269 %! f{1} |
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270 |
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271 %!error <outputs must match> |
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272 %! % multiple return values: too many outputs |
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273 %! f = pyeval ("lambda: (1, 2)"); |
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274 %! [a, b, c] = f (); |
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275 |
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276 %!error <outputs must match> |
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277 %! % multiple return values: not enough outputs |
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278 %! f = pyeval ("lambda: (1, 2, 3)"); |
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279 %! [a, b] = f (); |