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annotate pyeval.cc @ 403:3644df6564bc

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maint: use C++11 nullptr rather than 0 or NULL * __py_struct_from_dict__.cc, oct-py-eval.cc, oct-py-eval.h, oct-py-object.h, oct-py-types.cc, oct-py-util.cc, pycall.cc, pyeval.cc, pyexec.cc: Use C++11 nullptr rather than 0 or NULL.
author Mike Miller <mtmiller@octave.org>
date Fri, 28 Apr 2017 14:19:49 -0700
parents 087e7bc3697f
children 478d83448b0b
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1 /*
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2
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3 Copyright (C) 2016 Colin B. Macdonald
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4
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5 This file is part of Pytave.
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6
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7 Pytave is free software; you can redistribute it and/or modify it
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8 under the terms of the GNU General Public License as published by the
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9 Free Software Foundation; either version 3 of the License, or (at your
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10 option) any later version.
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11
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12 Pytave is distributed in the hope that it will be useful, but WITHOUT
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13 ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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14 FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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15 for more details.
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16
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17 You should have received a copy of the GNU General Public License
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18 along with Pytave; see the file COPYING. If not, see
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19 <http://www.gnu.org/licenses/>.
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20
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21 */
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22
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23 #if defined (HAVE_CONFIG_H)
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24 # include <config.h>
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25 #endif
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26
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27 #include <dlfcn.h>
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28 #include <boost/python.hpp>
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29 #include <boost/python/numeric.hpp>
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30
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31 #include <oct.h>
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32 #include <octave/parse.h>
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33
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34 #define PYTAVE_DO_DECLARE_SYMBOL
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35 #include "arrayobjectdefs.h"
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36 #include "exceptions.h"
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37 #include "oct-py-eval.h"
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38 #include "oct-py-util.h"
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39 #include "python_to_octave.h"
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40
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41 using namespace boost::python;
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42
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43 DEFUN_DLD (pyeval, args, nargout,
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44 "-*- texinfo -*-\n\
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45 @deftypefn {} {} pyeval (@var{expr})\n\
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46 @deftypefnx {} {} pyeval (@var{expr}, @var{localns})\n\
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47 @deftypefnx {} {@var{x} =} pyeval (@dots{})\n\
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48 Evaluate a Python expression and return the result.\n\
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49 \n\
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50 When called with an optional second argument, @var{localns} is a\n\
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51 @code{py.dict} that acts as the namespace for any assignments or other\n\
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52 side effects of the expression.\n\
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53 \n\
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54 Examples:\n\
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55 @example\n\
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56 @group\n\
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57 pyexec (\"import sys\")\n\
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58 pyeval (\"sys.version\")\n\
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59 @result{} ...\n\
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60 pyeval (\"dict(two=2)\")\n\
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61 @result{} [pyobject ...]\n\
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62 @{'two': 2@}\n\
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63 @end group\n\
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64 @end example\n\
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65 @seealso{pycall, pyexec}\n\
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66 @end deftypefn")
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67 {
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68 octave_value_list retval;
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69
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70 int nargin = args.length ();
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71
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72 if (nargin < 1 || nargin > 2)
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73 {
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74 print_usage ();
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75 return retval;
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76 }
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77
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78 std::string code = args(0).string_value ();
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79
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80 Py_Initialize ();
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81
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82 PyObject *local_namespace = nullptr;
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83 if (nargin > 1)
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84 {
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85 local_namespace = pytave::pyobject_unwrap_object (args(1));
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86 if (! local_namespace)
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87 error ("pyeval: NAMESPACE must be a valid Python reference");
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88 }
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89
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90 try
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91 {
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92 PyObject *obj = pytave::py_eval_string (code, 0, local_namespace);
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93 boost::python::object res { boost::python::handle<> (obj) };
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94
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95 if (nargout > 0 || ! res.is_none ())
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96 {
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97 octave_value val;
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98 pytave::pyobj_to_octvalue (val, res);
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99 retval(0) = val;
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100 }
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101 }
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102 catch (pytave::object_convert_exception const &)
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103 {
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104 error ("pyexec: error in return value type conversion");
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105 }
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106 catch (error_already_set const &)
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107 {
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108 std::string message = pytave::fetch_exception_message ();
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109 error ("pyeval: %s", message.c_str ());
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110 }
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111
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112 return retval;
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113 }
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114
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115 /*
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116 %!assert (isnumeric (double (pyeval ("0"))))
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117 %!assert (isreal (double (pyeval ("0"))))
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118 %!assert (double (pyeval ("0")), 0)
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119
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120 %!assert (isnumeric (pyeval ("10.1")))
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121 %!assert (isreal (pyeval ("10.1")))
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122 %!assert (pyeval ("10.1"), 10.1)
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123
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124 %!assert (isnumeric (pyeval ("2j")))
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125 %!assert (iscomplex (pyeval ("2j")))
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126 %!assert (pyeval ("2j"), 2j)
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127
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128 %!assert (ischar (char (pyeval ("\"I <3 Octave\""))))
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129 %!assert (char (pyeval ("\"I <3 Octave\"")), "I <3 Octave")
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131 %!assert (islogical (pyeval ("True")))
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132 %!assert (islogical (pyeval ("False")))
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133 %!assert (pyeval ("True"), true)
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134 %!assert (pyeval ("False"), false)
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135 %!assert (class (pyeval ("True")), "logical")
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136 %!assert (class (pyeval ("False")), "logical")
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137
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138 %!assert (isa (pyeval ("object()"), "pyobject"))
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139
327
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140 %!assert (isnumeric (double (pyeval ("__import__('sys').maxsize"))))
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141 %!assert (double (pyeval ("99999999999999")), 99999999999999)
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142 %!assert (double (pyeval ("-99999999999999")), -99999999999999)
271
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143
278
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144 %!test
327
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145 %! z = pyeval ("{'x': 1., 'y': 2.}");
278
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146 %! assert (isa (z, "pyobject"))
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147 %! assert (z{"x"}, 1)
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148
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149 %!test
327
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150 %! z = pyeval ("[1., 2., 3.]");
278
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151 %! assert (isa (z, "pyobject"))
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152 %! assert ({z{1}, z{2}, z{3}}, {1, 2, 3})
190
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153
180
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154 %!test
327
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155 %! z = pyeval ("(4., 5., 6.)");
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156 %! assert (isa (z, "pyobject"))
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157 %! assert ({z{1}, z{2}, z{3}}, {4, 5, 6})
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158
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159 %!test
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160 %! z = pyeval ("[1., [21., 22.], 3., [41., [421., 422.], 43.]]");
278
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161 %! assert (isa (z, "pyobject"))
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162 %! assert (isa (z{2}, "pyobject"))
182
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163 %! assert (z{2}{1}, 21)
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164 %! assert (z{2}{2}, 22)
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165 %! assert (isa (z{4}{2}, "pyobject"))
182
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166 %! assert (z{4}{2}{1}, 421)
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167 %! assert (z{4}{2}{2}, 422)
231
6fffa6219b2c Properly extract exception text from Python (fixes issue #24)
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168
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169 %!error <NameError>
263
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170 %! pyexec ("def raiseException(): raise NameError ('oops')")
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171 %! pyeval ("raiseException()")
307
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172
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173 %!test
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174 %! % Variable defined in global namespace is available locally
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175 %! myNS = pyeval ("{}");
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176 %! pyexec ("myvar = 1.")
307
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177 %! assert (pyeval ("myvar", myNS), 1);
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178
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179 %!test
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180 %! % Variables with same name can have different values in different namespaces
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181 %! myNS1 = pyeval ("{}");
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182 %! myNS2 = pyeval ("{}");
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183 %! pyexec ("myvar = 1.")
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184 %! pyexec ("myvar = 2.", myNS1)
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185 %! pyexec ("myvar = 3.", myNS2)
307
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186 %! assert (pyeval ("myvar"), 1)
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187 %! assert (pyeval ("myvar", myNS1), 2)
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188 %! assert (pyeval ("myvar", myNS2), 3)
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189
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190 %!error <NameError>
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191 %! pyexec ("if 'myvar' in globals(): del myvar")
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192 %! % Variable defined in local namespace MUST not be available globally
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193 %! myNS = pyeval ("{}");
327
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194 %! pyexec ("myvar = 1.", myNS)
307
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195 %! pyeval ("myvar");
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196
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197 %!error <NameError>
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198 %! pyexec ("if 'myvar' in globals(): del myvar")
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199 %! % Variable defined in one local namespace MUST not be available in another
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200 %! myNS1 = pyeval ("{}");
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201 %! myNS2 = pyeval ("{}");
327
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202 %! pyexec ("myvar = 1.", myNS1)
307
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203 %! pyeval ("myvar", myNS2);
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204
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205 %!error <NameError>
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206 %! pyexec ("if 'sys' in globals(): del sys")
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207 %! % Modules imported in local namespace MUST not be accessible globally
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208 %! myNS = pyeval ("{}");
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209 %! pyexec ("import sys", myNS);
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210 %! pyeval ("sys");
180
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211 */