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annotate pycall.cc @ 351:040aff46e4db

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Refactor calling a Python function into a set of wrapper functions * oct-py-eval.cc, oct-py-eval.h (pytave::py_call_function): New function overloads to call a Python function in various ways. * pycall.cc (Fpycall): Use pytave::py_call_function.
author Mike Miller <mtmiller@octave.org>
date Wed, 17 Aug 2016 14:02:33 -0700
parents 252b458bd904
children eac35d84ef0d
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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1 /*
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2
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3 Copyright (C) 2015-2016 Mike Miller
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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
132
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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 <boost/python.hpp>
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28 #include <boost/python/numeric.hpp>
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29
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30 #include <octave/oct.h>
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31 #include <octave/parse.h>
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32
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33 #define PYTAVE_DO_DECLARE_SYMBOL
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34 #include "arrayobjectdefs.h"
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35 #include "exceptions.h"
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36 #include "oct-py-eval.h"
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37 #include "oct-py-util.h"
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38 #include "octave_to_python.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 (pycall, args, nargout,
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44 "-*- texinfo -*-\n\
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45 @deftypefn {} {} pycall (@var{func})\n\
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46 @deftypefnx {} {@var{x} =} pycall (@var{func})\n\
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47 @deftypefnx {} {@var{x} =} pycall (@var{func}, @var{arg1}, @var{arg2}, @dots{})\n\
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48 Call a Python function or callable, passing Octave values as arguments.\n\
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49 \n\
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50 Examples:\n\
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51 @example\n\
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52 @group\n\
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53 pycall (\"float\", 6)\n\
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54 @result{} 6\n\
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55 pycall (\"os.getuid\")\n\
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56 @result{} ...\n\
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57 pycall (\"math.sqrt\", 2)\n\
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58 @result{} 1.4142\n\
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59 @end group\n\
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60 @end example\n\
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61 \n\
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62 If the callable has no return, and an lvalue is specified, it will be set\n\
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63 to @code{None}. However, if no lvalue was specified, @code{ans} will not\n\
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64 be set. For example:\n\
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65 @example\n\
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66 @group\n\
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67 s = pyeval (\"set([1, 2])\");\n\
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68 pycall (s.add, 3)\n\
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69 \n\
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70 r = pycall (s.add, 4)\n\
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71 @result{} r = [pyobject ...]\n\
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72 \n\
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73 None\n\
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74 \n\
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75 @end group\n\
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76 @end example\n\
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77 \n\
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78 @seealso{pyeval, pyexec}\n\
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79 @end deftypefn")
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80 {
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81 octave_value_list retval;
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82 std::string id;
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83
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84 int nargin = args.length ();
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85
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86 if (nargin < 1)
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87 {
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88 print_usage ();
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89 return retval;
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90 }
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91
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92 Py_Initialize ();
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93
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94 pytave::init_exceptions ();
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95 numeric::array::set_module_and_type ("numpy", "ndarray");
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96 _import_array ();
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98 try
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99 {
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100 object callable;
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101 pytave::get_object_from_python (args(0), callable);
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102 if (callable.is_none ())
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103 error("pycall: FUNC must be a string or a Python reference");
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104
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105 octave_value_list arglist = args.slice (1, nargin - 1);
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106 PyObject *result = pytave::py_call_function (callable.ptr (), arglist);
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107 object res = object (handle<PyObject> (result));
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108
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109 // Ensure reasonable "ans" behaviour, consistent with Python's "_".
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110 if (nargout > 0 || ! res.is_none ())
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111 {
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112 octave_value val;
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113 pytave::pyobj_to_octvalue (val, res);
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114 retval(0) = val;
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115 }
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116 }
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117 catch (pytave::object_convert_exception const &)
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118 {
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119 error ("pyexec: error in return value type conversion");
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120 }
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121 catch (pytave::value_convert_exception const &)
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122 {
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123 error ("pycall: error in argument type conversion");
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124 }
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125 catch (error_already_set const &)
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126 {
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127 std::string message = pytave::fetch_exception_message ();
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128 error ("pycall: %s", message.c_str ());
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129 }
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130
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131 return retval;
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132 }
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134 /*
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135 %!assert (ischar (pycall ("os.getcwd")))
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136 %!assert (isreal (pycall ("random.random")))
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137 %!assert (double (pycall ("math.exp", 3)), exp (3))
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138 %!assert (double (pycall ("math.trunc", pi)), fix (pi))
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139 %!assert (double (pycall ("math.sqrt", 2)), sqrt (2))
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140 %!assert (double (pycall ("cmath.sqrt", 2j)), sqrt (2j))
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141 %!assert (double (pycall ("int", 10.2)), 10)
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142 %!assert (isa (pycall ("object"), "pyobject"))
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143 %!assert (isa (pycall ("dict"), "pyobject"))
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144 %!assert (isa (pycall ("list"), "pyobject"))
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145 %!assert (isa (pycall ("tuple"), "pyobject"))
190
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146
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147 ## Test argument type conversion of values into Python
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148 %!test
230
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149 %! pyexec (["def typename(x):\n" ...
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150 %! " s = type(x).__name__\n" ...
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151 %! " if s == 'long':\n" ...
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152 %! " return 'int'\n" ...
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153 %! " return s"]);
197
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154 %!assert (pycall ("typename", 0), "float")
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155 %!assert (pycall ("typename", pi), "float")
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156 %!assert (pycall ("typename", 2j), "complex")
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157 %!assert (pycall ("typename", int32 (0)), "int")
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158 %!assert (pycall ("typename", false), "bool")
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159 %!assert (pycall ("typename", true), "bool")
190
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160 %!assert (pycall ("typename", "Hello world"), "str")
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161 %!assert (pycall ("typename", char ([1, 2, 3])), "str")
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162
303
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163 ## Test construction of sequence types from cell arrays
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164 %!assert (char (pycall ("list")), "[]")
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165 %!assert (char (pycall ("list", {})), "[]")
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166 %!assert (char (pycall ("list", {1, 2, 3})), "[1.0, 2.0, 3.0]")
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167 %!assert (char (pycall ("list", {int8(1), int8(2), int8(3)})), "[1, 2, 3]")
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168 %!assert (char (pycall ("tuple")), "()")
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169 %!assert (char (pycall ("tuple", {})), "()")
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170 %!assert (char (pycall ("tuple", {1, 2, 3})), "(1.0, 2.0, 3.0)")
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171 %!assert (char (pycall ("tuple", {int8(1), int8(2), int8(3)})), "(1, 2, 3)")
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172 %!error (pycall ("list", {1, 2, 3; 4, 5, 6}))
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173 %!error (pycall ("dict", {1, 2, 3}))
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174
334
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175 ## Test construction of dict from pyargs
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176 %!test
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177 %! a = pycall ("dict", pyargs ("a", 1, "b", 2, "c", 3));
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178 %! assert (sort (cell (pycall ("list", a.keys ()))), {"a", "b", "c"})
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179 %! assert (sort (double (pycall ("array.array", "d", a.values ()))), [1, 2, 3])
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180
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181 ## Test copy construction of dict from dict
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182 %!test
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183 %! a = pycall ("dict", pyargs ("a", 1, "b", 2, "c", 3));
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184 %! b = pycall ("dict", a);
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185 %! assert (isequal (a, b))
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186
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187 ## Test construction of dict from sequence of key value pairs
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188 %!test
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189 %! a = pycall ("dict", pyargs ("a", 1, "b", 2, "c", 3));
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190 %! b = pycall ("dict", pycall ("zip", {"a", "b", "c"}, {1, 2, 3}));
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191 %! assert (isequal (a, b))
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192
198
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193 ## Test round trip type preservation / conversion
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194 %!test
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195 %! pyexec ("def roundtrip(x): return x");
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parents: 197
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196 %! values = { 0, pi, 2j, eps, false, true, version, "Hello world", ...
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parents: 197
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197 %! [1, 2, 3], eye (4) };
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parents: 197
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198 %! for i = 1:numel (values)
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199 %! assert (pycall ("roundtrip", values{i}), values{i});
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200 %! endfor
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diff changeset
201
304
a133564f4af7 Convert integer types to appropriate Python int or long types (fixes issue #55)
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202 ## Test conversion of integer types into Python
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203 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 0"), int8 (0)))
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204 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == -2**7 "), intmin ("int8")))
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205 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 2**7 -1"), intmax ("int8")))
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206 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 0"), intmin ("uint8")))
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207 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 2**8 -1"), intmax ("uint8")))
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208 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 0"), int16 (0)))
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209 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == -2**15 "), intmin ("int16")))
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210 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 2**15-1"), intmax ("int16")))
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211 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 0"), intmin ("uint16")))
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212 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 2**16-1"), intmax ("uint16")))
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213 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 0"), int32 (0)))
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214 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == -2**31 "), intmin ("int32")))
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215 %!assert (pycall (pyeval ("lambda x: type(x) == type(0) and x == 2**31-1"), intmax ("int32")))
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216 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == 0"), intmin ("uint32")))
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217 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == 2**32-1"), intmax ("uint32")))
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diff changeset
218 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == 0"), int64 (0)))
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diff changeset
219 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == -2**63 "), intmin ("int64")))
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220 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == 2**63-1"), intmax ("int64")))
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221 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == 0"), intmin ("uint64")))
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222 %!assert (pycall (pyeval ("lambda x: type(x) == type(2**64) and x == 2**64-1"), intmax ("uint64")))
a133564f4af7 Convert integer types to appropriate Python int or long types (fixes issue #55)
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diff changeset
223
195
459b6f5c56ed maint: prefer term "argument" over "parameter" for values passed into a function
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parents: 194
diff changeset
224 %!error <argument type conversion>
263
0fc1a58d7e89 Delete unnecessary newlines in one-line function definitions
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225 %! pyexec ("def intwrapper(x): return int(x)");
193
28173dc00d51 Add catch for value_convert_exception and a test. (fixes issue #16)
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parents: 190
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226 %! pycall ("intwrapper", ftp ());
28173dc00d51 Add catch for value_convert_exception and a test. (fixes issue #16)
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parents: 190
diff changeset
227
328
5782d7932529 Automatically convert Python 2 'int' type to Octave int64 (fixes issue #56)
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228 ## Test conversion of integer types from Python
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diff changeset
229 %!test
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230 %! if (pyeval ("__import__('sys').hexversion >= 0x03000000"))
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diff changeset
231 %! assert (isa (pycall ("int", 0), "pyobject"))
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diff changeset
232 %! assert (isa (pycall ("int", 2^31-1), "pyobject"))
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233 %! assert (isa (pycall ("int", -2^31), "pyobject"))
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234 %! assert (double (pycall ("int", 0)), 0)
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diff changeset
235 %! assert (double (pycall ("int", 2^31-1)), 2^31-1)
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236 %! assert (double (pycall ("int", -2^31)), -2^31)
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diff changeset
237 %! else
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diff changeset
238 %! assert (pycall ("int", 0), int64 (0))
5782d7932529 Automatically convert Python 2 'int' type to Octave int64 (fixes issue #56)
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parents: 327
diff changeset
239 %! assert (pycall ("int", 2^31-1), int64 (2^31-1))
5782d7932529 Automatically convert Python 2 'int' type to Octave int64 (fixes issue #56)
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diff changeset
240 %! assert (pycall ("int", -2^31), int64 (-2^31))
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241 %! assert (isa (pycall ("long", 0), "pyobject"))
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242 %! assert (isa (pycall ("long", 2^31-1), "pyobject"))
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243 %! assert (isa (pycall ("long", -2^31), "pyobject"))
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diff changeset
244 %! assert (double (pycall ("long", 0)), 0)
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245 %! assert (double (pycall ("long", 2^31-1)), 2^31-1)
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246 %! assert (double (pycall ("long", -2^31)), -2^31)
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diff changeset
247 %! endif
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248 %!assert (isa (pycall ("int", 2^100), "pyobject"))
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diff changeset
249
180
5f0d94afebe2 Added some basic tests
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parents: 178
diff changeset
250 %!test
263
0fc1a58d7e89 Delete unnecessary newlines in one-line function definitions
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parents: 248
diff changeset
251 %! pyexec ("def pyfunc(x): return 2*x");
182
0bf4b7cf16ee maint: Use Octave coding style conventions for unit tests
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parents: 180
diff changeset
252 %! z = pycall ("pyfunc", [20 20]);
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253 %! assert (z, [40 40])
183
2b03585d4ddd Add proper conversion of booleans between octave and python. (fixes issue #6)
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parents: 182
diff changeset
254
2b03585d4ddd Add proper conversion of booleans between octave and python. (fixes issue #6)
Abhinav Tripathi <genuinelucifer@gmail.com>
parents: 182
diff changeset
255 %!test
184
8b97647e48f1 maint: whitespace fixes for cset 2b03585d4ddd
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parents: 183
diff changeset
256 %! pyexec (["def pyfunc(x):\n" ...
197
d6c44d680482 Convert Octave scalars into Python scalars (fixes issue #14)
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diff changeset
257 %! " if x is True:\n return 30\n" ...
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258 %! " elif x is False:\n return 20\n" ...
184
8b97647e48f1 maint: whitespace fixes for cset 2b03585d4ddd
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parents: 183
diff changeset
259 %! " else:\n return 10"]);
327
15c20ab4b80a Do not automatically convert Python integer types to Octave (see issue #56)
Mike Miller <mtmiller@octave.org>
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260 %! assert (double (pycall ("pyfunc", true)), 30)
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261 %! assert (double (pycall ("pyfunc", false)), 20)
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262 %! assert (double (pycall ("pyfunc", 10)), 10)
231
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263
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264 %!error <NameError>
263
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265 %! pyexec ("def raiseException(): raise NameError('oops')")
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266 %! pycall ("raiseException")
239
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267
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268 ## None as a return value
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269 %!test
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270 %! f = pyeval ("lambda: None");
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271 %! r = pycall (f);
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272 %! is_none = pyeval ("lambda x: x is None");
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273 %! assert (is_none (r))
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274
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275 ## But returning None will not set "ans"
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276 %!test
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277 %! f = pyeval ("lambda: None");
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278 %! clear ans
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279 %! pycall (f);
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280 %! assert (! exist ("ans", "var"))
180
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281 */