author | bugtracker-ml@nttdocomo.com |
Tue, 06 Apr 2010 17:00:22 +0100 | |
changeset 56 | f24810eebc6b |
parent 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
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.. highlightlang:: c |
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.. _veryhigh: |
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************************* |
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The Very High Level Layer |
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************************* |
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The functions in this chapter will let you execute Python source code given in a |
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file or a buffer, but they will not let you interact in a more detailed way with |
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the interpreter. |
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Several of these functions accept a start symbol from the grammar as a |
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parameter. The available start symbols are :const:`Py_eval_input`, |
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:const:`Py_file_input`, and :const:`Py_single_input`. These are described |
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following the functions which accept them as parameters. |
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Note also that several of these functions take :ctype:`FILE\*` parameters. On |
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particular issue which needs to be handled carefully is that the :ctype:`FILE` |
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structure for different C libraries can be different and incompatible. Under |
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Windows (at least), it is possible for dynamically linked extensions to actually |
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use different libraries, so care should be taken that :ctype:`FILE\*` parameters |
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are only passed to these functions if it is certain that they were created by |
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the same library that the Python runtime is using. |
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.. cfunction:: int Py_Main(int argc, char **argv) |
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The main program for the standard interpreter. This is made available for |
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programs which embed Python. The *argc* and *argv* parameters should be |
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prepared exactly as those which are passed to a C program's :cfunc:`main` |
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function. It is important to note that the argument list may be modified (but |
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the contents of the strings pointed to by the argument list are not). The return |
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value will be the integer passed to the :func:`sys.exit` function, ``1`` if the |
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interpreter exits due to an exception, or ``2`` if the parameter list does not |
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represent a valid Python command line. |
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.. cfunction:: int PyRun_AnyFile(FILE *fp, const char *filename) |
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This is a simplified interface to :cfunc:`PyRun_AnyFileExFlags` below, leaving |
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*closeit* set to ``0`` and *flags* set to *NULL*. |
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.. cfunction:: int PyRun_AnyFileFlags(FILE *fp, const char *filename, PyCompilerFlags *flags) |
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This is a simplified interface to :cfunc:`PyRun_AnyFileExFlags` below, leaving |
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the *closeit* argument set to ``0``. |
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.. cfunction:: int PyRun_AnyFileEx(FILE *fp, const char *filename, int closeit) |
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This is a simplified interface to :cfunc:`PyRun_AnyFileExFlags` below, leaving |
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the *flags* argument set to *NULL*. |
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.. cfunction:: int PyRun_AnyFileExFlags(FILE *fp, const char *filename, int closeit, PyCompilerFlags *flags) |
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If *fp* refers to a file associated with an interactive device (console or |
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terminal input or Unix pseudo-terminal), return the value of |
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:cfunc:`PyRun_InteractiveLoop`, otherwise return the result of |
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:cfunc:`PyRun_SimpleFile`. If *filename* is *NULL*, this function uses |
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``"???"`` as the filename. |
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.. cfunction:: int PyRun_SimpleString(const char *command) |
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This is a simplified interface to :cfunc:`PyRun_SimpleStringFlags` below, |
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leaving the *PyCompilerFlags\** argument set to NULL. |
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.. cfunction:: int PyRun_SimpleStringFlags(const char *command, PyCompilerFlags *flags) |
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Executes the Python source code from *command* in the :mod:`__main__` module |
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according to the *flags* argument. If :mod:`__main__` does not already exist, it |
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is created. Returns ``0`` on success or ``-1`` if an exception was raised. If |
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there was an error, there is no way to get the exception information. For the |
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meaning of *flags*, see below. |
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.. cfunction:: int PyRun_SimpleFile(FILE *fp, const char *filename) |
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This is a simplified interface to :cfunc:`PyRun_SimpleFileExFlags` below, |
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leaving *closeit* set to ``0`` and *flags* set to *NULL*. |
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.. cfunction:: int PyRun_SimpleFileFlags(FILE *fp, const char *filename, PyCompilerFlags *flags) |
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This is a simplified interface to :cfunc:`PyRun_SimpleFileExFlags` below, |
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leaving *closeit* set to ``0``. |
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.. cfunction:: int PyRun_SimpleFileEx(FILE *fp, const char *filename, int closeit) |
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This is a simplified interface to :cfunc:`PyRun_SimpleFileExFlags` below, |
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leaving *flags* set to *NULL*. |
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.. cfunction:: int PyRun_SimpleFileExFlags(FILE *fp, const char *filename, int closeit, PyCompilerFlags *flags) |
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Similar to :cfunc:`PyRun_SimpleStringFlags`, but the Python source code is read |
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from *fp* instead of an in-memory string. *filename* should be the name of the |
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file. If *closeit* is true, the file is closed before PyRun_SimpleFileExFlags |
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105 |
returns. |
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|
106 |
|
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|
107 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
108 |
.. cfunction:: int PyRun_InteractiveOne(FILE *fp, const char *filename) |
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|
109 |
|
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|
110 |
This is a simplified interface to :cfunc:`PyRun_InteractiveOneFlags` below, |
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|
111 |
leaving *flags* set to *NULL*. |
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|
112 |
|
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|
113 |
|
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|
114 |
.. cfunction:: int PyRun_InteractiveOneFlags(FILE *fp, const char *filename, PyCompilerFlags *flags) |
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|
115 |
|
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|
116 |
Read and execute a single statement from a file associated with an interactive |
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|
117 |
device according to the *flags* argument. If *filename* is *NULL*, ``"???"`` is |
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|
118 |
used instead. The user will be prompted using ``sys.ps1`` and ``sys.ps2``. |
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|
119 |
Returns ``0`` when the input was executed successfully, ``-1`` if there was an |
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|
120 |
exception, or an error code from the :file:`errcode.h` include file distributed |
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|
121 |
as part of Python if there was a parse error. (Note that :file:`errcode.h` is |
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122 |
not included by :file:`Python.h`, so must be included specifically if needed.) |
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|
123 |
|
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|
124 |
|
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125 |
.. cfunction:: int PyRun_InteractiveLoop(FILE *fp, const char *filename) |
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126 |
|
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127 |
This is a simplified interface to :cfunc:`PyRun_InteractiveLoopFlags` below, |
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|
128 |
leaving *flags* set to *NULL*. |
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|
129 |
|
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|
130 |
|
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131 |
.. cfunction:: int PyRun_InteractiveLoopFlags(FILE *fp, const char *filename, PyCompilerFlags *flags) |
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|
132 |
|
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|
133 |
Read and execute statements from a file associated with an interactive device |
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|
134 |
until EOF is reached. If *filename* is *NULL*, ``"???"`` is used instead. The |
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|
135 |
user will be prompted using ``sys.ps1`` and ``sys.ps2``. Returns ``0`` at EOF. |
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|
136 |
|
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|
137 |
|
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|
138 |
.. cfunction:: struct _node* PyParser_SimpleParseString(const char *str, int start) |
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|
139 |
|
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|
140 |
This is a simplified interface to |
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|
141 |
:cfunc:`PyParser_SimpleParseStringFlagsFilename` below, leaving *filename* set |
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|
142 |
to *NULL* and *flags* set to ``0``. |
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|
143 |
|
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|
144 |
|
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|
145 |
.. cfunction:: struct _node* PyParser_SimpleParseStringFlags( const char *str, int start, int flags) |
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|
146 |
|
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|
147 |
This is a simplified interface to |
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|
148 |
:cfunc:`PyParser_SimpleParseStringFlagsFilename` below, leaving *filename* set |
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|
149 |
to *NULL*. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
150 |
|
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|
151 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
152 |
.. cfunction:: struct _node* PyParser_SimpleParseStringFlagsFilename( const char *str, const char *filename, int start, int flags) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
153 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
154 |
Parse Python source code from *str* using the start token *start* according to |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
155 |
the *flags* argument. The result can be used to create a code object which can |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
156 |
be evaluated efficiently. This is useful if a code fragment must be evaluated |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
157 |
many times. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
158 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
159 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
160 |
.. cfunction:: struct _node* PyParser_SimpleParseFile(FILE *fp, const char *filename, int start) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
161 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
162 |
This is a simplified interface to :cfunc:`PyParser_SimpleParseFileFlags` below, |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
163 |
leaving *flags* set to ``0`` |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
164 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
165 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
166 |
.. cfunction:: struct _node* PyParser_SimpleParseFileFlags(FILE *fp, const char *filename, int start, int flags) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
167 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
168 |
Similar to :cfunc:`PyParser_SimpleParseStringFlagsFilename`, but the Python |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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|
169 |
source code is read from *fp* instead of an in-memory string. |
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|
170 |
|
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|
171 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
172 |
.. cfunction:: PyObject* PyRun_String(const char *str, int start, PyObject *globals, PyObject *locals) |
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|
173 |
|
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|
174 |
This is a simplified interface to :cfunc:`PyRun_StringFlags` below, leaving |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
175 |
*flags* set to *NULL*. |
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|
176 |
|
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|
177 |
|
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|
178 |
.. cfunction:: PyObject* PyRun_StringFlags(const char *str, int start, PyObject *globals, PyObject *locals, PyCompilerFlags *flags) |
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|
179 |
|
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|
180 |
Execute Python source code from *str* in the context specified by the |
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|
181 |
dictionaries *globals* and *locals* with the compiler flags specified by |
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|
182 |
*flags*. The parameter *start* specifies the start token that should be used to |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
183 |
parse the source code. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
184 |
|
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|
185 |
Returns the result of executing the code as a Python object, or *NULL* if an |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
186 |
exception was raised. |
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|
187 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
188 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
189 |
.. cfunction:: PyObject* PyRun_File(FILE *fp, const char *filename, int start, PyObject *globals, PyObject *locals) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
190 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
191 |
This is a simplified interface to :cfunc:`PyRun_FileExFlags` below, leaving |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
192 |
*closeit* set to ``0`` and *flags* set to *NULL*. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
193 |
|
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|
194 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
195 |
.. cfunction:: PyObject* PyRun_FileEx(FILE *fp, const char *filename, int start, PyObject *globals, PyObject *locals, int closeit) |
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|
196 |
|
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|
197 |
This is a simplified interface to :cfunc:`PyRun_FileExFlags` below, leaving |
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|
198 |
*flags* set to *NULL*. |
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|
199 |
|
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|
200 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
201 |
.. cfunction:: PyObject* PyRun_FileFlags(FILE *fp, const char *filename, int start, PyObject *globals, PyObject *locals, PyCompilerFlags *flags) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
202 |
|
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|
203 |
This is a simplified interface to :cfunc:`PyRun_FileExFlags` below, leaving |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
204 |
*closeit* set to ``0``. |
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|
205 |
|
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|
206 |
|
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|
207 |
.. cfunction:: PyObject* PyRun_FileExFlags(FILE *fp, const char *filename, int start, PyObject *globals, PyObject *locals, int closeit, PyCompilerFlags *flags) |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
208 |
|
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|
209 |
Similar to :cfunc:`PyRun_StringFlags`, but the Python source code is read from |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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*fp* instead of an in-memory string. *filename* should be the name of the file. |
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If *closeit* is true, the file is closed before :cfunc:`PyRun_FileExFlags` |
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returns. |
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.. cfunction:: PyObject* Py_CompileString(const char *str, const char *filename, int start) |
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This is a simplified interface to :cfunc:`Py_CompileStringFlags` below, leaving |
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*flags* set to *NULL*. |
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.. cfunction:: PyObject* Py_CompileStringFlags(const char *str, const char *filename, int start, PyCompilerFlags *flags) |
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Parse and compile the Python source code in *str*, returning the resulting code |
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object. The start token is given by *start*; this can be used to constrain the |
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code which can be compiled and should be :const:`Py_eval_input`, |
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:const:`Py_file_input`, or :const:`Py_single_input`. The filename specified by |
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*filename* is used to construct the code object and may appear in tracebacks or |
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:exc:`SyntaxError` exception messages. This returns *NULL* if the code cannot |
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be parsed or compiled. |
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.. cfunction:: PyObject* PyEval_EvalCode(PyCodeObject *co, PyObject *globals, PyObject *locals) |
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This is a simplified interface to :cfunc:`PyEval_EvalCodeEx`, with just |
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the code object, and the dictionaries of global and local variables. |
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The other arguments are set to *NULL*. |
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.. cfunction:: PyObject* PyEval_EvalCodeEx(PyCodeObject *co, PyObject *globals, PyObject *locals, PyObject **args, int argcount, PyObject **kws, int kwcount, PyObject **defs, int defcount, PyObject *closure) |
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Evaluate a precompiled code object, given a particular environment for its |
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evaluation. This environment consists of dictionaries of global and local |
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variables, arrays of arguments, keywords and defaults, and a closure tuple of |
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cells. |
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.. cfunction:: PyObject* PyEval_EvalFrame(PyFrameObject *f) |
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Evaluate an execution frame. This is a simplified interface to |
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PyEval_EvalFrameEx, for backward compatibility. |
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.. cfunction:: PyObject* PyEval_EvalFrameEx(PyFrameObject *f, int throwflag) |
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This is the main, unvarnished function of Python interpretation. It is |
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literally 2000 lines long. The code object associated with the execution |
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frame *f* is executed, interpreting bytecode and executing calls as needed. |
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The additional *throwflag* parameter can mostly be ignored - if true, then |
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it causes an exception to immediately be thrown; this is used for the |
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:meth:`throw` methods of generator objects. |
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|
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|
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.. cfunction:: int PyEval_MergeCompilerFlags(PyCompilerFlags *cf) |
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|
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This function changes the flags of the current evaluation frame, and returns |
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true on success, false on failure. |
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|
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|
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.. cvar:: int Py_eval_input |
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|
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.. index:: single: Py_CompileString() |
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|
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The start symbol from the Python grammar for isolated expressions; for use with |
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:cfunc:`Py_CompileString`. |
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|
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|
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.. cvar:: int Py_file_input |
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|
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.. index:: single: Py_CompileString() |
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|
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The start symbol from the Python grammar for sequences of statements as read |
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from a file or other source; for use with :cfunc:`Py_CompileString`. This is |
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the symbol to use when compiling arbitrarily long Python source code. |
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|
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|
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.. cvar:: int Py_single_input |
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287 |
|
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.. index:: single: Py_CompileString() |
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|
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The start symbol from the Python grammar for a single statement; for use with |
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:cfunc:`Py_CompileString`. This is the symbol used for the interactive |
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interpreter loop. |
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|
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.. ctype:: struct PyCompilerFlags |
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|
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This is the structure used to hold compiler flags. In cases where code is only |
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being compiled, it is passed as ``int flags``, and in cases where code is being |
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executed, it is passed as ``PyCompilerFlags *flags``. In this case, ``from |
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__future__ import`` can modify *flags*. |
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|
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Whenever ``PyCompilerFlags *flags`` is *NULL*, :attr:`cf_flags` is treated as |
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equal to ``0``, and any modification due to ``from __future__ import`` is |
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discarded. :: |
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|
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struct PyCompilerFlags { |
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int cf_flags; |
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} |
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|
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|
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.. cvar:: int CO_FUTURE_DIVISION |
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This bit can be set in *flags* to cause division operator ``/`` to be |
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interpreted as "true division" according to :pep:`238`. |
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