author | martin.trojer@nokia.com |
Fri, 31 Jul 2009 15:01:17 +0100 | |
changeset 1 | 2fb8b9db1c86 |
permissions | -rw-r--r-- |
1
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:mod:`symtable` --- Access to the compiler's symbol tables |
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========================================================== |
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.. module:: symtable |
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:synopsis: Interface to the compiler's internal symbol tables. |
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.. moduleauthor:: Jeremy Hylton <jeremy@alum.mit.edu> |
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.. sectionauthor:: Benjamin Peterson |
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Symbol tables are generated by the compiler from AST just before bytecode is |
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generated. The symbol table is responsible for calculating the scope of every |
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identifier in the code. :mod:`symtable` provides an interface to examine these |
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tables. |
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Generating Symbol Tables |
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------------------------ |
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.. function:: symtable(code, filename, compile_type) |
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Return the toplevel :class:`SymbolTable` for the Python source *code*. |
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*filename* is the name of the file containing the code. *compile_type* is |
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like the *mode* argument to :func:`compile`. |
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Examining Symbol Tables |
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----------------------- |
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.. class:: SymbolTable |
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A namespace table for a block. The constructor is not public. |
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.. method:: get_type() |
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Return the type of the symbol table. Possible values are ``'class'``, |
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``'module'``, and ``'function'``. |
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.. method:: get_id() |
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Return the table's identifier. |
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.. method:: get_name() |
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Return the table's name. This is the name of the class if the table is |
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for a class, the name of the function if the table is for a function, or |
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``'top'`` if the table is global (:meth:`get_type` returns ``'module'``). |
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.. method:: get_lineno() |
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Return the number of the first line in the block this table represents. |
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.. method:: is_optimized() |
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Return ``True`` if the locals in this table can be optimized. |
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.. method:: is_nested() |
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Return ``True`` if the block is a nested class or function. |
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.. method:: has_children() |
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Return ``True`` if the block has nested namespaces within it. These can |
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be obtained with :meth:`get_children`. |
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.. method:: has_exec() |
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Return ``True`` if the block uses ``exec``. |
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.. method:: has_import_start() |
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Return ``True`` if the block uses a starred from-import. |
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.. method:: get_identifiers() |
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Return a list of names of symbols in this table. |
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.. method:: lookup(name) |
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Lookup *name* in the table and return a :class:`Symbol` instance. |
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.. method:: get_symbols() |
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Return a list of :class:`Symbol` instances for names in the table. |
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.. method:: get_children() |
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Return a list of the nested symbol tables. |
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.. class:: Function |
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A namespace for a function or method. This class inherits |
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:class:`SymbolTable`. |
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.. method:: get_parameters() |
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Return a tuple containing names of parameters to this function. |
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.. method:: get_locals() |
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Return a tuple containing names of locals in this function. |
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.. method:: get_globals() |
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Return a tuple containing names of globals in this function. |
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.. method:: get_frees() |
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Return a tuple containing names of free variables in this function. |
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changeset
|
112 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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113 |
.. class:: Class |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
114 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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115 |
A namespace of a class. This class inherits :class:`SymbolTable`. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
116 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
117 |
.. method:: get_methods() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
118 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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119 |
Return a tuple containing the names of methods declared in the class. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
120 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
121 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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122 |
.. class:: Symbol |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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123 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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124 |
An entry in a :class:`SymbolTable` corresponding to an identifier in the |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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125 |
source. The constructor is not public. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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126 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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127 |
.. method:: get_name() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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128 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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129 |
Return the symbol's name. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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130 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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131 |
.. method:: is_referenced() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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132 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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133 |
Return ``True`` if the symbol is used in its block. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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134 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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135 |
.. method:: is_imported() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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136 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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137 |
Return ``True`` if the symbol is created from an import statement. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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138 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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139 |
.. method:: is_parameter() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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140 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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141 |
Return ``True`` if the symbol is a parameter. |
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142 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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143 |
.. method:: is_global() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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144 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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145 |
Return ``True`` if the symbol is global. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
146 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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147 |
.. method:: is_local() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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148 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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149 |
Return ``True`` if the symbol is local to its block. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
150 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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151 |
.. method:: is_free() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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152 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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153 |
Return ``True`` if the symbol is referenced in its block, but not assigned |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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154 |
to. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
155 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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156 |
.. method:: is_assigned() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
157 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
158 |
Return ``True`` if the symbol is assigned to in its block. |
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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 |
.. method:: is_namespace() |
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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 |
Return ``True`` if name binding introduces new namespace. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
163 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
164 |
If the name is used as the target of a function or class statement, this |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
165 |
will be true. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
166 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
167 |
Note that a single name can be bound to multiple objects. If the result |
2fb8b9db1c86
Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
168 |
is ``True``, the name may also be bound to other objects, like an int or |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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diff
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|
169 |
list, that does not introduce a new namespace. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
170 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
171 |
.. method:: get_namespaces() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
172 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
173 |
Return a list of namespaces bound to this name. |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
diff
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|
174 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
175 |
.. method:: get_namespace() |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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parents:
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|
176 |
|
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
177 |
Return the namespace bound to this name. If more than one namespace is |
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Initial QEMU (symbian-qemu-0.9.1-12) import
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|
178 |
bound, a :exc:`ValueError` is raised. |