Utility functions for libGAP¶
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class
sage.libs.gap.util.
ObjWrapper
¶ Bases:
object
Wrapper for GAP master pointers
EXAMPLES:
sage: from sage.libs.gap.util import ObjWrapper sage: x = ObjWrapper() sage: y = ObjWrapper() sage: x == y True
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sage.libs.gap.util.
command
(command_string)¶ Playground for accessing Gap via libGap.
You should not use this function in your own programs. This is just here for convenience if you want to play with the libgap libray code.
EXAMPLES:
sage: from sage.libs.gap.util import command sage: command('1') Output follows... 1 sage: command('1/0') Traceback (most recent call last): ... ValueError: libGAP: Error, Rational operations: <divisor> must not be zero sage: command('NormalSubgroups') Output follows... <Attribute "NormalSubgroups"> sage: command('rec(a:=1, b:=2)') Output follows... rec( a := 1, b := 2 )
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sage.libs.gap.util.
error_enter_libgap_block_twice
()¶ Demonstrate that we catch errors from entering a block twice.
EXAMPLES:
sage: from sage.libs.gap.util import error_enter_libgap_block_twice sage: error_enter_libgap_block_twice() Traceback (most recent call last): ... RuntimeError: Entered a critical block twice
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sage.libs.gap.util.
error_exit_libgap_block_without_enter
()¶ Demonstrate that we catch errors from omitting libgap_enter.
EXAMPLES:
sage: from sage.libs.gap.util import error_exit_libgap_block_without_enter sage: error_exit_libgap_block_without_enter() Traceback (most recent call last): ... RuntimeError: Called libgap_exit without previous libgap_enter
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sage.libs.gap.util.
gap_root
()¶ Find the location of the GAP root install which is stored in the gap startup script.
EXAMPLES:
sage: from sage.libs.gap.util import gap_root sage: gap_root() # random output '/home/vbraun/opt/sage-5.3.rc0/local/gap/latest'
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sage.libs.gap.util.
get_owned_objects
()¶ Helper to access the refcount dictionary from Python code