Hi Robert B and all,
Does anyone know a trick to access the global variables for the "main"
scope?
In the attached patch (for 4.2; untested on 4.3), I am implementing
the following in sage.misc.misc_c:
def inject_variable(name, value):
"""
sage: from sage.misc.misc_c import inject_variable
sage: inject_variable("a", 314)
sage: a
314
"""
G = globals()
G[name] = value
When called from the interpreter, this works just fine. However, the
purpose is to call this function from library code, and then it breaks.
More precisely, if I call this from a Python function, say
`sage.misc.misc.inject_variable_test` as in the patch, then the
globals() call returns instead the global variables for the module
`sage.misc.misc`.
Tips most welcome!
Cheers,
Nicolas
--
Nicolas M. Thiéry "Isil" <nthi...@users.sf.net>
http://Nicolas.Thiery.name/
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#....: Implements centralized sage.misc.misc_c.inject_variable
diff --git a/sage/misc/misc.py b/sage/misc/misc.py
--- a/sage/misc/misc.py
+++ b/sage/misc/misc.py
@@ -2215,3 +2215,41 @@ def is_in_string(line, pos):
i += 1
return in_quote()
+
+
+
+def inject_variable_test(i):
+ """
+ sage: sage.misc.misc_c.inject_variable("ble", 2)
+ sage: ble
+ 2
+
+ sage: def inject_variable_test(i):
+ ... sage.misc.misc_c.inject_variable("bli", i)
+ sage: inject_variable_test(314)
+ sage: bli
+ 314
+ sage: inject_variable_test(271)
+ doctest:...: RuntimeWarning: Redefining global value bli
+ sage: bli
+ 271
+ sage: sage.misc.misc.inject_variable_test2 = inject_variable_test
+ sage: sage.misc.misc.inject_variable_test2(123)
+ doctest:...: RuntimeWarning: Redefining global value bli
+ sage: bli
+ 123
+
+ sage: sage.misc.misc.inject_variable_test(314)
+ sage: bla
+ 314
+ sage: sage.misc.misc.inject_variable_test(271)
+ doctest:...: RuntimeWarning: Redefining global value bla
+ sage: bla
+ 271
+ """
+ import __main__
+ print __main__.myglobals()
+ from sage.misc.misc_c import inject_variable
+ inject_variable("bla",i)
+ import sage
+ sage.calculus.var.var("truc")
diff --git a/sage/misc/misc_c.pyx b/sage/misc/misc_c.pyx
--- a/sage/misc/misc_c.pyx
+++ b/sage/misc/misc_c.pyx
@@ -13,6 +13,7 @@
# http://www.gnu.org/licenses/
#*****************************************************************************
import sys
+from warnings import warn
include "../ext/stdsage.pxi"
include "../ext/python_sequence.pxi"
@@ -957,3 +958,19 @@ cpdef list normalize_index(object key, i
else:
raise TypeError, "index must be an integer or slice"
return return_list
+
+cpdef inject_variable(name, value):
+ """
+ sage: from sage.misc.misc_c import inject_variable
+ sage: inject_variable("a", 314)
+ sage: a
+ 314
+ sage: inject_variable("a", 271)
+ doctest:...: RuntimeWarning: Redefining global value a
+ sage: a
+ 271
+ """
+ G = globals()
+ if name in G:
+ warn("Redefining global value %s"%name, RuntimeWarning, stacklevel = 1)
+ G[name] = value
