I want to give a user the possibility of "restarting" an interactive
session, by removing all the objects defined by her since the
beginning. The way I make this possible is by having a "function"
that can be called during the interactive session using locals() as an
argument, as follows:
restart(locals())
It works. However, I would like to make this "friendlier", i.e.
requiring the user to simply type
restart()
and have the code extract out the value of locals() of the "parent"
namespace. I thought it might be possible using sys._getframe, but I
have not been able to figure out why.
Any help would be appreciated.
André
==================
The code below defines the class I used. The interpreter is started
via
#--
exec user_code in symbols
#--
where user_code is
#--
interp = SingleConsole()
interp.interact()
#--
# InteractiveConsole is very similar to the class of the same name
# in module code.py of the standard library
class SingleConsole(InteractiveConsole):
'''SingleConsole are isolated one from another'''
def __init__(self, locals={}, filename="Isolated console"):
self.locals = locals
self.locals['restart'] = self.restart
InteractiveConsole.__init__(self, self.locals,
filename=filename)
def restart(self, loc):
"""Call this function as follows: restart(locals())
Used to restart an interpreter session, removing all
variables
and functions introduced by the user, but leaving Crunchy
specific
ones in."""
to_delete = set()
# We can't iterate over a dict while changing its size; we do
it
# in two steps; first identify the objects to be deleted while
# iterating over the dict; then iterate over a set while
removing
# the objects in the dict.
for x in loc:
if x not in ['__builtins__', 'crunchy', 'restart']:
to_delete.add(x)
for x in to_delete:
del loc[x]
return
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