import inspect
allowed_vars = set(["min_", "max_", "path", ...])
def update_globals(dic):
caller_frame = inspect.currentframe(1)
globals = caller_frame.f_globals
# here, you _could_ simply do globals.update(dic)
# but it is evil
for key, value in dic.items():
#here you should carefully verify each key, and value for not
#not dangerous pairs, with stuff like:
#if key not in allowed_vars:
# sys.stderr.write("Warning: invalid variable in configuration update
")
# continue
#if type(value) not in (string, int, float):
# #(issue error)
# continue
globals[key] = value
Example:
>>> a
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined
>>> update_globals({"a": 5})
>>> a
5
update 2016-06 A couple of weeks ago I had put together the extradict
Python package - it is available on pypi now. One of its features is the MapGetter
context manager that allows exactly what is being asked for
by doing something along:
from extradict import MapGetter
def myfunc():
options = {'DATABASES': {'default': {'ENGINE': 'django.db.backends.sqlite3'}}}
with MapGetter(options) as options:
from options import DATABASES
...
And other normal "from .... import .... " usages, but from a dictionary or mapping object (including a default dict).
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