How do I call setattr() on the current module?
import systhismodule = sys.modules[__name__]setattr(thismodule, name, value)
or, without using setattr
(which breaks the letter of the question but satisfies the same practical purposes;-):
globals()[name] = value
Note: at module scope, the latter is equivalent to:
vars()[name] = value
which is a bit more concise, but doesn't work from within a function (vars()
gives the variables of the scope it's called at: the module's variables when called at global scope, and then it's OK to use it R/W, but the function's variables when called in a function, and then it must be treated as R/O -- the Python online docs can be a bit confusing about this specific distinction).
In Python 3.7, you will be able to use __getattr__
at the module level (related answer).
Per PEP 562:
def __getattr__(name): if name == "SOME_CONSTANT": return 42 raise AttributeError(f"module {__name__} has no attribute {name}")
If you must set module scoped variables from within the module, what's wrong with global
?
# my_module.pydef define_module_scoped_variables(): global a, b, c a, b, c = 'a', ['b'], 3
thus:
>>> import my_module>>> my_module.define_module_scoped_variables()>>> aNameError: name 'a' is not defined>>> my_module.a'a'>>> my_module.b['b']