As PEP 562 has been implemented in Python >= 3.7, now we can do this
file: module.py
def __getattr__(name):
if name == 'y':
return 3
raise AttributeError(f"module '{__name__}' has no attribute '{name}'")
other = 4
usage:
>>> import module
>>> module.y
3
>>> module.other
4
>>> module.nosuch
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "module.py", line 4, in __getattr__
raise AttributeError(f"module '{__name__}' has no attribute '{name}'")
AttributeError: module 'module' has no attribute 'nosuch'
Note that if you omit the raise AttributeError
in the __getattr__
function, it means the function ends with return None
, then the module.nosuch
will get a value of None
.