circuitpython/tests/import/module_getattr.py
Paul m. p. P 454cca6016 py/objmodule: Implement PEP 562's __getattr__ for modules.
Configurable via MICROPY_MODULE_GETATTR, disabled by default.  Among other
things __getattr__ for modules can help to build lazy loading / code
unloading at runtime.
2018-10-23 11:22:50 +11:00

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Python

# test __getattr__ on module
# ensure that does_not_exist doesn't exist to start with
this = __import__(__name__)
try:
this.does_not_exist
assert False
except AttributeError:
pass
# define __getattr__
def __getattr__(attr):
if attr == 'does_not_exist':
return False
raise AttributeError
# do feature test (will also test functionality if the feature exists)
if not hasattr(this, 'does_not_exist'):
print('SKIP')
raise SystemExit
# check that __getattr__ works as expected
print(this.does_not_exist)