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⚡️ Speed up function __getattr__ by 8% #47

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⚡️ Speed up function __getattr__ by 8% #47

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14 changes: 9 additions & 5 deletions quantecon/kalman.py
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Original file line number Diff line number Diff line change
Expand Up @@ -14,15 +14,19 @@ def __dir__():


def __getattr__(name):
if name not in __all__:
# Fast-path: compare directly to avoid linear search if only a single item
if name != 'Kalman':
raise AttributeError(
"`quantecon.kalman` is deprecated and has no attribute "
f"'{name}'."
)

warnings.warn(f"Please use `{name}` from the `quantecon` namespace, the"
"`quantecon.kalman` namespace is deprecated. You can use"
f" the following instead:\n `from quantecon import {name}`.",
category=DeprecationWarning, stacklevel=2)
# Pre-build warning message for efficiency
warnings.warn(
"Please use `Kalman` from the `quantecon` namespace, the"
"`quantecon.kalman` namespace is deprecated. You can use"
" the following instead:\n `from quantecon import Kalman`.",
category=DeprecationWarning, stacklevel=2
)

return getattr(_kalman, name)