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def __getattr__(attr_name):
import warnings
from numpy.fft import _helper
ret = getattr(_helper, attr_name, None)
if ret is None:
raise AttributeError(
f"module 'numpy.fft.helper' has no attribute {attr_name}")
warnings.warn(
"The numpy.fft.helper has been made private and renamed to "
"numpy.fft._helper. All four functions exported by it (i.e. fftshift, "
"ifftshift, fftfreq, rfftfreq) are available from numpy.fft. "
f"Please use numpy.fft.{attr_name} instead.",
DeprecationWarning,
stacklevel=3
)
return ret
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