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Mini Shell
import pytest
import warnings
import numpy as np
@pytest.mark.filterwarnings("error")
def test_getattr_warning():
# issue gh-14735: make sure we clear only getattr errors, and let warnings
# through
class Wrapper:
def __init__(self, array):
self.array = array
def __len__(self):
return len(self.array)
def __getitem__(self, item):
return type(self)(self.array[item])
def __getattr__(self, name):
if name.startswith("__array_"):
warnings.warn("object got converted", UserWarning, stacklevel=1)
return getattr(self.array, name)
def __repr__(self):
return "<Wrapper({self.array})>".format(self=self)
array = Wrapper(np.arange(10))
with pytest.raises(UserWarning, match="object got converted"):
np.asarray(array)
def test_array_called():
class Wrapper:
val = '0' * 100
def __array__(self, result=None):
return np.array([self.val], dtype=object)
wrapped = Wrapper()
arr = np.array(wrapped, dtype=str)
assert arr.dtype == 'U100'
assert arr[0] == Wrapper.val
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