Created
December 22, 2011 18:40
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Some example code showing unexpected behavior of __array_wrap__ in a subclass of np.matrix
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import numpy as np | |
class ArrSubClass(np.ndarray): | |
def __new__(cls, input_var): | |
obj = np.ndarray(input_var).view(cls) | |
return obj | |
def __array_wrap__(self, obj): | |
raise AssertionError | |
class MatSubClass(np.matrix): | |
def __new__(cls, input_var): | |
obj = np.matrix(input_var).view(cls) | |
return obj | |
def __array_wrap__(self, obj): | |
raise AssertionError | |
def run_test(obj_creation_strs = ['o=ArrSubClass(2)', | |
'o=MatSubClass([1, 1])', | |
'o=MatSubClass([1.0, 1.0])',], | |
obj_use_strs = ['o2 = o + 2', 'o2 = o + 2.0', | |
'o2 = o * 2', 'o2 = o * 2.0', | |
'o2 = o * o.T', | |
'o2 = np.dot(o,2)', | |
'o2 = np.dot(o,2.0)', | |
'o2 = np.dot(o,o.T)', | |
'o2 = np.core.multiarray.dot(o,2)', | |
'o2 = np.core.multiarray.dot(o,2.0)', | |
'o2 = np.core.multiarray.dot(o,o.T)'] ): | |
str_fmt = '{0:10s} | {1:30s} | {2:20s}' | |
print str_fmt.format('aw called?', 'creation', 'use') | |
for create_str in obj_creation_strs: | |
for use_str in obj_use_strs: | |
exec(create_str) | |
try: | |
exec(use_str) | |
except AssertionError: | |
print str_fmt.format('Yes', create_str, use_str) | |
else: | |
print str_fmt.format('No', create_str, use_str) | |
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