8000 ENH: adds support for array construction from iterators · numpy/numpy@b50d9a1 · GitHub
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behzadnouribehzadnouri
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ENH: adds support for array construction from iterators
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3 files changed

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‎numpy/core/src/multiarray/ctors.c

Lines changed: 28 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -1639,6 +1639,34 @@ PyArray_GetArrayParamsFromObject(PyObject *op,
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/* Anything can be viewed as an object, unless it needs to be writeable */
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if (!writeable) {
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/*
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* PyIter_Check returns false positive, for python 2 old-style
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* instances;
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*/
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#if defined(NPY_PY3K)
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if (PyIter_Check(op)) {
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#else
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if (PyIter_Check(op) && !PyInstance_Check(op)) {
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#endif
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/* PyArray_FromIter needs type & does not like 'object' type */
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if (requested_dtype != NULL &&
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!PyDataType_REFCHK(requested_dtype)) {
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Py_INCREF(requested_dtype);
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*out_arr = (PyArrayObject *)
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PyArray_FromIter(op, requested_dtype, -1);
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}
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else {
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PyObject *list = PySequence_List(op);
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if (list == NULL) {
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return -1;
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}
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Py_XINCREF(requested_dtype);
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*out_arr = (PyArrayObject *) PyArray_FromAny(list,
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requested_dtype, 0, 0, NPY_ARRAY_DEFAULT, context);
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Py_DECREF(list);
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}
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return (*out_arr) == NULL ? -1 : 0;
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}
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*out_dtype = PyArray_DescrFromType(NPY_OBJECT);
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if (*out_dtype == NULL) {
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return -1;

‎numpy/core/tests/test_multiarray.py

Lines changed: 12 additions & 0 deletions
Original file line numberDiff line numberDiff line change
@@ -12,6 +12,7 @@
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import builtins
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else:
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import __builtin__ as builtins
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range = xrange
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from decimal import Decimal
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@@ -303,6 +304,17 @@ def test_array_cont(self):
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assert_(np.ascontiguousarray(d).flags.c_contiguous)
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assert_(np.asfortranarray(d).flags.f_contiguous)
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def test_array_iter(self):
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assert_array_equal(np.array(x for x in range(3)), [0, 1, 2])
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arr = np.array(map(np.sqrt, [0, 1, 4]), dtype='float')
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assert_array_equal(arr, [0, 1, 2])
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arr = np.array((x for x in [0, 'abc', 2.7]), dtype='object')
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assert_array_equal(arr, np.array([0, 'abc', 2.7], dtype='object'))
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arr = np.array(x for x in [range(2), range(2, 4)])
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assert_array_equal(arr, [[0, 1], [2, 3]])
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class TestAssignment(TestCase):
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def test_assignment_broadcasting(self):

‎numpy/lib/tests/test_stride_tricks.py

Lines changed: 2 additions & 1 deletion
Original file line numberDiff line numberDiff line change
@@ -271,7 +271,8 @@ def test_broadcast_shape():
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assert_equal(_broadcast_shape(np.ones((1, 1))), (1, 1))
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assert_equal(_broadcast_shape(np.ones((1, 1)), np.ones((3, 4))), (3, 4))
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assert_equal(_broadcast_shape(*([np.ones((1, 2))] * 32)), (1, 2))
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assert_equal(_broadcast_shape(*([np.ones((1, 2))] * 100)), (1, 2))
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# FIXME more than 32 args is broken!
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# assert_equal(_broadcast_shape(*([np.ones((1, 2))] * 100)), (1, 2))
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# regression tests for gh-5862
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assert_equal(_broadcast_shape(*([np.ones(2)] * 32 + [1])), (2,))

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