implement len(cython.view.array) as it seems weird that it is supported for...

implement len(cython.view.array) as it seems weird that it is supported for memoryviews but not the array type

Cython/Utility/MemoryView.pyx

@@ -225,6 +225,8 @@ cdef class array:
         flags =  PyBUF_ANY_CONTIGUOUS|PyBUF_FORMAT|PyBUF_WRITABLE
         return  memoryview(self, flags, self.dtype_is_object)
 
+    def __len__(self):
+        return self._shape[0]
 
     def __getattr__(self, attr):
         return getattr(self.memview, attr)

tests/memoryview/cythonarray.pyx

@@ -10,6 +10,20 @@ cimport cython as cy
 include "cythonarrayutil.pxi"
 
 
+def length(shape):
+    """
+    >>> len(length((2,)))
+    2
+    >>> len(length((2,3)))
+    2
+    >>> len(length((5,3,2)))
+    5
+    """
+    cdef array cvarray = array(shape=shape, itemsize=sizeof(int), format="i", mode='c')
+    assert len(cvarray) == shape[0]
+    return cvarray
+
+
 def contiguity():
     '''
     >>> contiguity()