base_test.py 文件源码

def __init__(self, shape, typechar, itemsize):
            import ctypes

            ndim = len(shape)
            self.ndim = ndim
            self.shape = tuple(shape)
            array_len = 1
            for d in shape:
                array_len *= d
            self.size = itemsize * array_len
            self.parent = ctypes.create_string_buffer(self.size)
            self.itemsize = itemsize
            strides = [itemsize] * ndim
            for i in range(ndim - 1, 0, -1):
                strides[i - 1] = strides[i] * shape[i]
            self.strides = tuple(strides)
            self.data = ctypes.addressof(self.parent), False
            if self.itemsize == 1:
                byteorder = '|'
            elif sys.byteorder == 'big':
                byteorder = '>'
            else:
                byteorder = '<'
            self.typestr = byteorder + typechar + str(self.itemsize)