如果我使用一个简单而空的numpy数组,我可以看到它有96字节的开销,
>>> sys.getsizeof( np.array([]) )
96
96个字节存储了什么?在numpy或Python 3(cpython)的C源代码中的哪里进行设置?
数组在numpy / core / include / numpy / ndarraytypes.h]中的C源代码中存在]
参见:https://github.com/numpy/numpy/blob/master/numpy/core/include/numpy/ndarraytypes.h
看起来它有几个指针,维数和PyObject_HEAD,所有这些总和可能等于您看到的字节数。
/*
* The main array object structure.
*/
/* This struct will be moved to a private header in a future release */
typedef struct tagPyArrayObject_fields {
PyObject_HEAD
/* Pointer to the raw data buffer */
char *data;
/* The number of dimensions, also called 'ndim' */
int nd;
/* The size in each dimension, also called 'shape' */
npy_intp *dimensions;
/*
* Number of bytes to jump to get to the
* next element in each dimension
*/
npy_intp *strides;
PyObject *base;
/* Pointer to type structure */
PyArray_Descr *descr;
/* Flags describing array -- see below */
int flags;
/* For weak references */
PyObject *weakreflist;
} PyArrayObject_fields;