numpy处理数据的记录

1. 浅拷贝和深拷贝

   a = np.array([1, 6])
   b = a		# 引用
   print(b)	# [1 6]
   a[0] = 2
   print(b)	# [2 6]
   b[1] = 3
   print(a)	# [2 3]
   
   b = a.copy()	# 复制
   

2. 插入一行（一列）

   a = np.array([[1, 9, 2], [5, 6, 3]])
   a = np.vstack((a, [0, 0, 0]))	# 尾部插入一行
   # a = np.hstack((a, [[0], [0]]))	# 最右端插入一列
   

3. reshape

   a = np.arange(12)
   a = np.reshape(a, (3, 4))
   a = a.reshape(2, 6)
   

4. 待定