np.array转换为list，嵌套的python list转成一个一维的python list

np.array转换为list

 1 meitan = shuju.iloc[start:end, 1:2]

 zhengqi = shuju.iloc[start:end,2:3]
 print(type(list(l)))
 newmeitan = np.array(meitan) #[[][][]]
 newzhengqi = np.array(zhengqi)#[[][][]]
 print("转换前",newzhengqi)
  newmeitan = newmeitan.reshape(1, len(newmeitan)).tolist()  # [[2,1,1]]

 newzhengqi = newzhengqi.reshape(1, len(newzhengqi)).tolist()  # [[2,1,1]]

   print("转换后",newzhengqi)

显示如下，第一个是转换前，第二个转化后
 1 转换前 [[ 63.13064957]
  [ 66.2085495 ]
  [ 67.42173767]
  [ 66.29841614]
  [ 67.2869339 ]
  [ 65.04029846]
  [ 67.9384613 ]
  [ 69.80317688]
  [ 66.47814941]]
 转换后 [[63.1306495666504, 66.2085494995117, 67.4217376708984, 66.2984161376953, 67.2869338989258, 65.0402984619141, 67.9384613037109, 69.8031768798828, 66.4781494140625]]

嵌套的python list转成一个一维的python list
1     x = [[2],[23],[3]]
     y = sum(x,[])
     print(y)

显示如下
1 [2, 23, 3]