python scipy 报错不知道为啥

Question

>>> from scipy import io as spio
>>> from numpy as np
  File "<stdin>", line 1
    from numpy as np
                ^
SyntaxError: invalid syntax
>>> import numpy as np
>>> x=np.ones((3,3))
>>> spio.savemat('f.mat',{'a':a})
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
NameError: name 'a' is not defined

Answer 1

spio.savemat('f.mat',{'a':a})

a这个value没有定义

Answer 2

1. 只有import XXX as xxx 这样的写法
2. 变量a没有引用任何对象

Answer 3

1.语法问题

from numpy as np

改成

import numpy as np

2.引用未定义的 a

# 冒号后面的 a 没有定义
spio.savemat('f.mat',{'a':a})