``` python
In [7]: %%timeit
x = np.empty(10000, dtype=np.float)       
x[:] = 1.0  / 10000
   ...: 
100000 loops, best of 3: 16.5 us per loop

In [8]: timeit np.ones(10000, dtype=np.float)/ 10000
10000 loops, best of 3: 193 us per loop
```