Every now and then I wrote code like this:

```
import numpy as np   
a = np.array([1,2,3])
a[1]=3.3
a[2] *= 50
print(a)

```

Here I do not inted `a` to be initalized as `int`, but as `float`, but as I said I forget it.

Now is there a way to make sure such initializations default to float, unless dtype is explicitly specified?