I have a python module imported by a SageMath notbook and in this module, I import and use Sage functionality via `from sage.all import *`

.

Most functions work fine, however when I try to obtain a `RealNumber`

such as in the following code:

```
from sage.rings.real_mpfr import RealNumber
# ...
test = RealNumber(1.2)
```

I get this error:

```
TypeError: Cannot convert float to sage.rings.real_mpfr.RealField_class
```

I've tried using strings as well and that didn't work either.
Note that to use `RealNumber`

I need to import it explicitly (it's not included in `sage.all`

).

### Question:

How can I use `RealNumber`

in my Python module?