Function to_py_error 

pub fn to_py_error(err: CoreError) -> PyErr

Maps a CoreError onto the matching Python exception.

I/O failures become IOError; everything else becomes ValueError, preserving the exception types the bindings raised before the migration. (A From<CoreError> for PyErr impl is not possible here because of the orphan rule, so binding methods use this with map_err.)

引数

• err - The core error to convert.

戻り値

The equivalent Python exception.