How to inspect defined constraints in python?

Is there any way to inspect model and see what constraints have been defined?

For instance, https://github.com/google/or-tools/blob/stable/examples/python/sudoku_sat.py defines the following:

# AllDifferent on rows.
for i in line:
    model.AddAllDifferent(grid[(i, j)] for j in line)

Does this create some observable entity in model (e.g. i number of entity-constraints)?

>Solution :

You can scan the underlying cp_model protobuf.

see model.Proto()