'import pyAgrum.lib.notebook as gnb' prints the prompt 'In :'

When I interactively run import pyAgrum.lib.notebook as gnb it doesn't just complete this command, but prints In :, which repeats when I hit 'Enter':

$ python3.7
Python 3.7.9 (default, Dec 12 2020, 01:25:17) 
[Clang 8.0.1 (tags/RELEASE_801/final 366581)] on freebsd12
Type "help", "copyright", "credits" or "license" for more information.
>>> import pyAgrum.lib.notebook as gnb
In : 
In : 
In : 
In : 

I am not a Python user, but I don't think that this is expected behavior.

Rev. fa7f4ae5