Hi Alexandre, I went to look at PythonBridge and it promises to be massively interesting! Definitely much more systematic than the crude and primitive PyStGateway I hacked together for the MachineArithmetic package. However, I must be doing something stupid. As PythonBridge's "Getting Started" page tells me, I loaded the metacello: |Metacello new baseline: 'PythonBridge'; repository: 'github://ObjectProfile/PythonBridge/src'; load.| so now I have PythonBridge master and Python3Generator v2.0.0 in my Pharo 7 image. Ok nice. However, PBApplication class does not implement #installPipenvEnvironment, so |(Smalltalk at: #PBApplication) installPipenvEnvironment| results in MNU. In fact there are no implementors of #installPipenvEnvironment. How would you suggest to debug this? Regards, Boris