call site 19 for execnet.PopenGateway.remote_exec
execnet/testing/test_gateway.py - line 95
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   def test_correct_setup_no_py(self):
       channel = self.gw.remote_exec("""
               import sys
               channel.send(sys.modules.keys())
->         """) 
       remotemodules = channel.receive() 
       assert 'py' not in remotemodules, (
               "py should not be imported on remote side")