157 

   157 

   158 

   158 

   159 # base commands ###############################################################

   159 # base commands ###############################################################

   160 

   160 

   161 def version_strictly_lower(a,b):

   161 def version_strictly_lower(a,b):

   162     if a:

   163     if a:

   164     if b:

   165     if b:

   166     return a < b

   167     return a < b

   167 

   168 

   168 def max_version(a, b):

   169 def max_version(a, b):

   170 

   172 

   171 class ConfigurationProblem(object):

   173 class ConfigurationProblem(object):

   172     """Each cube has its own list of dependencies on other cubes/versions.

   174     """Each cube has its own list of dependencies on other cubes/versions.

   173 

   175 

   174     The ConfigurationProblem is used to record the loaded cubes, then to detect

   176     The ConfigurationProblem is used to record the loaded cubes, then to detect