docs: def from_str(cls, string):
          """
          Creates a mapping from a string
  
          Parameters
          ----------
          string : str
              String of the form `target<-clause` where `clause` is a valid string for :class:`caspo.core.clause.Clause`
  
          Returns
          -------
          caspo.core.mapping.Mapping
              Created object instance
          """
          if "<-" not in string:
              raise ValueError("Cannot parse the given string to a mapping")
  
          target, clause_str = string.split('<-')
  
          return cls(Clause.from_str(clause_str), target)