anchor.diff:  
     sqlalchemy = self.sqlalchemy9.override rec {
       name = "SQLAlchemy-0.7.10";
  -    disabled = isPy34;
  +    disabled = isPy34 || isPy35;
       doCheck = !isPyPy;
   
       src = pkgs.fetchurl {
  
positive.code:   IMAPClient = buildPythonPackage rec {
      name = "IMAPClient-${version}";
      version = "0.11";
      disabled = isPy34;
  
      src = pkgs.fetchurl {
        url = "http://freshfoo.com/projects/IMAPClient/${name}.tar.gz";
  
negative.code: 
    sqlalchemy8 = self.sqlalchemy9.override rec {
      name = "SQLAlchemy-0.8.7";
      disabled = isPy34 || isPy35;
      doCheck = !isPyPy;
  
      src = pkgs.fetchurl {
  