xxx="%c%%c%%%%c";c=""=="";cc=c+c+c+c;x=cc+cc;cx=x+x+x+x;ec=cx+cx;ee=cx+x+cc;ex=ec+ee;xc=ex+c+c;xe=xc+c;xx=xc+cc;e=xxx%xe%ee%cx;cc+=cx+ec;ec+=x;x+=xe;e=""""%ce%%c%%%%c"""%ec%ex%ex+e+xxx%x%xe%xx;xe+=c;c+=cx;ee+=ec;e="%c%%c"%xc%ee+e+xxx%ex%cc%c+"""";""";c+=ec;e=xxx%xe%xx%c+e;exec""+e
Note that non-ascii characters in the above source code will be escaped (such as \x9f).