[v2pymtl] fixed slice indexing and uint bug in pyx gen
[v2pymtl] fixed slice indexing and uint bug in pyx gen

jck/pymtl,cornell-brg/pymtl,cornell-brg/pymtl,12yujim/pymtl,Abhinav117/pymtl,Abhinav117/pymtl,Abhinav117/pymtl,tj93/pymtl,jjffryan/pymtl,tj93/pymtl,Glyfina-Fernando/pymtl,jjffryan/pymtl,jck/pymtl,jjffryan/pymtl,cfelton/pymtl,cfelton/pymtl,tj93/pymtl,12yujim/pymtl,12yujim/pymtl,cfelton/pymtl,Abhinav117/pymtl,jck/pymtl,Glyfina-Fernando/pymtl,Glyfina-Fernando/pymtl,cornell-brg/pymtl