Python - sql anidados en bucles de python

for i in anio:

        for j in mes:

            cursor.execute("select fld_rut_cli, 2019 as anio, 6 as mes,   count(distinct fld_his_tel) as V_Canales_distintos ,count(*) as V_Total_ges_mes ,sum(case when fld_tip_ges=2 then 1 else 0 end) as V_gestion_Tel  ,sum(case when  fld_res_cli=1 and fld_tip_ges=2 then 1 else 0 end) as V_CD,sum(case when  fld_res_cli=2 and fld_tip_ges=2 then 1 else 0 end) as V_CInd  from dbo.tbl_historo1 WHERE year(fld_fec_res)=2019 and datepart(MONTH,fld_fec_res) between 3 and 6 group by  fld_rut_cli order by 1,4,3")

"cadena "+variable+" cadena"

"cadena %s cadena" % (variable)

"cadena ", variable, "cadena"

"cadena {} cadena".format(variable)