embed list in a string and run it with exec on python

Question

I was Trying to Make an python line as String and run it using exec(), that string was supposed to invoke a module and pass parameters ,here the parameter is a list and when i inject in string and call exec on it .. i'm getting - TypeError: can only concatenate str (not "list") to str

my code :

def skill_manager(skill_name,parameter_list):
    skill_name = skill_name[0]
    print(parameter_list)
    importline = "import skill."+skill_name+" as skill"
    exec(importline)

    if not skill_name == None:
        runline = "skill." + skill_name + "(" +"'"+ parameter_list + "'" + ")"        
        print(runline)
        exec(runline)

error :

..... line 40, in skill_manager
runline = "skill." + skill_name + "(" +"'"+ parameter_list + "'" + ")"        
TypeError: can only concatenate str (not "list") to str

code error

i tried converting list into string and otherside of code back to list .. but it has to be done in all skills ..

i somehow need to pass list from the skill_manager()