Hi,
I have list 
my_list = [ [1,2,3,4,5,6], [1,3,4],[34,56,56,56]]
for item in my_list:
    var1,var2,var3,var4,var5,var6 = None
     if len(item) ==1:
          var1 = item[0]
     if len(item) == 2:
          var1 = item[0]
          var2  = item[1]
     if len(item) == 3:
         var1 = item[0]
         var2 = item[1]
         var3 = item[2]
     if len(item) == 4:
        var1 = item[0]
        var2 = item[1]
        var3 = item[2]
        var4 = item[3]
    fun(var1,var2,var3,var4,var5,var6)
I have a function 
def fun(var1, var2 = None, var3 = None, var4 = None, var5=None, var6= None)
Depending upon the values in my inner list. I am passing it to function. 
I hope I made it clear.
Thanks