Python count elements between values

I have a sorted list. For example, my list is:

my_list = [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

Actually, I have list of objects of my class with int property, on which the list is sorted.

I want to calculate number of objects, which have value of this property between two values.

I looking for the following python equivalent.

int main [] {
  int myints[] = {10,20,30,30,20,10,10,20};
  std::vector v[myints,myints+8];           // 10 20 30 30 20 10 10 20

  std::sort [v.begin[], v.end[]];                // 10 10 10 20 20 20 30 30

  std::vector::iterator low,up;
  low=std::lower_bound [v.begin[], v.end[], 20]; //          ^
  up= std::upper_bound [v.begin[], v.end[], 20]; //                   ^

  std::cout