for x in [1,2,3]:
    print(x)

 1 #include <iostream>
 2 
 3 int main(int argc, char **argv)
 4 {
 5     for(auto n : {1,2,3,4,5,6})
 6     {
 7         std::cout<<n<<std::endl;
 8     }
 9 
10 }

vector<int> p={1,2,3};

vector<int> p;
p={1,2,3};

 1 template<typename T> class MyClass{
 2     public:
 3     vector<T> data;
 4     MyClass(initializer_list<T> li){data=li;cout<<"{}"<<endl;}
 5     MyClass(){}
 6     MyClass& operator=(initializer_list<T> li){data=li;cout<<"=="<<endl;}
 7 };
 8 
 9 
10 int main() {
11     MyClass<int> x={1,2,3};
12     MyClass<int> y;
13     y={2,3,4};
14     getchar();
15     return 0;
16 }