Answer:
Following are the missing code to this question: 
break;
Step-by-step explanation: 
In the given python code, a method "retry" is defined, that accepts two-variable, that is "operation and attempts" in its parameters, inside the method a for loop is defined that uses the n variable to holds attempt values and define the conditional statement. 
- Inside if block, it checks if the operation value is true, it will print a successful attempts values and break the condition, otherwise it will goto else block. 
 - In the else block, it will print failed attempts values.