Using try and except statement for exception handling, using raise to throw out the exception and stop the program.

An if else statement is a conditional statement that runs a different set of statements depending on whether an expression is true or false.

The def keyword defines a function. A function is a group of statements that can be called upon repeatedly to perform a specific task.

The import keyword is used to import modules. You can choose to import parts from a module, by using the from keyword.

When two fair dice are rolled, let the sum of the number shown on each die be n. Write a code or draw a flowchart to find P(n). The input is n, where 2    n    12 and the output is P(n). 

The print built-in function displays the specified string to the output.

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Game Code

The for loop repeats codes within itself for a fixed number of times determined by the specified expression.

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from fractions import Fraction def load_input(input_str):    try:     x = int(input(input_str))     if x<2 or x>12:          raise ValueError     else:         return x;   except ValueError:     print("Enter integer between 2 to 12!")     raise n = load_input('Enter a positive integer n: ') sumOf2dices = [] for i in range(1,7):     for j in range(1,7):         sumOf2dices.append(i + j) frequencies = [0] * (1+max(sumOf2dices)) for i in sumOf2dices:     frequencies[i] += 1 if n >= len(frequencies) or n < 0:     probability = 0 else:     probability = Fraction(frequencies[n],36) print("The probability that the sum of the two numbers is equal to {n} is {probability}.".format(n=n, probability=probability))

A variable stores a value that can be referred to or modified later in the program. A name, output, is assigned to the variable as an identifier in this case.