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.
Write a code or draw a flowchart to find all  Pythagorean Triples (a,b,c) where a
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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def load_input(input_str):    try:     x = int(input(input_str))     if x<5 or x>20:          raise ValueError     else:         return x   except ValueError:     print("Enter whole number between 5 to 20!")     raise upperBound = load_input('Input the value of upper bound: ') for a in range(1,upperBound-1):     for b in range(a+1, upperBound):         for c in range(b+1, upperBound+1):             if a*a + b*b == c*c:                 print("({a}, {b}, {c}) is a Pythagorean Triple".format(a=a,b=b,c=c))
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.