leap.md

Concepts of leap

Example implementation

From the current example.py:

def leap(year):
    return year % 4 == 0 and (year % 100 != 0 or year % 400 == 0)

Concepts

• [Functions][functions]: the exercise relies on a def statement to create a named function
• [Parameters][parameters]: the exercise requires a single positional parameter in the function signature
• [Return Value][return-value]: the exercise must use a return statement to return a value to the caller
• [Expressions][expressions]: the exercise relies on writing an expression that will be evaluated to a return value
• [Modular Division][modular-division]: the exercise relies on the % operator to check if one number is evenly divisible by another
• [Boolean Operators][boolean-operators]: the exercise relies on and, or, and (optionally) not to form Boolean predicates
• [Boolean Logic][boolean-logic]: the exercise relies on and and or to combine Boolean predicates into a single logical answer
• [Comparison][comparison]: the exercise relies on the == and != operators to make binary comparisons between values
• [Equivalence][equivalence]: the exercise relies on the == and != operators to check that two values are equivalent (or not)
• [Order of Evaluation][order-of-evaluation]: the exercise relies on parentheses to explicitly modify the normal order of evaluation of an expression
• [Operator Precedence][operator-precedence]: the exercise is most simply stated when the student understands the operator precedence binding rules of Python
• [Short-Circuiting][short-circuiting]: the exercise relies on short-circuiting to avoid unnecessary calculations
• [Generics][generics]: the exercise is polymorphic across numerical types (ie int, float, Decimal)
• [Duck Typing][duck-typing]: the exercise supports any argument that supports modular division and comparison to integers (ie int, float, Decimal)