def test_evaluate_operators(self):
calculator = Calculator()
self.assertEqual(Decimal(3), calculator.evaluate("+3"))
self.assertEqual(Decimal(-3), calculator.evaluate("-3"))
self.assertEqual(Decimal(6), calculator.evaluate("2 * 3"))
self.assertEqual(Decimal(2), calculator.evaluate("6 / 3"))
self.assertEqual(Decimal(5), calculator.evaluate("2 + 3"))
self.assertEqual(Decimal(3), calculator.evaluate("7 - 4"))
def evaluate():
data = request.get_json()
expression = data['expression'];
calculator = Calculator(converter)
result = calculator.evaluate(expression)
return jsonify({'result': result})
def test_evaluate(self):
calculator = Calculator()
self.assertEqual(Decimal(4), calculator.evaluate("4"))
self.assertEqual(Decimal(21), calculator.evaluate("7 * 3"))
self.assertEqual(Decimal(11), calculator.evaluate("2 * 4 + 3"))
self.assertEqual(Decimal(45), calculator.evaluate("(3 * (2 + 5)) + 6 * (4)"))
self.assertEqual(Decimal("25.92"), calculator.evaluate("2.7 * (3.2 + 6.4)"))
self.assertEqual(Decimal(1), calculator.evaluate("-2 * -4 + -7"))
def test_evaluate_operator_precedences(self):
calculator = Calculator()
self.assertEqual(Decimal(-14), calculator.evaluate("-3 * 5 + +1"))
self.assertEqual(Decimal("6.5"), calculator.evaluate("8 / -16 - -7"))
self.assertEqual(Decimal(30), calculator.evaluate("5 * 3 * 8 / 4 / 2 * 6 / 3"))
self.assertEqual(Decimal(-3), calculator.evaluate("2 + 3 + 4 - 5 - 8 + 6 + 4 - 9"))
def test_evaluate_complex(test_input, expected):
"""Test evaluate() observes order of operations."""
calculator = Calculator(roman)
assert calculator.evaluate(test_input) == expected
def test_evaluate_simple(test_input, expected):
"""Test evaluate() performs basic math from string expression."""
calculator = Calculator(roman)
assert calculator.evaluate(test_input) == expected
import sys
from calculator.calculator import Calculator
__author__ = 'Frank van Heeswijk'
if __name__ == '__main__':
if len(sys.argv) < 2:
print("Usage: calculator_application \"<expression>\"")
sys.exit(1)
calculator = Calculator()
expression = " ".join(sys.argv[1:])
result = calculator.evaluate(expression)
print(result)
