Visualize the difference of bankers vs. half up vs. half down vs. no rounding averages.

rounding.py

import math


class deciamlRounding():

	def __init__(self, nums = [3.5, 4.5, 5.5, 6.5, 7.5, 8.5, 9.5, 10.5, 11.5, 13.5, 14.5, 15.5, 16.5, 17.5, 18.5, 19.5, 20.5, 21.5, 22.5, 24.5, 25.5]):
		self.nums = nums

		# hold the averages
		self.no_rounding_avg = float(0.0)
		self.bankers_rounding_avg = float(0.0)
		self.round_up_avg = float(0.0)
		self.round_down_avg = float(0.0)

	def round_down(self, x):
		if (x % 1 > 0.5):
			return math.ceil(x)
		return math.floor(x)

	def round_up(self, x):
		if (x % 1 < 0.5):
			return math.floor(x)
		return math.ceil(x)

	def calulate(self):
		for num in self.nums:
			self.no_rounding_avg += num
			self.bankers_rounding_avg += round(num)
			self.round_down_avg += self.round_down(num)
			self.round_up_avg += self.round_up(num)

		self.no_rounding_avg = round(self.no_rounding_avg / len(self.nums), 3)
		self.bankers_rounding_avg = round(self.bankers_rounding_avg / len(self.nums), 3)
		self.round_up_avg = round(self.round_up_avg / len(self.nums), 3)
		self.round_down_avg = round(self.round_down_avg / len(self.nums), 3)


def example_one():
	dr = deciamlRounding()
	# take a look at the array of numbers
	print(dr.nums)
	dr.calulate()
	# visualize the difference
	print("No rounding: %s"% dr.no_rounding_avg)
	print("Bankers rounding: %s"% dr.bankers_rounding_avg)
	print("Half up rounding: %s"% dr.round_up_avg)
	print("Half down rounding: %s"% dr.round_down_avg)

def example_two():
	dr = deciamlRounding(nums = [3.4, 4.5, 5.6, 6.4, 7.5, 8.6, 9.4, 10.5, 11.6, 13.4, 14.5, 15.6, 16.4, 17.5, 18.6, 19.4, 20.5, 21.6, 22.4, 24.5, 25.6])
	# take a look at the array of numbers
	print(dr.nums)
	dr.calulate()
	# visualize the difference
	print("No rounding: %s"% dr.no_rounding_avg)
	print("Bankers rounding: %s"% dr.bankers_rounding_avg)
	print("Half up rounding: %s"% dr.round_up_avg)
	print("Half down rounding: %s"% dr.round_down_avg)

if __name__ == "__main__":
	example_one()
	example_two()