day2.py

#!/bin/python

class Submarine():
  def __init__(self):
    self.position={'horizontal': 0, 'depth': 0}
    self.aim=0
  def forward(self,amount):
    self.position['horizontal']+=amount
    self.position['depth']+=amount*self.aim
  def up(self,amount):
    self.aim-=amount
  def down(self,amount):
    self.aim+=amount
  def singleposition(self):
    return(self.position['depth']*self.position['horizontal'])
  def runcommands(self, commands):
    for c in commands:
      getattr(self, c['command'])(c['amount'])

commands = []

with open('day2.txt') as f:
  for line in f:
      command = {}
      (c, a) = line.split()
      command['command'] = c
      command['amount'] = int(a)
      commands.append(command)

sub = Submarine()
sub.runcommands(commands)

print('Part Two: ',sub.singleposition())