text: """
  This file is part of Buttonwood.
  
  Buttonwood is a python software package created to help quickly create, (re)build, or 
  analyze markets, market structures, and market participants. 
  
  MIT License
  
  Copyright (c) 2016-2020 Peter F. Nabicht
  
  Permission is hereby granted, free of charge, to any person obtaining a copy
  of this software and associated documentation files (the "Software"), to deal
  in the Software without restriction, including without limitation the rights
  to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
  copies of the Software, and to permit persons to whom the Software is
  furnished to do so, subject to the following conditions:
  
  The above copyright notice and this permission notice shall be included in all
  copies or substantial portions of the Software.
  
  THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
  OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  SOFTWARE.
  """
  
  
  class Side(object):
      BID = 0
      ASK = 1
  
      SIDE_STR = {BID: "Bid", ASK: "Ask"}
      ABBREVIATED_SIDE_STR = {BID: "B", ASK: "A"}
  
      def __init__(self, bid_or_ask):
          assert bid_or_ask in [0, 1]
          self.__bid_or_ask = bid_or_ask
          self._is_bid = self.__bid_or_ask == self.BID
  
      def is_bid(self):
          return self._is_bid
  
      def is_ask(self):
          return not self._is_bid
  
      def is_other_side(self, side):
          if self.is_bid() and side.is_ask():
              return True
          if self.is_ask() and side.is_bid():
              return True
          return False
  
      def other_side(self):
          if self.__bid_or_ask == self.BID:
              return ASK_SIDE
          else:
              return BID_SIDE
  
      def __int__(self):
          if self.__bid_or_ask == self.BID:
              return self.BID
          else:
              return self.ASK
  
      def __str__(self):
          return self.SIDE_STR[self.__bid_or_ask]
  
      def __repr__(self):
          return self.__str__()
  
      def __eq__(self, other):
          if self.is_bid() and other.is_bid():
              return True
          if self.is_ask() and other.is_ask():
              return True
          return False
  
      def __ne__(self, other):
          return not self.__eq__(other)
  
      def __hash__(self):
          return self.__bid_or_ask
  
      def abbreviated_str(self):
          return self.ABBREVIATED_SIDE_STR[self.__bid_or_ask]
  
  
  BID_SIDE = Side(Side.BID)
  ASK_SIDE = Side(Side.ASK)
  
  
  def get_side(side_str):
      """
      Get's the side based on the string that is passed in. Can return None. Not case sensitive.
   
      Bids: b, bid, buy
      Asks: a, ask, sell
   
      :param side_str: str
      :return: Side (can be None)
      """
      assert type(side_str) is str
      use_str = side_str.lower()
      if use_str in ["b", "bid", "buy"]:
          return BID_SIDE
      if use_str in ["a", "ask", "sell", "offer", "s"]:
          return ASK_SIDE
      return None
  