gistfile1.txt

class TzMapper(object):
  def __init__(self, u_to_w):
      self.u_to_w = {(k.lower(),v) for k,v in u_to_w}
      self.w_to_u = {(v.lower(), k) for k,v in u_to_w}
  
  def add(self, k, v):
      self.u_to_w[k.lower()] = v
      self.w_to_u[v.lower()] = k
  
  def remove(self, k):
      self.w_to_u.pop(self.u_to_w.pop(k.lower()].lower())
  
  def get_win(self, key):
      return self.u_to_w[key.lower()]
   
  def get_unix(self, key):
      return self.w_to_u[key.lower()]
      
mapper = TzMapper({
   'abc': 'cdf'
})