from enum import Enum
 
class Values():
  values={'B':1}
  @staticmethod
  def getValues():
    if len(Values.values)<=1:
      kbunits=['KB','MB','GB','TB','PB','EB','ZB','YB','BB','NB','DB']
      kibunits=['KiBi','MiB','GiB','TiB','PiB','EiB','ZiB','YiB','BiB','NiB','DiB']
      for index,unit in enumerate(kibunits):
        Values.values[unit]=1<<(index+1)*10
      for index,unit in enumerate(kbunits):
        Values.values[unit]=10**((index+1)*3)
    return Values.values
  @staticmethod
  def get(key):
    return Values.getValues().get(key)
  
class Units(Enum):
 
  def __new__(cls,name):
    obj = object.__new__(cls)
    print (name)
    obj._value_=Values.get(name)
    return obj
  B=('B')
  KB=('KB')
  KiB=('KiBi')
  MB=('MB')
  MiB=('MiB')
  GB=('GB')
  GiB=('GiB')
  TB=('TB')
  TiB=('TiB')
  PB=('PB')
  PiB=('PiB')
  EB=('EB')
  EiB=('EiB')
  ZB=('ZB')
  ZiB=('ZiB')
  YB=('YB')
  YiB=('YiB')
  BB=('BB')
  BiB=('BiB')
  NB=('NB')
  NiB=('NiB')
  DB=('DB')
  DiB=('DiB')
 
class ByteUnitConversionUtil():
  __defaultformat="%.5f"
  @staticmethod
  def convert(value,unit=Units.B,format=__defaultformat):
    if(unit==Units.B):
      return str(value).split(".",2)[0]+unit.name
    else:
      return (format % (value/unit.value))+unit.name
    
if __name__=="__main__":
  print(ByteUnitConversionUtil.convert(12313213453,Units.KiB,"%.2f"))