old_contents: """:mod:`krcurrency.constants` --- Constants for krcurrency
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  """
  from enum import Enum
  
  class CurrencyCode(Enum):
      USD = 'USA'
      JPY = 'Japan'
      EUR = 'EU'
      GBP = 'England'
      CAD = 'Canada'
      CHF = 'Swiss'
      HKD = 'Hongkong'
      CNY = 'China'
      THB = 'Thailand'
      IDR = 'Indonesia'
      SEK = 'Sweden'
      AUD = 'Austraila'
      DKK = 'Denmark'
      NOK = 'Norway'
      SAR = 'Saudi'
      KWD = 'Kuwait'
      BHD = 'Bahrain'
      AED = 'U.A.E'
      SGD = 'Singapore'
      MYR = 'Malaysia'
      NZD = 'NewZealand'
      TWD = 'Taiwan'
      PHP = 'Philippines'
      VND = 'Vietnam'
      PLN = 'Poland'
      RUB = 'Russia'
      ZAR = 'South Africa'
      INR = 'India'
      PKR = 'Pakistan'
      BDT = 'Bangladesh'
      EGP = 'Egypt'
      MXN = 'Mexico'
      BRL = 'Brazil'
      BND = 'Brunei'
      ILS = 'Israel'
      JOD = 'Jordan'
      CZK = 'the Czech Republic'
      MNT = 'Mongolia'
      FJD = 'Fiji'
      KHR = 'Cambodia'
      TRY = 'Turkey'
      HUF = 'Hungary'
      QAR = 'Qatar'
      XAU = 'GOLD 1g'
      XAG = 'SILVER 1g'
  
new_contents: """:mod:`krcurrency.constants` --- Constants for krcurrency
  ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
  
  """
  from enum import Enum
  
  class CurrencyCode(Enum):
      USD = 'USA'
      JPY = 'Japan'
      EUR = 'EU'
      GBP = 'England'
      CAD = 'Canada'
      CHF = 'Swiss'
      HKD = 'Hongkong'
      CNY = 'China'
      THB = 'Thailand'
      IDR = 'Indonesia'
      SEK = 'Sweden'
      AUD = 'Austraila'
      DKK = 'Denmark'
      NOK = 'Norway'
      SAR = 'Saudi'
      KWD = 'Kuwait'
      BHD = 'Bahrain'
      AED = 'U.A.E'
      SGD = 'Singapore'
      MYR = 'Malaysia'
      NZD = 'NewZealand'
      TWD = 'Taiwan'
      PHP = 'Philippines'
      VND = 'Vietnam'
      PLN = 'Poland'
      RUB = 'Russia'
      ZAR = 'South Africa'
      INR = 'India'
      PKR = 'Pakistan'
      BDT = 'Bangladesh'
      EGP = 'Egypt'
      MXN = 'Mexico'
      BRL = 'Brazil'
      BND = 'Brunei'
      ILS = 'Israel'
      JOD = 'Jordan'
      CZK = 'the Czech Republic'
      MNT = 'Mongolia'
      FJD = 'Fiji'
      KHR = 'Cambodia'
      TRY = 'Turkey'
      HUF = 'Hungary'
      QAR = 'Qatar'
      XAU = 'GOLD 1g'
      XAG = 'SILVER 1g'
  
      @classmethod
      def ismember(cls, currency):
          """"""
          currency = currency.upper()
          return currency in cls.__members__
  
subject: Add a classmethod that checks currency