new_contents: import ctypes
  import os
  
  # Error
  T_ERROR_SUCCESS        = 0 # Success
  T_ERROR_EMPTY          = 1 # Empty expression
  T_ERROR_DIVZERO        = 2 # Division by zero
  T_ERROR_TOKEN          = 3 # Unknown token type
  T_ERROR_FUNC           = 4 # Math function not found
  T_ERROR_FUNC_FACTORIAL = 5 # Argument to factorial must be positive
  T_ERROR_BRACKETS       = 6 # Unbalanced round brackets
  
  hDll = ctypes.windll.LoadLibrary("..\\..\\ExprSolver.dll")
  
  lpszExpr = "(1*2)*(6^5)+sin(30)+cos(2)*int(4.6)"
  
  ExprTestFunc = hDll["ExprSolver_Test"]
  ExprTestFunc.restype = ctypes.c_double
  
  dResult = ExprTestFunc(ctypes.c_char_p(lpszExpr))
  
  if hDll.ExprSolver_GetLastError() == 0:
      print "Test: " + str(dResult)
  else:
      print "Error"
  
  os.system("pause")
subject: Create sample file for Python