Решение задачи File 47

# -*- coding: utf-8 -*-
import sys

file1 = "file47_1.txt"
file2 = "file47_2.txt"

try:
    with open(file1, "rb") as f_in:
        data1 = f_in.read()

    with open(file2, "rb") as f_in:
        data2 = f_in.read()
                
    with open(file1, "ab") as f_out:
        f_out.write(data2)
                
    with open(file2, "ab") as f_out:
        f_out.write(data1)
                
except:
    print("Error: ", sys.exc_info())
									

program File47;
var
 N,i:Integer;
 Buf : Char;
 Name1,Name2: String;
 F1,F2,F_temp :File;
begin
  Write('File1: ');
  Readln(Name1);
  Write('File2: ');
  Readln(Name2);
  Assign(F1,Name1);
  Rename(F1,'~'+Name1);
  Assign(F2,Name2);
  Rename(F2,'~'+Name2);
  Assign(F_temp,Name1);
  Reset(F2,1);
  Reset(F1,1);
  ReWrite(F_temp,1);
  while not Eof(F1) do
   begin
    BlockRead(F1, Buf, SizeOf(char));
    BlockWrite(F_temp, Buf, sizeof(char));
   end;
  while not Eof(F2) do
   begin
    BlockRead(F2, Buf, SizeOf(char));
    BlockWrite(F_temp, Buf, sizeof(char));
   end;
   Close(F_temp);
   seek(F1,0);
   seek(F2,0);
  Assign(F_temp,Name2);
  ReWrite(F_temp,1);
  while not Eof(F2) do
   begin
    BlockRead(F2, Buf, SizeOf(char));
    BlockWrite(F_temp, Buf, sizeof(char));
   end;
  while not Eof(F1) do
   begin
    BlockRead(F1, Buf, SizeOf(char));
    BlockWrite(F_temp, Buf, sizeof(char));
   end;
  Close(F_temp);
  Close(F1);
  Close(F2);
  erase(F1);
  erase(F2);
end.