Решение задачи File 9

import random
import os

x1 = random.randrange(1,3)
file1_name = "file09_"+str(x1)+".txt"
print("Input file: ",file1_name)
try:
    if os.path.exists(file1_name):
        os.remove(file1_name)
        print("Deleted file: ",file1_name)
except IOError:
    print('Delete error:',file1_name)

print("Writing to file:",file1_name)
N = random.randrange(2,21)
try:
    f = open(file1_name, "w")
    try:
        for i in range(N):
            x = random.uniform(-100, 100)
            print(i,":",x)
            f.write(str(x)+"\n")
    finally:
        f.close()
except IOError:
    print('Write error: ',file1_name)

print()
print("Reading from file:",file1_name)
N = 0
try:
    with open(file1_name,'r') as f:
        for line in f:
            x = float(line)
            print(N,":",x)
            N += 1
            if N == 1:
                x_first = x
            else:
                x_last = x
except IOError:
    print('Open error: ',file1_name)

x2 = x1%2+1
file2_name = "file09_"+str(x2)+".txt"
print("Output file: ",file2_name)
print("Writing to file:",file2_name)
try:
    f = open(file2_name, "w")
    try:
        f.write(str(x_last)+"\n")
        print("Last:",x_last)
        f.write(str(x_first)+"\n")
        print("First:",x_first)
    finally:
        f.close()
except IOError:
    print('Write error: ',file2_name)
									

program File9;
var
 S1,S2:String;
 F_in,F_out: File of Real;
 R:Real;
 i:integer;
begin
  Write('File1: ');
  Readln(S1);
  Write('File2: ');
  Readln(S2);
  Assign(F_in,S1);
  {$I-}
  Reset(F_in);
  {$I+}
  if IOResult=0 then
   begin
    Assign(F_out,S2);
    ReWrite(F_out);
   end
  else
   begin
    Assign(F_in,S2);
    Reset(F_out);
    Assign(F_out,S1);
    ReWrite(F_out);
   end;
  Read (F_in,R);
  Write(F_out,R);
  while (not eof(F_in)) do Read(F_in,R);
  Write(F_out,R);
  Close(F_in);
  Close(F_out);
end.