does not work output in Output.txt, IDE gives an error

ouf.write (result) io.unsupportedoperation: not writable

Code:

with open ('dataset_3363_2.txt') AS INF:
  DNK = inf.ReadLine ()
RESULT = ''
i = 0.
KOL = 0.
Let = ''
While I! = (Len (DNK) - 1):
  IF NOT ('0' & lt; = dnk [i] & lt; = '9'):
    For j in Range (0, KOL):
      Result + = Let
    Let = DNK [i]
    KOL = 0.
  ELSE:
    BUF = STR (KOL) + DNK [i]
    KOL = INT (BUF)
  I + = 1
For i in Range (0, KOL):
      Result + = Let
With Open ('Output.txt') AS OUF:
  OUF.WRITE (RESULT)

Answer 1, Authority 100%

You need to explicitly specify that you open the file to write:

with open ('output.txt', 'w') as ouf:
  OUF.WRITE (RESULT)