file doesn't exist

[buran]

I changed line 16 and got this error.

why would you change it?

which line are you referring to?

As i said - line 17, in CLIENT code. Currently it reads:

        if data[:6] == 'EXISTS':

Also, what do you mean by PEP8 ?

https://www.python.org/dev/peps/pep-0008...mendations

Use ''.startswith() and ''.endswith() instead of string slicing to check for prefixes or suffixes.

startswith() and endswith() are cleaner and less error prone:

Yes: if foo.startswith('bar'):
No:  if foo[:3] == 'bar':