unpickable basic types => confusing err

[pedronis]

BPO	520645
Nosy	@gvanrossum

^{Note: these values reflect the state of the issue at the time it was migrated and might not reflect the current state.}

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GitHub fields:

assignee = 'https://github.com/gvanrossum'
closed_at = <Date 2002-06-28.08:27:46.000>
created_at = <Date 2002-02-20.21:00:49.000>
labels = ['interpreter-core']
title = 'unpickable basic types => confusing err'
updated_at = <Date 2002-06-28.08:27:46.000>
user = 'https://bugs.python.org/pedronis'

bugs.python.org fields:

activity = <Date 2002-06-28.08:27:46.000>
actor = 'nobody'
assignee = 'gvanrossum'
closed = True
closed_date = None
closer = None
components = ['Interpreter Core']
creation = <Date 2002-02-20.21:00:49.000>
creator = 'pedronis'
dependencies = []
files = []
hgrepos = []
issue_num = 520645
keywords = []
message_count = 3.0
messages = ['9333', '9334', '9335']
nosy_count = 3.0
nosy_names = ['gvanrossum', 'nobody', 'pedronis']
pr_nums = []
priority = 'normal'
resolution = 'fixed'
stage = None
status = 'closed'
superseder = None
type = None
url = 'https://bugs.python.org/issue520645'
versions = []

[pedronis]

E.g.

Python 2.2
>>> f=open('c:/autoexec.bat','r')
>>> w=open('c:/transit/p','w')
>>> import pickle as pic
>>> pic.dump(f,w)
Traceback (most recent call last):
<<snip>>
TypeError: coercing to Unicode: need string or buffer, 
file found
>>> import cPickle as cpic
>>> cpic.dump(f,w)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
  File "C:\USR\PYTHON22\lib\copy_reg.py", line 56, in 
_reduce
    state = base(self)
TypeError: coercing to Unicode: need string or buffer, 
file found

VS.

Python 2.1 
>>> f=open('c:/autoexec.bat','r')
>>> w=open('c:/transit/p','w')
>>> import pickle as pic
>>> pic.dump(f,w)
Traceback (most recent call last):
<<snip>>
pickle.PicklingError: can't pickle 'file' object: 
<open file 'c:/autoexec.bat',
mode 'r' at 00795290>
>>> import cPickle as cpic
>>> cpic.dump(f,w)
Traceback (most recent call last):
  File "<stdin>", line 1, in ?
cPickle.UnpickleableError: Cannot pickle <type 'file'> 
objects
>>>

[gvanrossum]

Logged In: YES
user_id=6380

I cannot reproduce this on the 2.2.1 branch or on the CVS
trunk. I believe it was fixed by rev. 2.10 of copy_reg.py
(without this even being the intention :-).

Closing.

[nobody]

Logged In: NO

I have the same error when I try to pickle libftp.FTP object.
It is possible bypass it?