Fix some pyflakes errors

[twisted-trac]

	@rodrigc reported
Trac ID	trac#9960
Type	enhancement
Created	2020-09-15 01:11:58Z

This ticket focuses on a subset of the pyflakes errors identified in ticket:9952

docs/conch/examples/sshsimpleclient.py:62:26 undefined name 'raw_input'
docs/core/examples/bananabench.py:6:1 'sys' imported but unused
docs/core/examples/echoclient_udp.py:35:5 local variable 't' is assigned to but never used
docs/core/examples/ftpclient.py:18:1 'sys' imported but unused
docs/core/examples/sendfd.py:83:5 local variable 'port' is assigned to but never used
docs/core/examples/stdiodemo.py:40:9 local variable 'e' is assigned to but never used
docs/mail/examples/smtpclient_tls.py:11:1 'OpenSSL.SSL.SSLv3_METHOD' imported but unused

docs/words/examples/cursesclient.py:26:1 'time' imported but unused
docs/words/examples/cursesclient.py:26:1 'traceback' imported but unused
docs/words/examples/cursesclient.py:26:1 'sys' imported but unused
docs/words/examples/cursesclient.py:33:1 'twisted.python.log' imported but unused

Searchable metadata

trac-id__9960 9960
type__enhancement enhancement
reporter__rodrigc rodrigc
priority__normal normal
milestone__None None
branch__ 
branch_author__ 
status__closed closed
resolution__fixed fixed
component__core core
keywords__None None
time__1600132318240823 1600132318240823
changetime__1600197440582837 1600197440582837
version__None None
owner__None None

[twisted-trac]

	@rodrigc commented

#1387

[twisted-trac]

	@wsanchez commented

Nice cleanup

[twisted-trac]

	@wsanchez set status to closed