if (tn.read_until('>')):

action1

else:

action2

or

if (tn.read_until() == '>'):

action1

else:

action2

I just want the read_until() to check which desired String comes first, and do different actions.

Or is there any equivalent ways?

解決方案

Look at the docs. Read until wants the expected string as a positional argument and an optional timeout. I would do it like this:

>>> try:

... response = tn.read_until(">", timeout=120) #or whatever timeout you choose.

... except EOFError as e:

... print "Connection closed: %s" % e

>>> if ">" in response:

... action1

... else:

... action2

If you want multiple different characters you can use read_some()

>>> while True: #really you should set some sort of a timeout here.

... r = tn.read_some()

... if any(x in r for x in ["#", ">"]):

... break

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