On Wednesday, March 6, 2019 at 5:31:19 PM UTC+1, E. Madison Bray wrote:
>
> On Tuesday, March 5, 2019 at 4:47:39 PM UTC+1, benyamin alizade wrote:
>>
>> It gives no result, and when I interrupt it, the following error appears:
>>
>>
>> ---------------------------------------------------------------------------
>> EOF Traceback (most recent call
>> last)
>> <ipython-input-2-8f0455f97669> in <module>()
>> ----> 1 maple('2*3')
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc
>>
>> in __call__(self, x, name)
>> 278
>> 279 if isinstance(x, string_types):
>> --> 280 return cls(self, x, name=name)
>> 281 try:
>> 282 return self._coerce_from_special_method(x)
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
>>
>> in __init__(self, parent, value, is_name, name)
>> 1436 else:
>> 1437 try:
>> -> 1438 self._name = parent._create(value, name=name)
>> 1439 # Convert ValueError and RuntimeError to TypeError for
>> 1440 # coercion to work properly.
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/interface.pyc
>>
>> in _create(self, value, name)
>> 474 def _create(self, value, name=None):
>> 475 name = self._next_var_name() if name is None else name
>> --> 476 self.set(name, value)
>> 477 return name
>> 478
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/maple.pyc
>>
>> in set(self, var, value)
>> 622 """
>> 623 cmd = '%s:=%s:' % (var, value)
>> --> 624 out = self.eval(cmd)
>> 625 if out.find("error") != -1:
>> 626 raise TypeError("Error executing code in
>> Maple\nCODE:\n\t%s\nMaple ERROR:\n\t%s" % (cmd, out))
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
>>
>> in eval(self, code, strip, synchronize, locals, allow_use_file,
>> split_lines, **kwds)
>> 1350 elif split_lines:
>> 1351 return '\n'.join([self._eval_line(L,
>> allow_use_file=allow_use_file, **kwds)
>> -> 1352 for L in code.split('\n')
>> if L != ''])
>> 1353 else:
>> 1354 return self._eval_line(code,
>> allow_use_file=allow_use_file, **kwds)
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/maple.pyc
>>
>> in _eval_line(self, line, allow_use_file, wait_for_prompt,
>> restart_if_needed)
>> 574 with gc_disabled():
>> 575 z = Expect._eval_line(self, line,
>> allow_use_file=allow_use_file,
>> --> 576
>> wait_for_prompt=wait_for_prompt).replace('\\\n','').strip()
>> 577 if z.lower().find("error") != -1:
>> 578 raise RuntimeError("An error occurred running a
>> Maple command:\nINPUT:\n%s\nOUTPUT:\n%s" % (line, z))
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/expect.pyc
>>
>> in _eval_line(self, line, allow_use_file, wait_for_prompt,
>> restart_if_needed)
>> 982 out = ''
>> 983 except KeyboardInterrupt:
>> --> 984 self._keyboard_interrupt()
>> 985 raise KeyboardInterrupt("Ctrl-c pressed while running
>> %s"%self)
>> 986 if self._terminal_echo:
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/sage/interfaces/maple.pyc
>>
>> in _keyboard_interrupt(self)
>> 333 print("Interrupting %s..." % self)
>> 334 self._expect.sendline(chr(3)) # send ctrl-c
>> --> 335 self._expect.expect(self._prompt)
>> 336 raise RuntimeError("Ctrl-c pressed while running %s" %
>> self)
>> 337
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/pexpect/spawnbase.pyc
>> in expect(self, pattern, timeout, searchwindowsize, async_, **kw)
>> 339 compiled_pattern_list = self.compile_pattern_list(pattern)
>> 340 return self.expect_list(compiled_pattern_list,
>> --> 341 timeout, searchwindowsize, async_)
>> 342
>> 343 def expect_list(self, pattern_list, timeout=-1,
>> searchwindowsize=-1,
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/pexpect/spawnbase.pyc
>> in expect_list(self, pattern_list, timeout, searchwindowsize, async_, **kw)
>> 367 return expect_async(exp, timeout)
>> 368 else:
>> --> 369 return exp.expect_loop(timeout)
>> 370
>> 371 def expect_exact(self, pattern_list, timeout=-1,
>> searchwindowsize=-1,
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/pexpect/expect.pyc in
>> expect_loop(self, timeout)
>> 115 timeout = end_time - time.time()
>> 116 except EOF as e:
>> --> 117 return self.eof(e)
>> 118 except TIMEOUT as e:
>> 119 return self.timeout(e)
>>
>> /opt/sagemath-8.5/local/lib/python2.7/site-packages/pexpect/expect.pyc in
>> eof(self, err)
>> 61 if err is not None:
>> 62 msg = str(err) + '\n' + msg
>> ---> 63 raise EOF(msg)
>> 64
>> 65 def timeout(self, err=None):
>>
>> EOF: End Of File (EOF). Exception style platform.
>> Maple with PID 5472 running /cygdrive/c/Program Files (x86)/Maple
>> 17/bin.win/maple -t -c interface(screenwidth=infinity,errorcursor=false)
>> command: /cygdrive/c/Program Files (x86)/Maple 17/bin.win/maple
>> args: ['/cygdrive/c/Program Files (x86)/Maple 17/bin.win/maple', '-t',
>> '-c', 'interface(screenwidth=infinity,errorcursor=false)']
>> buffer (last 100 chars): ''
>> before (last 100 chars): '\r\n'
>> after: <class 'pexpect.exceptions.EOF'>
>> match: None
>> match_index: None
>> exitstatus: None
>> flag_eof: True
>> pid: 5472
>> child_fd: 10
>> closed: False
>> timeout: None
>> delimiter: <class 'pexpect.exceptions.EOF'>
>> logfile: None
>> logfile_read: None
>> logfile_send: None
>> maxread: 4194304
>> ignorecase: False
>> searchwindowsize: None
>> delaybeforesend: None
>> delayafterclose: 0.1
>> delayafterterminate: 0.1
>> searcher: searcher_re:
>> 0: re.compile('#-->')
>>
>>>
>>>
> It looks to me like pexpect is just waiting forever for a prompt and not
> receiving one. The best thing to do I think would be to run it more
> directly and see what it's outputting. Perhaps even it's something as
> simple as, the prompt is something other than "#-->". So pexpect will just
> sit there until something resembling the "#-->" appears on its stdin
> stream.
>
I almost forgot the most important point! If you want to interact "more
directly" what I wrote above, you can use the `ptyprocess` module directly,
which is what pexpect (and by extension Sage's interface to maple) is
using. For example to start process with a PTY from Python/sage:
sage: import ptyprocess
sage: p = ptyprocess.PtyProcess.spawn(['/cygdrive/c/Program Files
(x86)/Maple 17/bin.win/maple', '-t', '-c',
'interface(screenwidth=infinity,errorcursor=false)'])
then to see the process's output:
sage: p.read()
<something>
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