On Sage 8.6 with Python 2, the following command produces the expected
result (namely, a sage.interfaces.gap.GapElement):
sage: gap('0')
0
whereas in Sage 8.6 with Python 3 I get the following error:
sage: gap('0')
---------------------------------------------------------------------------
FileNotFoundError Traceback (most recent call last)
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_start(self)
1239 # been upgraded.
-> 1240 if os.path.getmtime(WORKSPACE) < timestamp():
1241 raise OSError("GAP workspace too old")
/sage/local/lib/python3.6/genericpath.py in getmtime(filename)
54 """Return the last modification time of a file, reported by
os.stat()."""
---> 55 return os.stat(filename).st_mtime
56
FileNotFoundError: [Errno 2] No such file or directory:
'/home/sage/.sage/gap/gap-workspace-0x752c50fd99b2032f'
During handling of the above exception, another exception occurred:
UnicodeDecodeError Traceback (most recent call last)
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
__init__(self, parent, value, is_name, name)
1436 try:
-> 1437 self._name = parent._create(value, name=name)
1438 # Convert ValueError and RuntimeError to TypeError for
/sage/local/lib/python3.6/site-packages/sage/interfaces/interface.py in
_create(self, value, name)
483 name = self._next_var_name() if name is None else name
--> 484 self.set(name, value)
485 return name
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in set(self,
var, value)
1413 cmd = ('%s:=%s;;' % (var, value)).replace('\n','')
-> 1414 self._eval_line(cmd, allow_use_file=True)
1415
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
742 if self._expect is None:
--> 743 self._start()
744 E = self._expect
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_start(self)
1246 except OSError:
-> 1247 gap_reset_workspace(verbose=False)
1248
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
gap_reset_workspace(max_workspace_size, verbose)
1578 g = Gap(use_workspace_cache=False, max_workspace_size=None)
-> 1579 g.eval('SetUserPreference("HistoryMaxLines", 30)')
1580 from sage.tests.gap_packages import all_installed_packages
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
eval(self, x, newlines, strip, split_lines, **kwds)
582 input_line += ';'
--> 583 result = Expect.eval(self, input_line, **kwds)
584 if not newlines:
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
eval(self, code, strip, synchronize, locals, allow_use_file, split_lines,
**kwds)
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
<listcomp>(.0)
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
742 if self._expect is None:
--> 743 self._start()
744 E = self._expect
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_start(self)
1273 # set random seed
-> 1274 self.set_seed(self._seed)
1275
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
set_seed(self, seed)
1178 seed = self.rand_seed()
-> 1179 self.eval("Reset(GlobalMersenneTwister,%d)" % seed)
1180 self.eval("Reset(GlobalRandomSource,%d)" % seed)
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
eval(self, x, newlines, strip, split_lines, **kwds)
582 input_line += ';'
--> 583 result = Expect.eval(self, input_line, **kwds)
584 if not newlines:
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
eval(self, code, strip, synchronize, locals, allow_use_file, split_lines,
**kwds)
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
<listcomp>(.0)
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
754 # them (on Python 3), currently just using the default
encoding
--> 755 normal, error = bytes_to_str(normal),
bytes_to_str(error)
756
/sage/local/lib/python3.6/site-packages/sage/cpython/string.pxd in
sage.cpython.string.bytes_to_str
(build/cythonized/sage/cpython/string.c:1509)()
30
---> 31 cpdef inline str bytes_to_str(b, encoding=None, errors=None):
32 r"""
/sage/local/lib/python3.6/site-packages/sage/cpython/string.pxd in
sage.cpython.string.bytes_to_str
(build/cythonized/sage/cpython/string.c:1393)()
59 else:
---> 60 return _cstr_to_str(<bytes>b, encoding, errors)
61
UnicodeDecodeError: 'utf-8' codec can't decode byte 0x80 in position 15:
invalid start byte
During handling of the above exception, another exception occurred:
TypeError Traceback (most recent call last)
<ipython-input-1-051215b8675e> in <module>()
----> 1 gap('0')
/sage/local/lib/python3.6/site-packages/sage/interfaces/interface.py in
__call__(self, x, name)
286
287 if isinstance(x, string_types):
--> 288 return cls(self, x, name=name)
289 try:
290 return self._coerce_from_special_method(x)
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
__init__(self, parent, value, is_name, name)
1440 except (RuntimeError, ValueError) as x:
1441 self._session_number = -1
-> 1442 raise_(TypeError, TypeError(*x.args),
sys.exc_info()[2])
1443 except BaseException:
1444 self._session_number = -1
/sage/local/lib/python3.6/site-packages/six.py in reraise(tp, value, tb)
690 value = tp()
691 if value.__traceback__ is not tb:
--> 692 raise value.with_traceback(tb)
693 raise value
694 finally:
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
__init__(self, parent, value, is_name, name)
1435 else:
1436 try:
-> 1437 self._name = parent._create(value, name=name)
1438 # Convert ValueError and RuntimeError to TypeError for
1439 # coercion to work properly.
/sage/local/lib/python3.6/site-packages/sage/interfaces/interface.py in
_create(self, value, name)
482 def _create(self, value, name=None):
483 name = self._next_var_name() if name is None else name
--> 484 self.set(name, value)
485 return name
486
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in set(self,
var, value)
1412 """
1413 cmd = ('%s:=%s;;' % (var, value)).replace('\n','')
-> 1414 self._eval_line(cmd, allow_use_file=True)
1415
1416 def get(self, var, use_file=False):
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
741 try:
742 if self._expect is None:
--> 743 self._start()
744 E = self._expect
745 #import pdb; pdb.set_trace()
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_start(self)
1245 os.utime(WORKSPACE, None)
1246 except OSError:
-> 1247 gap_reset_workspace(verbose=False)
1248
1249 global first_try
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
gap_reset_workspace(max_workspace_size, verbose)
1577 # Create new workspace with filename WORKSPACE
1578 g = Gap(use_workspace_cache=False, max_workspace_size=None)
-> 1579 g.eval('SetUserPreference("HistoryMaxLines", 30)')
1580 from sage.tests.gap_packages import all_installed_packages
1581 for pkg in all_installed_packages():
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
eval(self, x, newlines, strip, split_lines, **kwds)
581 if not input_line.endswith(';'):
582 input_line += ';'
--> 583 result = Expect.eval(self, input_line, **kwds)
584 if not newlines:
585 result = result.replace("\\\n","")
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
eval(self, code, strip, synchronize, locals, allow_use_file, split_lines,
**kwds)
1349 elif split_lines:
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
1353 return self._eval_line(code,
allow_use_file=allow_use_file, **kwds)
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
<listcomp>(.0)
1349 elif split_lines:
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
1353 return self._eval_line(code,
allow_use_file=allow_use_file, **kwds)
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
741 try:
742 if self._expect is None:
--> 743 self._start()
744 E = self._expect
745 #import pdb; pdb.set_trace()
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_start(self)
1272
1273 # set random seed
-> 1274 self.set_seed(self._seed)
1275
1276 def _function_class(self):
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
set_seed(self, seed)
1177 if seed is None:
1178 seed = self.rand_seed()
-> 1179 self.eval("Reset(GlobalMersenneTwister,%d)" % seed)
1180 self.eval("Reset(GlobalRandomSource,%d)" % seed)
1181 self._seed = seed
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
eval(self, x, newlines, strip, split_lines, **kwds)
581 if not input_line.endswith(';'):
582 input_line += ';'
--> 583 result = Expect.eval(self, input_line, **kwds)
584 if not newlines:
585 result = result.replace("\\\n","")
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
eval(self, code, strip, synchronize, locals, allow_use_file, split_lines,
**kwds)
1349 elif split_lines:
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
1353 return self._eval_line(code,
allow_use_file=allow_use_file, **kwds)
/sage/local/lib/python3.6/site-packages/sage/interfaces/expect.py in
<listcomp>(.0)
1349 elif split_lines:
1350 return '\n'.join([self._eval_line(L,
allow_use_file=allow_use_file, **kwds)
-> 1351 for L in code.split('\n')
if L != ''])
1352 else:
1353 return self._eval_line(code,
allow_use_file=allow_use_file, **kwds)
/sage/local/lib/python3.6/site-packages/sage/interfaces/gap.py in
_eval_line(self, line, allow_use_file, wait_for_prompt, restart_if_needed)
753 # garbage should be filtered out by this point); here
we decode
754 # them (on Python 3), currently just using the default
encoding
--> 755 normal, error = bytes_to_str(normal),
bytes_to_str(error)
756
757 if len(error):
/sage/local/lib/python3.6/site-packages/sage/cpython/string.pxd in
sage.cpython.string.bytes_to_str
(build/cythonized/sage/cpython/string.c:1509)()
29
30
---> 31 cpdef inline str bytes_to_str(b, encoding=None, errors=None):
32 r"""
33 Convert ``bytes`` to ``str``.
/sage/local/lib/python3.6/site-packages/sage/cpython/string.pxd in
sage.cpython.string.bytes_to_str
(build/cythonized/sage/cpython/string.c:1393)()
58 return <str>b
59 else:
---> 60 return _cstr_to_str(<bytes>b, encoding, errors)
61
62
TypeError: ('utf-8', b'[ <...snipped...>\ngap> ', 15, 16, 'invalid start
byte')
Possibly this is related to (or a subset of)
https://trac.sagemath.org/ticket/26992
though the command "libgap('0')" has no problems. Is the plan to make
"gap" and alias of (or a wrapper for) "libgap" in future releases?
Thanks,
Nathan
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