|
Size: 1113
Comment:
|
← Revision 5 as of 2018-07-25 19:48:22 ⇥
Size: 0
Comment: useless and disturbing
|
| Deletions are marked like this. | Additions are marked like this. |
| Line 1: | Line 1: |
| For work on the python3-compatible version of sage, see [[Python3-compatible code]] == matplotlib's experiences porting to Python 3 == * Drop support for < 2.6 (master currently supports 2.4) * Easy things (that 2to3 handles pretty well): * print function * "in" vs. "has_key" * "except Exception as exc" syntax * stdlib stuff * 2to3 is slooooow * Unicode * Unicode literals by default * no implicit conversion between Unicode and bytes (encoding must be explicit) * files must have explicit Unicode encoding, or be binary -- hard to do both at same time * Exceptions {{{ exceptions_found = [] try: do_something() except Exception as e: exceptions_found.append(e) }}} Since e now has a __traceback__ member, this creates a cycle e -> traceback -> current stack frame -> e. This cycle will keep alive all local variables in all frames beneath the source of the exception. * C/C++ issues * For us, mostly hidden by using CXX * PyCObject was dropped in Python 3.2 -- had to port CXX to use its replacement PyCapsule |
