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← Revision 5 as of 2018-07-25 19:48:22 ⇥
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| matplotlib's experiences porting to Python 3. * 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 |
