I'm trying to subclass the StrPrinter and PrettyPrinter so that I can
customize the display of some classes I have created for PyDy. I have
had success with getting StrPrinter, but I found it to have some weird
unicode issues, so I am using plain old strings for my sublcass of
StrPrinter, and would like to reserve all unicode stuff for the
PrettyPrinter.
The way I am subclassing StrPrinter is as follows:
1) My PyDy classes are subclassed from Basic. I override the __str__()
method of each of my PyDy classes to look like:
def __str__(self):
return pydy_str(self)
where pydy_str(self) looks like:
def pydy_str(e):
p = PyDyStrPrinter()
return p.doprint(e)
2) I subclass StrPrinter, and add methods entitled
_print_<MyPyDyClass>, as follows:
def _print_UnitVector(self, e):
....
These _print_*** methods return a string of how I want each class to
be displayed.
Nowhere in any of my classes, or in my subclassing of StrPrinter, do I
have printmethod defined. Everything above works just fine.
The problem is when I try the same approach with subclassing
PrettyPrinter. I created class methods entitled _sympypretty_() for
each of my classes, then define a pydy_pretty() function, and then
subclass PrettyPrinter, analogously to my approach above. It doesn't
work. Specifically, I get infinite recursion runtime errors. I tried
adding the printmethod class attribute to my PyDyPrettyPrinter, but it
didn't make any difference, I still get infinite recursion errors.
I have spent many hours on this and I am sure it is probably a very
simple fix and that I am just not using things correctly. Does
anybody have any recommendations on how this should be done properly?
Ideally, some example code would be the best that way there would be
no confusion as to how this should be done.
It seems to me that the approach that should be taken to subclassing
either StrPrinter or PrettyPrinter should be conceptually the same,
but perhaps this isn't the case?
Also, is the approach I am using above for customizing the StrPrinter
the recommended way to do it?
Thanks,
~Luke
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