On 02.06.2012 10:24, Sergiu Ivanov wrote:
Hello,
I am trying to create custom pretty-printing behaviour for my class
Morphism. What would be the canonical example for that? I've found
[0], which says that I could do that by defining a method
_print_Morphism in one of the pretty printers. However, I have also
seen what I believe is connected to pretty printing in
sympy.physics.quantum.gate.Gate for instance, the methods _sympystr(),
_pretty(), _latex(). Is defining such methods the proper way to go
today? Also, what would be the difference between defining
_sympystr() and str()? I can see that Gate does not define str() at
all.
I know nothing about printing in the quantum module, but in those parts
of sympy I do know, the canonical way to pretty print stuff is to write
_print_Foo methods for the printers (most likely latex and pretty). Just
look at the files sympy/printing/latex.py and
sympy/printing/pretty/pretty.py and search for e.g. _print_Matrix,
_print_meijerg, etc.
And yet another question refers to testing. I can see that there are
a lot of tests referring to built-in SymPy primitives in
sympy/printing/pretty/tests/test_pretty.py; also, there are a couple
pretty-printing related tests in other modules. However, I cannot see
pretty printing being tested in sympy.physics.quantum. So, is it
going to be okay if I test the pretty printing of Morphism in the
tests of category theory module, or should I put the tests in a
different place?
Apparently, all printing tests should go directly into the printing/
directory. [Not entirely sure why.]
Sergiu
[0] http://docs.sympy.org/dev/modules/printing.html
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