Aaron Meurer edited this page Mar 12, 2011 · 2 revisions
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To start sympy in debug mode set the SYMPY_DEBUG variable. For instance in a unix-like system you would do

$ SYMPY_DEBUG=true bin/isympy

or in Windows

> set SYMPY_DEBUG=true
> python bin/isympy

Now just use for example the limit() function. You will get a nice printed tree, which is very useful for debugging.