FormatterWarning when to use sympy.Abs in IPython notebook

[chaowen guo]

I run the following code in IPython notebook

import sympy
sympy.init_printing()
x=sympy.symbols("x",real=True)
sympy.Abs(x)

and always get the following warning:

/usr/lib/python3/dist-packages/IPython/core/formatters.py:239: FormatterWarning: Exception in image/png formatter: 
\left\lvert{x}\right\rvert
     ^
Expected a delimiter (at char 5), (line:1, col:6)
  FormatterWarning,

Although the answer is correct, my program has a lot of formula with sympy.Abs. So it prints a lot of warning messages like the above one. It is pretty annoying.

How to fix the problem?

Chaowen GUO

[Jason Moore]

Chaowen,

This has been fixed, see https://github.com/sympy/sympy/issues/2822.

If you upgrade to SymPy 0.7.6, you shouldn't get the warning anymore.

Jason
moorepants.info
+01 530-601-9791

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[Aaron Meurer]

I don't remember fixing abs(). As far as I know, it wasn't fixed.
latex(abs(x)) still gives a result using \lvert.

We should probably just use \left \| instead of \lvert. Any reason to
use the latter?

Aaron Meurer

> https://groups.google.com/d/msgid/sympy/CAP7f1AixSCrF7hO0kypYXm0_SzTdvPS4yn4Ss_%2BAWbCwWQCZ5w%40mail.gmail.com.

[chaowen guo]

No, I already use 0.7.6. The problem remains.

[Aaron Meurer]

I opened https://github.com/sympy/sympy/issues/8984 for it. It's a
good easy to fix issue if someone is looking for one.

Aaron Meurer

> https://groups.google.com/d/msgid/sympy/1da9d427-1b52-41f1-a7c1-1b75b48d4b03%40googlegroups.com.