How to pretty print in ipython notebook via sympy?

Question

I tried pprint, print, the former only prints Unicode version, and the latter doesn't do pretty prints.

from sympy import symbols, Function
import sympy.functions as sym
from sympy import init_printing
init_printing(use_latex=True)
from sympy import pprint
from sympy import Symbol

x = Symbol('x')

# If a cell contains only the following, it will render perfectly.
(pi + x)**2

# However I would like to control what to print in a function, 
# so that multiple expressions can be printed from a single notebook cell.
pprint((pi + x)**2)

Answer 1

you need to use display:

from IPython.display import display

display(yourobject)

It will choose the appropriate representation (text/LaTex/png...), in recent enough version of IPython (6.0+) display is imported by default, still we recommend to explicitly import it.

Answer 2

The issue is with your init_printing statement. In a notebook, you do not want to run latex, instead you should use mathjax, so try this instead:

init_printing(use_latex='mathjax')

When I use this, I get normal pretty printing everywhere, even when I have a sympy expression as the last line of the cell.

Answer 3

This works,

from IPython.display import display, Latex
from sympy import *

x = symbols('x')
display(x)

int_x = Integral(cos(x)*exp(x), x)
result = "$${} = {}$$".format(latex(int_x), latex(int_x.doit()))
display(Latex(result))

derv_x = Derivative(cos(x)*exp(x), x)
result = "$${} = {}$$".format(latex(derv_x), latex(derv_x.doit()))
display(Latex(result))

try it for yourself.