Description of problem: This is an example from "Doing Math with Python", published by no starch press, chap 4. Version-Release number of selected component (if applicable): sympy 1.6 ? How reproducible: 100% Steps to Reproduce: idle session: Python 3.8.3 (default, May 15 2020, 00:00:00) [GCC 10.1.1 20200507 (Red Hat 10.1.1-1)] on linux Type "help", "copyright", "credits" or "license()" for more information. >>> from sympy import symbol >>> from sympy import Symbol >>> x = Symbol( 'x') >>> y = Symbol( 'y') >>> expr = 1 + 2*x + 2*x**2 >>> expr 2*x**2 + 2*x + 1 >>> from sympy import pprint >>> expr 2*x**2 + 2*x + 1 >>> pprint( expr) 2 2⋅x + 2⋅x + 1 >>> from sympy import init_printing >>> init_printing( order='rev-lex') >>> pprint(expr) 2 2⋅x + 2⋅x + 1 >>> init_printing() >>> init_printing( order='rev-lex') >>> pprint(expr) 2 2⋅x + 2⋅x + 1 >>> Expected results: 2 expr should pprint as 1 + 2⋅x + 2⋅x in reverse lexicographic order Additional info: Ubuntu 20.04 produces expected result, but I am not sure about sympy version
This may be a change in sympy 1.6, as I do not see rev-lex mentioned in the documentation for init_printing(): https://docs.sympy.org/latest/modules/interactive.html On the other hand, this works: >>> pprint(expr, order='rev-lex') 2 1 + 2⋅x + 2⋅x
Thank you, I can proceed with the textbook, using order='rev-lex' as an argument to pprint. Just more typing.
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