SymPy equivalent to HoldForm in mathematica

问题

In Mathematica, it is possible to prevent the system from simplifying expressions when they are entered. The syntax is as follows:

HoldForm[x/x]

Is it possible to do something similar with SymPy?

回答1:

The following approaches achieve a similar effect. There might be others available I am not aware of.

import sympy as sp

x = sp.symbols('x')

expr1 = x/x 
expr2 = sp.S('x/x', evaluate=False)
expr3 = sp.Mul(x, 1/x, evaluate=False)

print(expr1)
print(expr2)
print(expr3)

1
x/x
x/x

回答2:

You can also use with evaluate(False), like

with evaluate(False):
     print(x/x)

来源：https://stackoverflow.com/questions/40264977/sympy-equivalent-to-holdform-in-mathematica