I tryed the same expressions on sympy online and it worked, so I don't
think it is a specific expressions issue, but I can be wrong of course.
Online I tryed without sympify 'cause I wanted to try if it was just a
specific error as you said.
I post my code if it can help:
#!/usr/bin/env python
from sympy import Symbol, sympify
from sympy import *
from mpmath import *
from sympy.solvers import linsolve
import re
var = {"m1": 1, "m2": 2, "v1i": 3, "v1f": 4, "v2i": '', "v2f": ''}
c = 0
unk = []
x, y = 0, 0
for key, val in var.items():
if val == '':
c+=1
if x==0:
x = key
unk.append(x)
x = symbols(key, real=True)
elif y==0:
y=key
unk.append(y)
y = symbols(key, real=True)
else:
break
if c>2:
print("Mi spiace non posso calcolare i dati mancanti. Contatta
l'amministratore se sei sicuro dei dati inseriti!")
else:
system = ["m1 * v1i + m2 * v2i - m1 * v1f - m2 * v2f",
"m1 * v1i * v1i / 2 + m2 * v2i * v2i / 2 - m1 * v1f * v1f / 2 -
m2 * v2f * v2f / 2"]
for key, val in var.items():
if not val == '':
for i in range(len(system)):
system[i] = system[i].replace(key, str(val))
print(system)
eq = sympify(system)
system = nonlinsolve(eq, [x, y])
print(system)
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