Partial Fraction Solver(not operational)

import ipywidgets as widgets
from IPython.display import display, clear_output
import sympy as sp
from sympy.parsing.sympy_parser import parse_expr
from sympy import init_session
init_session(quiet=True)
sp.init_printing()

x = sp.symbols("x")
text = ["Numerator", "Denominator"]
box_layout = widgets.Layout(display="flex",
                            flex_flow="row",
                            align_items="stretch",
                            width="100%")

goBtn = widgets.Button(description="Run",
                      layout=widgets.Layout(width="10%"))
quitBtn = widgets.Button(description="Quit",
                        layout=widgets.Layout(width="10%"))
numerator = widgets.Text(
            value = "",
            placeholder = text[0] + " goes here.",
            description = text[0] + " :",
            disabled = False,
            layout=widgets.Layout(width="40%"))
denominator = widgets.Text(
            value = "",
            placeholder = text[1] + " goes here.",
            description = text[1] + " :",
            disabled = False,
            layout=widgets.Layout(width="40%"))
out = widgets.Output(layout=widgets.Layout(left="30%", border="1px solid blue", width="40%"))

def errMsg(message):
    clear_output()
    out.clear_output()
    with out:
        print(message)
    display(out)
    setUp()
    
def go_button_clicked(b):
    fx = ""
    gx = ""
    partialFraction = ""
    try:
        fx = parse_expr(numerator.value)   
        gx = parse_expr(denominator.value)
    except:
        errMsg("Input Error - x^2=x**2, 2x=2*x, polynomials only")
            
    if gx != "" and fx != "":
        denomFactored = sp.factor(gx)   
        try:    
            partialFraction = sp.apart(fx/gx)
        except:
            errMsg("Polynomials only, no division by zero either!")
        
    if partialFraction != "":
        with out:
            display(sp.Eq(fx/gx, partialFraction))
        display(out)
        
def quitProgram(b):
    quitBtn.close()
    numerator.close()
    denominator.close()
    goBtn.close()
    clear_output()
    
def setUp():
    items = [numerator, denominator, goBtn, quitBtn]
    display(widgets.Box(children=items, layout=box_layout))
    goBtn.on_click(go_button_clicked)
    quitBtn.on_click(quitProgram)
    
setUp()