How to fix exe generated from a tkinter example code? - python-3.x

Question

I have used pyinstaller to generate exe from this tkinter gui example. But the generated exe in the dist folder does not show any gui. Is it because of the file reading operation? I have followed some examples. But the problem is still there.
from tkinter import *
import pandas as pd
import statsmodels.api as sm
class Checkbar(Frame):
def __init__(self, parent=None, picks=[], side=LEFT, anchor=W):
Frame.__init__(self, parent)
self.vars = []
for pick in picks:
var = IntVar()
chk = Checkbutton(self, text=pick, variable=var)
chk.pack(side=side, anchor=anchor, expand=YES)
self.vars.append(var)
def state(self):
return map((lambda var: var.get()), self.vars)
if __name__ == '__main__':
dfs = pd.read_excel("data.xlsx")
root = Tk()
root.title("Ship Repairing Time")
root.geometry("800x600+0+0")
heading = Label(root, text="Choose the variables you want", font=("arial", 25, "bold"), fg="blue").pack()
lng = Checkbar(root, ['PLATE', 'SB', 'HC', 'GRT', 'D', 'TC', 'V', 'PA'])
include = Checkbutton(root, )
lng.pack(side=TOP, fill=X)
T = Text(root, height=25, width=90)
T.pack()
selected_columns = []
x = dfs.iloc[:, 1:]
print(list(x))
y = dfs["T"]
#tgl.pack(side=LEFT)
lng.config(relief=GROOVE, bd=2)
def allstates():
T.delete(1.0,END)
print(list(lng.state()))
for i in range(len(list(lng.state()))):
if list(lng.state())[i] == 1:
selected_columns.append(list(x)[i])
print(selected_columns)
selected_frame = x[selected_columns]
selected_frame = sm.add_constant(selected_frame)
model = sm.OLS(y, selected_frame).fit()
predictions = model.predict(selected_frame)
T.insert(END, model.summary())
selected_columns.clear()
Button(root, text='Quit', command=root.quit).pack(side=BOTTOM)
Button(root, text='Calculate', command=allstates).pack(side=TOP)
root.mainloop()