[Python] estimation Internet Speed test app in flet

i have completly followed to the following link :youtube tutorial for speed test

and also given link : github page

and there is my code :

import flet as ft
from flet import *
from time import sleep
import speedtest
def main(page:ft.Page):
page.title ="Internet Speed Test"
page.theme_mode ="dark"
page.vertical_alignment ="center"
page.horizontal_alignment ="center"
page.window.bgcolor ="blue"
page.padding =30
page.bgcolor ="black"
page.auto_scroll =True
page.fonts={
"RoosterPersonalUse":"fonts/RoosterPersonalUse-3z8d8.ttf",
"SourceCodePro-BlackItalic":"fonts/SourceCodePro-BlackItalic.ttf",
"SourceCodePro-Bold" :"fonts/SourceCodePro-Bold.ttf"
}
st =speedtest.Speedtest(secure=True)
appTitle =ft.Row(
controls=[
ft.Text(value="Internet",font_family="RoosterPersonalUse",
style=ft.TextThemeStyle(value="displayLarge"),color="#ff3300"),
ft.Text(value ="Speed",font_family="SourceCodePro-BlackItalic",
style=ft.TextThemeStyle(value="displayLarge"),color="#ffff00")
],alignment=ft.MainAxisAlignment(value="center")
)
line_01 = ft.Text(value="> press start...", font_family="SourceCodePro-BlackItalic", color="#ffffff")
line_02 = ft.Text(value="", font_family="SourceCodePro-BlackItalic", color="#1aff1a")
line_03 = ft.Text(value="", font_family="SourceCodePro-BlackItalic", color="#1aff1a")
line_04 = ft.Text(value="", font_family="SourceCodePro-BlackItalic", color="#ffff00")
line_05 = ft.Text(value="", font_family="SourceCodePro-BlackItalic", color="#1aff1a")
line_06 = ft.Text(value="", font_family="SourceCodePro-BlackItalic", color="#1aff1a")
line_07 = ft.Text(value="", font_family="SourceCodePro-BlackItalic",color="#ffff00")
line_08 = ft.Text(value="", font_family="SourceCodePro-BlackItalic", color="#ffffff")
progress_bar_01 =ft.ProgressBar(width=400,color="#0080ff", bgcolor="#eeeeee", opacity=0)
progress_text_01 = ft.Text(" ", font_family="SourceCodePro-BlackItalic", color="#1aff1a",
)
progress_row_01 = ft.Row([progress_text_01, progress_bar_01])
progress_bar_02 = ft.ProgressBar(width=400, color="#0080ff", bgcolor="#eeeeee", opacity=0)
progress_text_02 = ft.Text(" ", font_family="SourceCodePro-BlackItalic", color="#1aff1a",
)
progress_row_02 = ft.Row([progress_text_02, progress_bar_02])
terminalText = ft.Column(
[line_01, line_02, line_03, progress_row_01, line_04, line_05, line_06, progress_row_02, line_07, line_08])




getSpeedContainer =ft.Container(
content=terminalText,
width=200,
height=100,
bgcolor="#4d4d4d",
border_radius=30,
padding=20,
animate=ft.Animation(duration=1000,curve=ft.AnimationCurve(value="bounceOut"))


)
def animate_getSpeedContainer(e):
getSpeedContainer.update()
progress_row_01.opacity = 0
progress_bar_01.opacity = 0
progress_bar_01.value = None
progress_row_02.opacity = 0
progress_bar_02.opacity = 0
progress_bar_02.value = None
line_01.text_to_print = ""
line_01.update()
line_02.text_to_print = ""
line_02.update()
line_03.text_to_print = ""
line_03.update()
line_04.text_to_print = ""
line_04.update()
line_05.text_to_print = ""
line_05.update()
line_06.text_to_print = ""
line_06.update()
line_07.text_to_print = ""
line_07.update()
line_08.text_to_print = ""
line_08.update()
getSpeedContainer.width =700
getSpeedContainer.height =400
getSpeedContainer.update()
getSpeedContainer.update()
getSpeedContainer.width = 700
getSpeedContainer.height = 400
line_01.text_to_print = "> calculating download speed, please wait..."
getSpeedContainer.update()
sleep(1)
line_01.update()
ideal_server = st.get_best_server() # this will find out and connect to the best possible server
city = ideal_server["name"] # for getting the city name
country = ideal_server["country"] # for getting the country name
cc = ideal_server["cc"] # for getting the country code
line_02.text_to_print = f"> finding the best possible servers in {city}, {country} ({cc})"
line_02.update()
getSpeedContainer.update()
sleep(1)
line_03.text_to_print = "> connection established, status OK, fetching download speed"
line_03.update()
progress_row_01.opacity = 1
progress_bar_01.opacity = 1
getSpeedContainer.update()
download_speed = st.download() / 1024 / 1024 # bytes/sec to Mbps
progress_bar_01.value = 1
line_04.text_to_print = f"> the download speed is {str(round(download_speed, 2))} Mbps"
line_04.update()
getSpeedContainer.update()
line_05.text_to_print = "> calculating upload speed, please wait..."
line_05.update()
getSpeedContainer.update()
sleep(1)
line_06.text_to_print = "> executing upload script, hold on"
line_06.update()
progress_row_02.opacity = 1
progress_bar_02.opacity = 1
getSpeedContainer.update()
upload_speed = st.upload() / 1024 / 1024 # bytes/sec to Mbps
progress_bar_02.value = 1
line_07.text_to_print = f"> the upload speed is {str(round(upload_speed, 2))} Mbps"
line_07.update()
getSpeedContainer.update()
sleep(1)
line_08.text_to_print = f"> task completed successfully\n\n>> app developer: kumar anurag (instagram: kmranrg)"
line_08.update()
getSpeedContainer.update()

page.add(
appTitle,
getSpeedContainer,
ft.IconButton(icon=ft.Icons.PLAY_CIRCLE_FILL_OUTLINED,icon_color="green",icon_size=70,
on_click=animate_getSpeedContainer),

)

ft.app(target=main,assets_dir="assets")


result of this code is given as :

as you can see texts are not displayed and also reseults of speeds are not calculated, could you tell me please reason for it? thanks in advance

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