Python 3 does not show the barchart

Question

I am trying to make this bargraph appear in the python run screen. But for some reason, it does not show the graph on the screen. However, if I put this code on the google online coding website, it shows the bar graph fine. Can anyone let me know what the problem is?

import pandas as pd
import plotly.express as px

df = pd.read_csv("Diversity2.csv")
df = df.groupby(['School','White'], as_index=False)[['School']].sum()
# df = df.groupby(['School','White']).sum().plot(kind='bar')

df['White']=df['White'].astype(float)

# df.plot(kind='bar', x='School', y='White', figsize=(20,10))
barchart = px.bar(
    data_frame=df,
    x="School",
    y="White",
    color="School",
    opacity=0.9,
    orientation="v",
    barmode='overlay')


barchart.show()