Update app.py

app.py

@@ -25,7 +25,7 @@ max_year = int(taraf_s['Year'].max())
 def plot_timeline(yaxis, citi = ['المدينه', 'بغداد', 'كوفة', 'بصرة'], min_year = 0, max_year = 400):
     if min_year >= max_year:
         raise gr.error('Min Year Cannot be Bigger than Max Year!')
-    if citi = ['All']:
+    if citi == ['All']:
         filtered = taraf_s.copy()[(taraf_s['Year'] >= min_year) & (taraf_s['Year'] <= max_year)].groupby(['Year']).sum()
         fig = px.line(data_frame = filtered, x = 'Year', y = yaxis, title = f"{yaxis} per Year", color = 'City', template = 'plotly_dark' )
     else: