dash problems

[zhujp98]

I want to scatter plot campcnt vs cnt by year, but I get error msg. How to fix this problem?
Thanks,
Jeff

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print(df.head())     app = dash.Dash() app.layout = html.Div([     dcc.Graph(         id='life-exp-vs-gdp',         figure={             'data': [                 go.Scatter(                     x=df[df['year'] == i]['cntcamp'],                     y=df[df['year'] == i]['cnt'],                     mode='markers',                     opacity=0.7,                     marker={                         'size': 15,                         'line': {'width': 0.5, 'color': 'white'}                     },                     name=i                 ) for i in df.year.unique()             ],             'layout': go.Layout(                 xaxis={'type': 'log', 'title': 'Camp Count'},                 yaxis={'title': 'Total count'},                 margin={'l': 40, 'b': 40, 't': 10, 'r': 10},                 legend={'x': 0, 'y': 1},                 hovermode='closest'             )         }     ) ])

Output:
   year  cntcamp        cnt
0  2015       36  347318781
1  2017      100  115586825
2  2016       48   59420381
3  2018       49   12924098
4  2014        6    2052933

Error:
Traceback (most recent call last):

  File "<ipython-input-8-ddb45a8148ad>", line 20, in <module>
    ) for i in df.year.unique()

AttributeError: 'SASdata' object has no attribute 'year'