top_platforms = games.platform.value_counts().sort_values(ascending = False).head(5).index.values
top_platform_sales = top_platforms.groupby('year_of_release')[['total_sales']].sum()

trace0 = go.Scatter(
    x=top_platform_sales.index,
    y=top_platform_sales.total_sales,
    name='PS2'
)

trace1 = go.Scatter(
    x=top_platform_sales.index,
    y=top_platform_sales.total_sales,
    name='X360'
)

trace2 = go.Scatter(
    x=top_platform_sales.index,
    y=top_platform_sales.total_sales,
    name='PS3'
)

trace3 = go.Scatter(
    x=top_platform_sales.index,
    y=top_platform_sales.total_sales,
    name='Wii'
)

trace4 = go.Scatter(
    x=top_platform_sales.index,
    y=top_platform_sales.total_sales,
    name='DS'
)

data = [trace0, trace1, trace2, trace3, trace4]
layout = {'title': 'Распределение продаж платформ по годам'}

fig = go.Figure(data=data, layout=layout)
iplot(fig, show_link=False)

AttributeError                            Traceback (most recent call last)
<ipython-input-80-384ce6b35709> in <module>
----> 1 top_platform_sales = top_platforms.groupby('year_of_release')[['total_sales']].sum()
      2
      3 trace0 = go.Scatter(
      4     x=top_platform_sales.index,
      5     y=top_platform_sales.total_sales,

AttributeError: 'numpy.ndarray' object has no attribute 'groupby'