python/plotly/plotly.express.line\343\201\247\347\267\232\343\201\256\345\244\252\343\201\225\343\202\222\345\244\211\343\201\210\343\202\213.md
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+[Change linewidth in python plotly px figure - Stack Overflow](https://stackoverflow.com/questions/62922491/change-linewidth-in-python-plotly-px-figure)
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+
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+`fig.update_traces`を使う。
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+
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+```
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+import plotly.express as px
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+
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+df = px.data.gapminder().query("continent=='Oceania'")
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+fig = px.line(df, x="year", y="lifeExp", color='country')
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+
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+# This styles the line
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+fig.update_traces(line=dict(color="Black", width=0.5))
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+
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+fig.show()
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+```
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