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Update doc/python/px-arguments.md

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`@@ -132,6 +132,7 @@ PySpark dataframes are also supported and are converted to pandas dataframes int`
`132`	`132`	- Plotly Express requires NumPy. You can install it with `pip install numpy` if it's not installed by the dataframe library you are using.
`133`	`133`	`- To use [trendlines](/python/linear-fits/), you'll also need to have pandas installed.`
`134`	`134`	`- To use PySpark dataframes, you'll need to have pandas installed. To use dataframes that support the dataframe interchange protocol, you'll need to have PyArrow installed.`
	`135`	`+`
`135`	`136`	### Example: Using a Pandas DataFrame with `px.bar`
`136`	`137`
`137`	`138`	Here, we create a pandas `DataFrame`, pass it to `px.bar` as its first argument, and then use the `"sepal_length"` column for the x-axis and the `"sepal_width"` for the y-axis.

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