python plotly: box plot using column in dataframe

Question

I am enjoying using plotly and wanted to plot boxplots for my data.

From their website, I do the following:

import plotly.plotly as py
import plotly.graph_objs as go

import numpy as np

y0 = np.random.randn(50)
y1 = np.random.randn(50)+1

trace0 = go.Box(
    y=y0,
    name = 'Sample A',
    marker = dict(
        color = 'rgb(214, 12, 140)',
    )
)
trace1 = go.Box(
    y=y1,
    name = 'Sample B',
    marker = dict(
        color = 'rgb(0, 128, 128)',
    )
)
data = [trace0, trace1]
py.iplot(data)

The challenge that I have is that I do not know the total number of "trace" is unknown. For example:

titanic = pd.read_csv("http://biostat.mc.vanderbilt.edu/wiki/pub/Main/DataSets/titanic3.csv")

I would like to plot a boxplot, by column 'embarked', a boxplot of the 'fare' column. Since the total number of unique values in 'embarked' is unknown, I do not want to hardcode that in.

Does anyone know how I can do this properly in plotly?

Thank you!

Maximilian Peters · Accepted Answer · 2017-09-06 17:41:16Z

2

You could loop over your unique values in embarked and add a trace for each one. In this case there is also nan which needs separate treatment.

for embarked in titanic.embarked.unique():

import plotly
plotly.offline.init_notebook_mode()
import pandas as pd
import numpy as np

titanic = pd.read_csv("http://biostat.mc.vanderbilt.edu/wiki/pub/Main/DataSets/titanic3.csv")

traces = list()
for embarked in titanic.embarked.unique():
    if str(embarked) == 'nan':
       traces.append(plotly.graph_objs.Box(y=titanic[pd.isnull(titanic.embarked)].fare,
                                            name = str(embarked)
                                            )
                     )
    else:
        traces.append(plotly.graph_objs.Box(y=titanic[titanic.embarked == embarked].fare,
                                            name = embarked
                                            )
                     )
plotly.offline.iplot(traces)

answered Sep 6, 2017 at 17:41

Maximilian Peters

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5 Comments

Trexion Kameha Over a year ago

Thank you. I am not seeing anything being displayed as it comes back blank. FYI I am in jupyter notebook.

Maximilian Peters Over a year ago

Weird. I was also using a Jupyter Notebook and just tried it with a fresh notebook.

Trexion Kameha Over a year ago

Why do the offline thing? I read the documentation, but it really only focuses on what happens and it why it's better. Does it take up less ram?

Maximilian Peters Over a year ago

I think on the client side it does not matter, I just usually don't need to upload my plots or share them, that's why I use offline.

Trexion Kameha Over a year ago

OK got it so it doesn't load anything online and I don't have to deal with the privacy settings.

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