Bokeh: Quick Start

Sumber: http://bokeh.pydata.org/en/latest/docs/quickstart.html

Instalasi

Jika kita menggunakan Anaconda, kita dapat menggunakan

conda install bokeh

Ini akan menginstalasi secara lengkap, tanpa pusing.

Jika kita cukup Percaya Diri (PD) bahwa kita mempunyai semua dependensi yang dibutuhkan seperti NumPy, Pandas, dan Redis, maka kita dapat menggunakan,

pip install bokeh

Getting Started

Bokeh is a large library that exposes many capabilities, so this section is only a quick tour of some common Bokeh use-cases and workflows. For more detailed information please consult the full User Guide.

Let’s begin with some examples.

Plotting some data in basic Python lists as a line chart including zoom, pan, resize, save, and other tools is simple and straightforward:

from bokeh.plotting import figure, output_file, show

# prepare some data
x = [1, 2, 3, 4, 5]
y = [6, 7, 2, 4, 5]

# output to static HTML file
output_file("lines.html", title="line plot example")

# create a new plot with a title and axis labels
p = figure(title="simple line example", x_axis_label='x', y_axis_label='y')

# add a line renderer with legend and line thickness
p.line(x, y, legend="Temp.", line_width=2)

# show the results
show(p)

When you execute this script, you will see that a new output file "lines.html" is created, and that a browser automaticaly opens a new tab to display it. (For presentation purposes we have included the plot output directly inline in this document.)

The basic steps to creating plots with the bokeh.plotting interface are:

• Prepare some data (in this case plain python lists).
• Tell Bokeh where to generate output (in this case using output_file(), with "lines.html" as the filename to save as).
• Call figure() to create a plot with some overall options like title, tools and axes labels.
• Add renderers (in this case, Figure.line) for our data, with visual customizations like colors, legends and widths to the plot.
• Ask Bokeh to show() or save() the results.

Steps three and four can be repeated to create more than one plot. See some examples of this below.

The bokeh.plotting interface is also quite handy if we need to customize the output a bit more by adding more data series, glyphs, logarithmic axis, etc. It’s also possible to easily combine multiple glyphs together on one plot as shown below:

from bokeh.plotting import figure, output_file, show

# prepare some data
x = [0.1, 0.5, 1.0, 1.5, 2.0, 2.5, 3.0]
y0 = [i**2 for i in x]
y1 = [10**i for i in x]
y2 = [10**(i**2) for i in x]

# output to static HTML file
output_file("log_lines.html")

# create a new plot
p = figure(
   tools="pan,box_zoom,reset,save",
   y_axis_type="log", y_range=[0.001, 10**11], title="log axis example",
   x_axis_label='sections', y_axis_label='particles'
)

# add some renderers
p.line(x, x, legend="y=x")
p.circle(x, x, legend="y=x", fill_color="white", size=8)
p.line(x, y0, legend="y=x^2", line_width=3)
p.line(x, y1, legend="y=10^x", line_color="red")
p.circle(x, y1, legend="y=10^x", fill_color="red", line_color="red", size=6)
p.line(x, y2, legend="y=10^x^2", line_color="orange", line_dash="4 4")

# show the results
show(p)

Jupyter Notebooks

At this point we should mention Jupyter (formerly IPython) notebooks.

Jupyter notebooks are a fantastic tool for exploratory data analysis, and they are widely used across the “PyData” community. Bokeh integrates seamlessly with Jupyter notebooks. To view the above examples in a notebook, you would only change output_file() to a call to output_notebook() instead.

A large number of static examples may be viewed directly online at the Bokeh NBViewer Gallery.

The Bokeh GitHub repository also has a number of example notebooks in the examples/plotting/notebook/ directory. After cloning the repository, navigate there and run:

ipython notebook

You can open and interact with any of the notebooks listed in the index page that automatically opens up. In particular, you might check out the interact_basic and interact_numba examples that show how Bokeh can be used together with Jupyter interactive widgets.

Referensi

• http://bokeh.pydata.org/en/latest/docs/quickstart.html