"""
======================
Plotting with keywords
======================

There are some instances where you have data in a format that lets you
access particular variables with strings: for example, with
`numpy.recarray` or `pandas.DataFrame`.

Matplotlib allows you provide such an object with the ``data`` keyword
argument. If provided, then you may generate plots with the strings
corresponding to these variables.
"""

import numpy as np
import matplotlib.pyplot as plt
np.random.seed(19680801)

data = {'a': np.arange(50),
        'c': np.random.randint(0, 50, 50),
        'd': np.random.randn(50)}
data['b'] = data['a'] + 10 * np.random.randn(50)
data['d'] = np.abs(data['d']) * 100

fig, ax = plt.subplots()
ax.scatter('a', 'b', c='c', s='d', data=data)
ax.set(xlabel='entry a', ylabel='entry b')
plt.show()