plt.style() in matplotlib causes error

[leecreighton]

I'm doing some of the projects from Python Crash Course 2nd Ed., as I'm new to the language.

A simple point plotter throws an error when plt.style() is called. Here's the code:

import matplotlib.pyplot as plt

input_values = [1, 2, 3, 4, 5]
squares = [1, 4, 9, 16, 25]

'''''''The error is here'''''''''''''''
plt.style.use('seaborn')
'''''''''''''''''''''''''''''''''''''''
fig, ax = plt.subplots()
ax.plot(input_values, squares, linewidth=3)

# Set chart title and label axes.
ax.set_title("Square Numbers", fontsize=24)
ax.set_xlabel("Value", fontsize=14)
ax.set_ylabel("Square of Value", fontsize=14)

# Set size of tick labels.
ax.tick_params(axis='both', labelsize=14)

plt.show()

When I run from my text editor, I get the following error:

Traceback (most recent call last):
  File "/Users/leecreighton/Desktop/ehmatthes-pcc_2e-d6b34cf/chapter_15/plotting_simple_line_graph/mpl_squares.py", line 6, in <module>
    plt.style.use('seaborn')
AttributeError: 'module' object has no attribute 'style'

I have tried doing a clean uninstall and reinstall of anaconda, and I have tried installing matplotlib using pip, and I still get this error. I'm quite disheartened.

[scidam]

What version of matplotlib is installed on your computer, matplotlib.__version__?