Duplicate matplotlib import in line 2 and redundant set_title() call in line 22

[AldoOmarAndres]

Description

In the ch09.ipynb notebook, there are two minor redundancies that could be cleaned up for clarity and efficiency:

• Duplicate import of matplotlib.pyplot in line 2: The module is imported twice unnecessarily.
• Redundant set_title() call in line 22: The same method is called twice on the same axis object, which may cause confusion or override the intended title.

Suggested Fix

• Remove one of the matplotlib.pyplot imports.
• Consolidate or remove the repeated set_title() call to ensure the intended title is displayed.

File

ch09.ipynb

Reference

Line 21:

...
ax.set_title("Important dates in the 2008–2009 financial crisis")

Line 22:

ax.set_title("Important dates in the 2008–2009 financial crisis")