[Python] Matplotlib not found on Jupyter notebook

I'm new to command line programming so please bear with me. I've been trying to run matplotlib inline in my Jupyter notebook using the following command:

%matplotlib inline


and I get the following error

ModuleNotFoundError Traceback (most recent call last)
<ipython-input-1-88ca88d21acc> in <module>
2 #We will use this to think about regression
3 import numpy as np
----> 4 get_ipython().run_line_magic('matplotlib', 'inline')
5
6 from sklearn import datasets, linear_model

~/.pyenv/versions/jupyter3/lib/python3.8/site-packages/IPython/core/interactiveshell.py in run_line_magic(self, magic_name, line, _stack_depth)
2324 kwargs['local_ns'] = sys._getframe(stack_depth).f_locals
2325 with self.builtin_trap:
-> 2326 result = fn(*args, **kwargs)
2327 return result
2328

<decorator-gen-108> in matplotlib(self, line)

~/.pyenv/versions/jupyter3/lib/python3.8/site-packages/IPython/core/magic.py in <lambda>(f, *a, **k)
185 # but it's overkill for just that one bit of state.
186 def magic_deco(arg):
--> 187 call = lambda f, *a, **k: f(*a, **k)
188
189 if callable(arg):

~/.pyenv/versions/jupyter3/lib/python3.8/site-packages/IPython/core/magics/pylab.py in matplotlib(self, line)
97 print("Available matplotlib backends: %s" % backends_list)
98 else:
---> 99 gui, backend = self.shell.enable_matplotlib(args.gui.lower() if isinstance(args.gui, str) else args.gui)
100 self._show_matplotlib_backend(args.gui, backend)
101

~/.pyenv/versions/jupyter3/lib/python3.8/site-packages/IPython/core/interactiveshell.py in enable_matplotlib(self, gui)
3417 """
3418 from IPython.core import pylabtools as pt
-> 3419 gui, backend = pt.find_gui_and_backend(gui, self.pylab_gui_select)
3420
3421 if gui != 'inline':

~/.pyenv/versions/jupyter3/lib/python3.8/site-packages/IPython/core/pylabtools.py in find_gui_and_backend(gui, gui_select)
278 """
279
--> 280 import matplotlib
281
282 if gui and gui != 'auto':

ModuleNotFoundError: No module named 'matplotlib'


After running both python and Ipython on my command line, I'm confident that both of them are running through the same python 3.8.3 install. I'm not sure why the matplotlib library is not available to the pylabtools.py script if this is the case.

For reference, I installed everything using the instructions located at https://medium.com/@henriquebastos/the-definitive-guide-to-setup-my-python-workspace-628d68552e14.

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