diff --git a/pep8-beautiful-code/README.md b/pep8-beautiful-code/README.md
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+# How to Write Beautiful Python Code With PEP 8
+
+This repository contains code snippets shown in the tutorial on [How to Write Beautiful Python Code With PEP 8](https://realpython.com/python-pep8/).
+
+You can uncomment the code that isn't PEP 8 compliant in the following files if you want to test the errors, linters, and autoformatters described in the tutorial:
+
+- [`mixed_indentation.py`](./mixed_indentation.py)
+- [`trailing_whitespace.py`](./trailing_whitespace.py)
+- [`unfashionable.py`](./unfashionable.py)
+
+After uncommenting the code, you can then run, lint, and format the files locally.
diff --git a/pep8-beautiful-code/documented_module.py b/pep8-beautiful-code/documented_module.py
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+++ b/pep8-beautiful-code/documented_module.py
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+"""This is a docstring."""
+
+# ...
diff --git a/pep8-beautiful-code/mixed_indentation.py b/pep8-beautiful-code/mixed_indentation.py
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+++ b/pep8-beautiful-code/mixed_indentation.py
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+# Uncomment the code below
+# for an example of code with mixed indentation:
+
+# def mixed_indentation(greet=True):
+#     if greet:
+#         print("Hello")  # Indented with 4 spaces.
+# 	print("World")  # Indented with a tab.
+
+# mixed_indentation()
diff --git a/pep8-beautiful-code/quadratic.py b/pep8-beautiful-code/quadratic.py
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+++ b/pep8-beautiful-code/quadratic.py
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+def quadratic(a, b, c):
+    """Solve quadratic equation via the quadratic formula.
+
+    A quadratic equation has the following form:
+    ax**2 + bx + c = 0
+
+    There always two solutions to a quadratic equation: x_1 & x_2.
+    """
+    x_1 = (-b + (b**2 - 4 * a * c) ** (1 / 2)) / (2 * a)
+    x_2 = (-b - (b**2 - 4 * a * c) ** (1 / 2)) / (2 * a)
+
+    return x_1, x_2
diff --git a/pep8-beautiful-code/trailing_whitespace.py b/pep8-beautiful-code/trailing_whitespace.py
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+++ b/pep8-beautiful-code/trailing_whitespace.py
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+# Uncomment the code below
+# for an example of code with a trailing whitespace:
+
+# x = 1 + 2 + \  # noqa w291
+#     3 + 4
+
+# print(x)
diff --git a/pep8-beautiful-code/unfashionable.py b/pep8-beautiful-code/unfashionable.py
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+++ b/pep8-beautiful-code/unfashionable.py
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+numbers = [1, 2, 3, 4]
+
+
+def add_all_numbers_from_collection(
+    number_one, number_two, number_three, number_four
+):
+    return number_one + number_two + number_three + number_four
+
+
+print(add_all_numbers_from_collection(*numbers))
+
+# The commented-out code shows the code before linting and formatting:
+
+# import math
+
+# numbers = [1,2,\
+# 3,4]
+
+# def add_all_numbers_from_collection(
+#     number_one, number_two, number_three,
+#     number_four):
+#     return number_one+number_two + number_three +number_four
+
+# print (add_all_numbers_from_collection( *numbers ))
diff --git a/pep8-beautiful-code/variance.py b/pep8-beautiful-code/variance.py
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+++ b/pep8-beautiful-code/variance.py
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+def calculate_variance(number_list):
+    sum_list = 0
+    for number in number_list:
+        sum_list = sum_list + number
+    mean = sum_list / len(number_list)
+
+    sum_squares = 0
+    for number in number_list:
+        sum_squares = sum_squares + number**2
+    mean_squares = sum_squares / len(number_list)
+
+    return mean_squares - mean**2