Database System Concepts
Database System Concepts
7th Edition
ISBN: 9780078022159
Author: Abraham Silberschatz Professor, Henry F. Korth, S. Sudarshan
Publisher: McGraw-Hill Education
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How to make this Python code run?

# RollDie.py
"""Graphing frequencies of die rolls with Seaborn."""
import matplotlib.pyplot as plt
import numpy as np
import random
import seaborn as sns
import sys

# use list comprehension to create a list of rolls of a six-sided die
rolls = [random.randrange(1, 7) for i in range(int(sys.argv[1]))]


# NumPy uniq nue function returns unique faces and frequency of each face
values, frequencies = np.unique(rolls, return_counts=True)

title = f'Rolling a Six-Sided Die {len(rolls):,} Times'
sns.set_style('whitegrid') # white backround with gray grid lines
axes = sns.barplot(values, frequencies, palette='bright') # create bars
axes.set_title(title) # set graph title
axes.set(xlabel='Die Value', ylabel='Frequency') # label the axes

# scale y-axis by 10% to make room for text above bars
axes.set_ylim(top=max(frequencies) * 1.10)

# display frequency & percentage above each patch (bar)
for bar, frequency in zip(axes.patches, frequencies):
text_x = bar.get_x() + bar.get_width() / 2.0
text_y = bar.get_height()
text = f'{frequency:,}\n{frequency / len(rolls):.3%}'
axes.text(text_x, text_y, text,
fontsize=11, ha='center', va='bottom')

plt.show() # display graph

Expert Solution
Check Mark
Step 1

You need to call the script RollDie.py from command line as shown below

In the directory where the script is saved, open command line, then type

python3 RollDie.py 1000

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