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Implementing Design Patterns with Python Assignment Grading Rubric
Criteria
Levels of Achievement
Advanced
Proficient
Developing
Not present
Selecting a pattern to be used in an
application or software task.
14 to 15 points
Pattern selected fits well in the
selected application.
11 to 13 points
Pattern selected will work in
selected application but does not fit
well and/or serve a beneficial
purpose
1 to 10 points
Pattern and application do not
fit well. For example, a
Mediator pattern makes little
sense in a single class
application.
0 points
Pattern and/or
application not
selected.
Singleton pattern integrated into a
previous assignment ensures that
there is only one instance of the
class in the application.
14 to 15 points
Code correctly implements the
Singleton pattern including just-in-
time initialization
11 to 13 points
Code correctly implements the
Singleton pattern but not just-in-
time initialization
1 to 10 points
Code implementing the
Singleton pattern is partially
correct
0 points
No implementation
Original application still functions
correctly after Singleton integration
14 to 15 points
No loss in functionality
11 to 13 points
No loss in functionality but usage
has new requirements
1 to 10 points
Some loss of functionality
0 points
No implementation
Documentation – source code is
well documented
5 points
Functions, variables, code blocks,
etc., are well documented.
Variable names follow industry
convention. Improper call syntax
results in a usage message back to
the user.
4 points
Modest but correct comments,
generally consistent and correct in
variable/function naming
1 to 3 points
Inaccurate and sparse
comments. Naming
conventions generally
inconsistent.
0 points
No comments
CSIS 354 Design Patterns Rev. B
Page 1 of 2
IMPLEMENTING DESIGN PATTERNS WITH PYTHON
Software Design Patterns may be thought of as blue prints or recipes for implementing common
models in software. Much like re-using proven classes in Object Oriented design, re-using
proven patterns tends to produce more secure and reliable results often in reduced time compared
to re-inventing the wheel. In fact, some high-level languages have integrated facilities to support
many common patterns with only minimal, if any, user written software. That said, in software
design and construction, often the challenge is to know that a pattern exists and be able to
recognize when it is a good fit for a project. To give you a familiar frame of reference, below is a
Singleton Pattern implemented in Java:
public class MySingleton {
// reference to class instance
private static MySingleton instance = null;
// Private Constructor
private MySingleton() {
instance = this;
}
// Returns single instance to class
public static MySingleton getInstance() {
if (instance == null) {
instance = new MySingleton();
}
return instance;
}
public static void main(String[] args)
{
MySingleton s1 = MySingleton.getInstance();
MySingleton s2 = MySingleton.getInstance();
System.out.println("s1: " + s1 + " s2: " + s2);
}
}
If you run this example, you will see that the address for s1 and s2 are exactly the same. That is
because the pattern restricts the existence of more than one instance in a process. Of course this
example only implements the pattern but other functionality can be added to this class just as any
other class. The primary features of a singleton are:
1. Private or restricted constructor
2. Internal variable for holding reference to single instance
3. Static method for retrieving the instance
The primary goal of this assignment is not to teach you how to write singleton patterns in
Python, (though that’s part of it), but to familiarize you with the concept of design patterns as
well as give you experience in adapting one into one of your own designs.
Description
CSIS 354 Design Patterns Rev. B
Page 2 of 2
1. Using an Internet Search Engine, search for common software design patterns. There are
many good resources such as https://en.wikipedia.org/wiki/Software_design_pattern.
Describe, in your own words, how one of these patterns could be used in an application
or software task. You are expected to write professionally, with proper grammar and
spelling, but you are not required to adhere to a specific format or cite any sources.
2. Pick one of your previous assignments, either from MindTap or one of your Distributed
Systems assignments and integrate a Singleton Pattern into it. Hint: Any class can be
made into a Singleton.
Test your code completely. At each step of the test take a screen shot and
embed it into a Word document. At the completion of the test compress (ZIP)
the Word document and your code into one ZIP file. Submit the ZIP file to the
appropriate assignment.
Submit your Python source files and Design Pattern document by 11:59 p.m. (ET) on Friday of
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job.py
-
Welcome
to
the
Bible:
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use
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app
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elt
Book
Nmae
:John
SPAN
MDL
RN
em
Te
aed
5
xx
as
chapter
to
exit
Book
Name:
John
Chapter
Number
:2
Verse:l
tte
eeee
Now
on
the
third
day
there
was
a
wedding
at
Cana
in
Galil
0
here,
and his
disciples
were
also
invited
to
the
wedding.
ale)
see:
When
the
wine
ran
out,
Jesus’
mother
said
to
him,
“They
have
no
wine
left.”
Welcome
to
the
Bible:
To
use
this
app
please
supply
book
name
and
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ver
ele
Book
Nmae
:John
Enter
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as
chapter
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AM
ae
tele
a
fee
eet
ae
fee
eet
ae
Administrator:
Command
Prompt
-
python
job.py
0
invited
to
the
wedding.
eA
k
name
and
the
SR
een
emer
a
Administrator:
Command
Prompt
-
python
job.py
eee
Reet
th
eter
eem
ane)
ae
UR
or
eee
Roe
cet
as
Poet
Gee
Re
UR
eT
Cee
rT
ma
Cue
Cae
7
Sa
Coa
Space)
ene
Ey
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Saat
Pore
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