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Case assignment: your assignment is about classes & objects, classes & functions, introspection, object & object orientation and a small database project.

Required:

 

 

  1. Read chapters 15, 16 from “Think Python: How to Think Like a Computer Scientist (Version 1.3.3)”, a reference in the background materials. Code all the examples and exercises into the Python IDLE and successfully run them. Save the final programs into Python files.
  2. Read chapters 4 & 5 from Dive into Python, a reference in the background materials. Code all the examples and exercises into the Python IDLE and successfully run them. Save the final programs into Python files.
  3. You’ve been going to work on a database project at work for sometime now. Your boss encourages you to program the database in Python. You disagree, arguing that Python is not a database language but your boss persists by providing the source code below for a sample telephone database. He asks you to do two things: 1. Evaluate the existing source code and extend it to make it useful for managers in the firm. (You do not need a GUI interface, just work on the database aspects: data entry and retrieval – of course you must get the program to run or properly work, and 2. He wants you to critically evaluate Python as a database tool.

Import the sample code below into the Python IDLE and enhance it, run it and debug it. Add features to make this a more realistic database tool by providing for easy data entry and retrieval. Export your successful program to a Python file for later upload to coursenet.

Here is the sample source code:

#!/usr/bin/python
#
# An example from Sean Reifschneider’s Python Tutorial at Linux Expo 98.
#
# Copyright (c) 1998 Sean Reifschneider, tummy.com, ltd.
# This program is free software; you can redistribute it and/or
# modify it under the terms of the GNU General Public License
# as published by the Free Software Foundation; either version 2
# of the License, or (at your option) any later version.

# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.

# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 59 Temple Place – Suite 330, Boston, MA 02111-1307, USA.
#
# You can contact Sean Reifschneider at
# P.O. Box 270624,
# Fort Collins, CO USA 80527-0624,
# or at [email protected]
#
# Simple phone-number database module

import shelve
import string

UNKNOWN = 0
HOME = 1
WORK = 2
FAX = 3
CELL = 4

class phoneentry:
def __init__(self, name=”Unknown”, number=”Unknown”,
type = UNKNOWN):
self.name = name
self.number = number
self.type = type

# create string representation
def __repr__(self):
return(‘%s:%d’ % ( self.name, self.type ))

# fuzzy compare or two items
def __cmp__(self, that):
this = string.lower(str(self))
that = string.lower(that)

if string.find(this, that) >= 0:
return(0)
return(cmp(this, that))

def showtype(self):
if self.type == UNKNOWN: return(‘Unknown’)
if self.type == HOME: return(‘Home’)
if self.type == WORK: return(‘Work’)
if self.type == FAX: return(‘Fax’)
if self.type == CELL: return(‘Cellular’)

class phonedb:
def __init__(self, dbname=”phonedata”):
self.dbname = dbname;
self.shelve = shelve.open(self.dbname);

def __del__(self):
self.shelve.close()
self.shelve = None

def add(self, name, number, type = HOME):
e = phoneentry(name, number, type)
self.shelve[str(e)] = e

def lookup(self, string):
list = []
for key in self.shelve.keys():
e = self.shelve[key]
if cmp(e, string) == 0:
list.append(e)

return(list)

# if not being loaded as a module, run a small test
if __name__ == ‘__main__’:
foo = phonedb()
foo.add(‘Sean Reifschneider’, ‘970-555-1111’, HOME)
foo.add(‘Sean Reifschneider’, ‘970-555-2222’, CELL)
foo.add(‘Evelyn Mitchell’, ‘970-555-1111’, HOME)

print ‘First lookup:’
for entry in foo.lookup(‘reifsch’):
print ‘%-40s %s (%s)’ % ( entry.name, entry.number, entry.showtype() )
print

print ‘Second lookup:’
for entry in foo.lookup(‘e’):
print ‘%-40s %s (%s)’ % ( entry.name, entry.number, entry.showtype() )

Add all your saved Python files from requirements 1 – 3 above into a zip file. Add to the zip file, a one page description of what you have accomplished and what benefits you have achieved.

Case assignment expectations:

  • Code all the required examples and exercises and successfully run them.
  • Provide a paper describing what you accomplished and what benefits you have achieved.

When your zip file is done, send it in to CourseNet.

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Approximate price: $22

July 1, 2023
    

 

 

3.3   Market Equilibrium: Putting Demand and Supply Together

 

1) At market equilibrium,

A) demand equals supply.

B) quantity demanded equals quantity supplied.

C) surpluses are greater than shortages.

D) shortages are greater than surpluses.

 

2) At a product's equilibrium price

A) anyone who needs the product will be able to buy the product, regardless of ability to pay.

B) the federal government will provide the product to anyone who cannot afford it.

C) not all sellers who are willing to accept the price will find buyers for their products.

D) any buyer who is willing and able to pay the price will find a seller for the product.

 

 

Figure 3-3

 

 

3) Refer to Figure 3-3. The figure above shows the supply and demand curves for two markets: the market for original Michelangelo sculptures and the market for Ray Ban sunglasses. Which graph most likely represents which market?

A) Graph B represents the market for original Michelangelo sculptures and Graph A represents the market for Ray Ban sunglasses.

B) Graph A represents the market for original Michelangelo sculptures and Graph B represents the market for Ray Ban sunglasses.

C) Graph A represents both the market for original Michelangelo sculptures and Ray Ban sunglasses.

D) Graph B represents both the market for original Michelangelo sculptures and Ray Ban sunglasses.

 

4) Hurricane Katrina damaged a large portion of refining and pipeline capacity when it swept through the Gulf coast states in August 2005. As a result of this, many gasoline distributors were not able to maintain normal deliveries. At the pre-hurricane equilibrium price (i.e., at the initial equilibrium price), we would expect to see

A) a surplus of gasoline.

B) the quantity demanded equal to the quantity supplied.

C) a shortage of gasoline.

D) an increase in the demand for gasoline.

 

 

Figure 3-4

 

5) Refer to Figure 3-4.  If the price is $25,

A) there would be a surplus of 300 units.

B) there would be a shortage of 300 units.

C) there would be a surplus of 200 units.

D) there would be a shortage of 200 units.

 

6) Refer to Figure 3-4.  At a price of $25, how many units will be sold?

A) 400

B) 500

C) 600

D) 800

 

 

7) Refer to Figure 3-4.  At a price of $25, how many units will be supplied?

A) 400

B) 500

C) 600

D) 800

 

 

8) Refer to Figure 3-4. If the current market price is $25, the market will achieve equilibrium by

A) a price increase, increasing the supply and decreasing the demand.

B) a price decrease, decreasing the supply and increasing the demand.

C) a price decrease, decreasing the quantity supplied and increasing the quantity demanded.

D) a price increase, increasing the quantity supplied and decreasing the quantity demanded.

 

 

9) Refer to Figure 3-4.  At a price of $20, how many units will be sold?

A) 400

B) 500

C) 600

D) 800

 

10) Refer to Figure 3-4.  At a price of $20, how many units will be supplied?

A) 400

B) 500

C) 600

D) 800

 

 

 

default image
July 1, 2023
    

 

 

3.3   Market Equilibrium: Putting Demand and Supply Together

 

1) At market equilibrium,

A) demand equals supply.

B) quantity demanded equals quantity supplied.

C) surpluses are greater than shortages.

D) shortages are greater than surpluses.

 

2) At a product's equilibrium price

A) anyone who needs the product will be able to buy the product, regardless of ability to pay.

B) the federal government will provide the product to anyone who cannot afford it.

C) not all sellers who are willing to accept the price will find buyers for their products.

D) any buyer who is willing and able to pay the price will find a seller for the product.

 

 

Figure 3-3

 

 

3) Refer to Figure 3-3. The figure above shows the supply and demand curves for two markets: the market for original Michelangelo sculptures and the market for Ray Ban sunglasses. Which graph most likely represents which market?

A) Graph B represents the market for original Michelangelo sculptures and Graph A represents the market for Ray Ban sunglasses.

B) Graph A represents the market for original Michelangelo sculptures and Graph B represents the market for Ray Ban sunglasses.

C) Graph A represents both the market for original Michelangelo sculptures and Ray Ban sunglasses.

D) Graph B represents both the market for original Michelangelo sculptures and Ray Ban sunglasses.

 

4) Hurricane Katrina damaged a large portion of refining and pipeline capacity when it swept through the Gulf coast states in August 2005. As a result of this, many gasoline distributors were not able to maintain normal deliveries. At the pre-hurricane equilibrium price (i.e., at the initial equilibrium price), we would expect to see

A) a surplus of gasoline.

B) the quantity demanded equal to the quantity supplied.

C) a shortage of gasoline.

D) an increase in the demand for gasoline.

 

 

Figure 3-4

 

5) Refer to Figure 3-4.  If the price is $25,

A) there would be a surplus of 300 units.

B) there would be a shortage of 300 units.

C) there would be a surplus of 200 units.

D) there would be a shortage of 200 units.

 

6) Refer to Figure 3-4.  At a price of $25, how many units will be sold?

A) 400

B) 500

C) 600

D) 800

 

 

7) Refer to Figure 3-4.  At a price of $25, how many units will be supplied?

A) 400

B) 500

C) 600

D) 800

 

 

8) Refer to Figure 3-4. If the current market price is $25, the market will achieve equilibrium by

A) a price increase, increasing the supply and decreasing the demand.

B) a price decrease, decreasing the supply and increasing the demand.

C) a price decrease, decreasing the quantity supplied and increasing the quantity demanded.

D) a price increase, increasing the quantity supplied and decreasing the quantity demanded.

 

 

9) Refer to Figure 3-4.  At a price of $20, how many units will be sold?

A) 400

B) 500

C) 600

D) 800

 

10) Refer to Figure 3-4.  At a price of $20, how many units will be supplied?

A) 400

B) 500

C) 600

D) 800

 

 

 

default image
July 1, 2023
    

 

 

3.3   Market Equilibrium: Putting Demand and Supply Together

 

1) At market equilibrium,

A) demand equals supply.

B) quantity demanded equals quantity supplied.

C) surpluses are greater than shortages.

D) shortages are greater than surpluses.

 

2) At a product's equilibrium price

A) anyone who needs the product will be able to buy the product, regardless of ability to pay.

B) the federal government will provide the product to anyone who cannot afford it.

C) not all sellers who are willing to accept the price will find buyers for their products.

D) any buyer who is willing and able to pay the price will find a seller for the product.

 

 

Figure 3-3

 

 

3) Refer to Figure 3-3. The figure above shows the supply and demand curves for two markets: the market for original Michelangelo sculptures and the market for Ray Ban sunglasses. Which graph most likely represents which market?

A) Graph B represents the market for original Michelangelo sculptures and Graph A represents the market for Ray Ban sunglasses.

B) Graph A represents the market for original Michelangelo sculptures and Graph B represents the market for Ray Ban sunglasses.

C) Graph A represents both the market for original Michelangelo sculptures and Ray Ban sunglasses.

D) Graph B represents both the market for original Michelangelo sculptures and Ray Ban sunglasses.

 

4) Hurricane Katrina damaged a large portion of refining and pipeline capacity when it swept through the Gulf coast states in August 2005. As a result of this, many gasoline distributors were not able to maintain normal deliveries. At the pre-hurricane equilibrium price (i.e., at the initial equilibrium price), we would expect to see

A) a surplus of gasoline.

B) the quantity demanded equal to the quantity supplied.

C) a shortage of gasoline.

D) an increase in the demand for gasoline.

 

 

Figure 3-4

 

5) Refer to Figure 3-4.  If the price is $25,

A) there would be a surplus of 300 units.

B) there would be a shortage of 300 units.

C) there would be a surplus of 200 units.

D) there would be a shortage of 200 units.

 

6) Refer to Figure 3-4.  At a price of $25, how many units will be sold?

A) 400

B) 500

C) 600

D) 800

 

 

7) Refer to Figure 3-4.  At a price of $25, how many units will be supplied?

A) 400

B) 500

C) 600

D) 800

 

 

8) Refer to Figure 3-4. If the current market price is $25, the market will achieve equilibrium by

A) a price increase, increasing the supply and decreasing the demand.

B) a price decrease, decreasing the supply and increasing the demand.

C) a price decrease, decreasing the quantity supplied and increasing the quantity demanded.

D) a price increase, increasing the quantity supplied and decreasing the quantity demanded.

 

 

9) Refer to Figure 3-4.  At a price of $20, how many units will be sold?

A) 400

B) 500

C) 600

D) 800

 

10) Refer to Figure 3-4.  At a price of $20, how many units will be supplied?

A) 400

B) 500

C) 600

D) 800

 

 

 

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