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22/08/2022
Case assignment: your assignment is about classes & objects, classes & functions, introspection, object & object orientation and a small database project.
Required:
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:
When your zip file is done, send it in to CourseNet.
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