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 jafo-gpl@tummy.com
#
# 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() )