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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() )

Python, Programming

  • Category:- Python
  • Reference No.:- M9517565

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