Beginning Python - From Novice to Professional

CHAPTER 10 ■ BATTERIES INCLUDED 233
pid = raw_input('Enter unique ID number: ')
person = {}
person['name'] = raw_input('Enter name: ')
person['age'] = raw_input('Enter age: ')
person['phone'] = raw_input('Enter phone number: ')
db[pid] = person
def lookup_person(db):
"""
Query user for ID and desired field, and fetch the corresponding data from
the shelf object
"""
pid = raw_input('Enter ID number: ')
field = raw_input('What would you like to know? (name, age, phone) ')
field = field.strip().lower()
print field.capitalize() + ':', \
db[pid][field]
def print_help():
print 'The available commands are:'
print 'store : Stores information about a person'
print 'lookup : Looks up a person from ID number'
print 'quit : Save changes and exit'
print '? : Prints this message'
def enter_command():
cmd = raw_input('Enter command (? for help): ')
cmd = cmd.strip().lower()
return cmd
def main():
database = shelve.open('C:\\database.dat')
try:
while True:
cmd = enter_command()
if cmd == 'store':
store_person(database)
elif cmd == 'lookup':
lookup_person(database)
elif cmd == '?':
print_help()
elif cmd == 'quit':
return
finally:
database.close()
if __name__ == '__main__': main()