Programming Python - 1. Preview -1.4 Adding Console Interaction

 

 

 

 

 

 

 

 

 

 

 

 

 

#peopleinteract_query

import shelve
fieldnames=('name', 'age','job','pay')
maxfield=max(len(f) for f in fieldnames)

db=shelve.open('class-shelve')

while True:
    key=input('\nKey?=>')
    if not key: break
    try:
        record=db[key]
    except:
        print('No such key %s!' % key)
    else:
        for field in fieldnames:
            print(field.ljust(maxfield),'=>', getattr(record, field))
            #record is class, so we cannot use record[field]); getattr, extracts the content of class

 

 

#peopleinteract_update
#interactive updates
import shelve
from person import Person

fieldnames=('name', 'age', 'job','pay')

db=shelve.open('class-shelve')
while True:
    key=input('\nKey? =>')
    if not key: break
    if key in db:
        record=db[key]
    else:
        record=Person(name='?', age='?')
    
    for field in fieldnames:
        curval=getattr(record, field)
        next=input('\t[%s]=%s\n\tnew?=>' % (field, curval))
        if next:
            setattr(record, field, eval(next))
        　　#class, assign values
    db[key]=record
db.close()