list and dict

'''
Created on 2011-9-29

@author: xgzhao
'''
list2 = list('foo')
print list2
list2.remove('f')
print list2

print [i*2 for i in range(8) if i%2 == 0]

print [i for i in reversed(range(8))]

fdict = dict((['x', 1], ['y', 2]))
print fdict

tdict = {}
print tdict
print fdict.keys(), fdict.values(), fdict.items()

'''
Created on 2011-9-29

@author: xgzhao
'''
db = {}

def newUser():
    prompt = 'login desired: '
    while True:
        name = raw_input(prompt)
        if db.has_key(name):
            prompt = 'name taken, try another'
            continue
        else:
            break
    pwd = raw_input('password: ')
    db[name] = pwd

def oldUser():
    name = raw_input('login: ')
    pwd = raw_input('password: ')
    passwd = db.get(name)
    if passwd == pwd:
        print 'Welcome back ', name
    else:
        print 'login incorrect'

def showmenu():
    prompt = """
(N)ew User Login
(E)xisting User Login
(Q)uit 
Enter choice = """