这个程序是唯一一次不看老师代码，自己敲出来的，敲出来后还是有报错的，但是以自己现在的能力水平自己不知道如何改进，也希望各位网友可以提出来，谢谢。其实老师的程序也不是面面俱到，也是有很多的bug，但是可以运行下来，里边的一些写脚本思路也是可以借鉴的。
原始程序：
#!/usr/bin/env python
register = {}
def newuser():
while True:
username = raw_input("username: ")
if register.get(username, "exist,try again"):
break
pwd = raw_input("password: ")
register = {username:pwd }
print "register ok!!!"
def olduser():
while True:
username = raw_input("username: ")
if not register.get(username):
print "not exist, try again"
break
pwd = raw_input("password: ")
if register(username) == pwd:
print "login successfll"
CMDs = {"1":newuser, "2":olduser}
def main():
prompt = """(1)new user register
(2)olduser loging
(3)quit
please input your choice(1/2/3): """
while True:
choice = raw_input(prompt).strip()[0]
if choice not in "123":
print "Invalid choice,try again"
continue
if choice == "3":
break
CMDs[choice]()
if __name__ == "__main__":
main()
老师程序
#!/usr/bin/env python
import getpass
user_dict = {}
def new_user():
username = raw_input("username: ")
if username not in user_dict:
password = raw_input("password: ")
user_dict[username] = password
def old_user():
username = raw_input("username: ")
password = getpass.getpass("password: ")
if user_dict.get(username) == password:
print "Login successful!"
else:
print "Login incorrect."
CMDs = {"0":new_user, "1":old_user}
def show_menu():
prompt = """(0)register user
(1)user login
(2)quit
Please input your choice(0/1/2): """
while True:
choice = raw_input(prompt).strip()[0]
if choice not in "012":
print "Invalid choice. Try agin."
continue
if choice == "2":
break
CMDs[choice]()
if __name__ == "__main__":
show_menu()
