验证iam用户名是否已经存在

Question

您知道如何验证iam用户名是否已经存在？

我试着用下面的代码，使用get_user，但是当用户不存在时我得到一个错误：The user with name teste cannot be found。

你知道怎么做吗？

c = boto.iam.connect_to_region("us-east-1") 
while True: 
    username = raw_input("Username:") 
    password = raw_input("Password:") 
    if not username or not password: 
     print "Please enter a valid username and password" 
    if c.get_user(username): 
     print "Username already exist, please enter a different username..." 

新的尝试：

while True: 
    username = raw_input("Username:") 
    password = raw_input("Password:") 
    if not username or not password: 
     print "Please enter a valid username and password" 
    try: 
     if not c.get_user(username): 
      print "Username valid" 
    except BotoServerError, e: 
     print "Username already exist 

Answer 1

只要把一个try /除了随时待命，并处理异常。

from boto.exception import BotoServerError 
c = boto.iam.connect_to_region("us-east-1") 
while True: 
    username = raw_input("Username:") 
    password = raw_input("Password:") 
    if not username or not password: 
     print "Please enter a valid username and password" 
    try: 
     c.get_user(username) 
    except BotoServerError, e: 
     print(e.message)