未定义具有__main__全局名称的python telnet函数

Question

I'm newbie of using python. I'm going to write a simple telnet program but stack in place.

telnet.py

def pingfunc():
    global domainname
    host  = "1.1.1.1"
    user  = "user1"
    password = "password2"
    telnet  = telnetlib.Telnet(host)
    telnet.read_until('Username: ', 3)
    telnet.write(user + '\r')
    telnet.read_until('Password: ', 3)
    telnet.write(password + '\r')
    telnet.write("ping " +  domainname + "\r\n")
    time.sleep(3)
    print telnet.read_very_eager()

if __name__ == "__main__":
    global domainname
    query_string = cgi.parse_qs(os.environ['QUERY_STRING'])
    domainname = query_string.get('domainname', ["www.google.com"])[0]
    count = query_string.get('count', [COUNT])[0]

when I call the function (pingfunc), the following error occurred:

Traceback (most recent call last):   
File "<string>", line 1, in <module>   
telnet.write("ping " +  domainname + "\r\n")   
NameError: global name 'domainname' is not defined

May you help for this case?

Answer 1

You're using the variable domainname in function pingfunc() without declaring it before (or passing it to the function as an argument).

Assuming domainname is already defined when you're calling the function, simply change the function signature.

Change the line:

def pingfunc():

with:

def pingfunc(domainname):

and when you call the function, pass domainname as an argument.