Do Nested try: ... except: 's work?

[Chad Everett]

On Fri, 15 Jun 2001 19:10:38 -0000, jestes39 at yahoo.com <jestes39 at yahoo.com> wrote:
>I am trying to use the try: ... except: structure as it is used in 
>Oracle for flow control. I am nesting try/except blocks and raising 
>named excepts. Each time it gets to a raise statement that is 
>referencing an except outside the current block, it fails and gives 
>me an error similar to 'there is no variable named <except name>'.
>Here is a short section to illustrate my point:
>
>  import telnetlib
>
>  try:
>      try:
>          tn = telnetlib.Telnet('xxx.xxx.xxx.xxx')
>      except:
>          no_connect_flag = 'TRUE'
>
>      if no_connect_flag == 'TRUE':
>          raise no_connect
>
>      try:
>          tn.set_debuglevel(100)
>      except:
>          print 'couldn''t set the debug level'
>  except no_connect:
>      print 'couldn''t open telnet connection'
>
>When I run this script through the debugger, I get the error:
>  
>  NameError: There is no variable named 'no_connect'
>
>Any help would be appreciated. Thanks.
>
>jestes3 at logicon.com
>
>

import telnetlib
import exceptions


class no_connect(exceptions.Exception):
    def __init__(self,args=None):
        self.args = args


try:
    try:
        tn = telnetlib.Telnet('xxx.xxx.xxx.xxx')
    except:
        no_connect_flag = 'TRUE'

    if no_connect_flag == 'TRUE':
        raise no_connect

    try:
        tn.set_debuglevel(100)
    except:
        print 'couldn''t set the debug level'

except no_connect:
    print 'couldn''t open telnet connection'




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