[Tutor] Looking up a value in a dictionary from user input problem

[chase pettet]

I am trying to write a script to work our LVS implementation.  I want to be
able to have  user do something like this "./script SITE SERVER" and have
the script look up the ip value of the site on that server and issue the
command to pull the status from LVS.  I am almost there but for some reason
when I try to pass the site parameter dynamically (the name of the
dictionary) I keep getting errors about value type.  I have two example that
work where the dictionary name is hard coded to to speak in the script, and
the value I want to pull is dynamic using sys.argv[1], and one where I'm
trying to pass the dictionary name and it does not work.  I tried to slim
thse examples down, so hopefully they are helpful:

works #1...

./script.py t

#!/usr/bin/env python
site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
"s2":"10.1.1.5", "s3":"10.1.1.6"}

def runBash(cmd):
  p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
  out = p.stdout.read().strip()
  return out

class LVS_Site:
  def show(self, site):
    showsite = "ipvsadm -L -t %s:443" % (site)
    showsiteresult = runBash(showsite)
    return showsiteresult

a = LVS_Site()
b = site["%s" % (sys.argv[1])]
c = a.show(b)
print ""
print ""
print ""
print c

works #2...

./script.py t

#!/usr/bin/env python
site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
"s2":"10.1.1.5", "s3":"10.1.1.6"}

def runBash(cmd):
  p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
  out = p.stdout.read().strip()
  return out

class LVS_Site:
  def show(self, site):
    showsite = "ipvsadm -L -t %s:443" % (site)
    showsiteresult = runBash(showsite)
    return showsiteresult

a = LVS_Site()
z = site
b = z["%s" % (sys.argv[1])]
c = a.show(b)
print ""
print ""
print ""
print c


Not working...

./script.py t site

#!/usr/bin/env python
site = {"l":"10.1.1.1", "t":"10.1.1.2", "x":"10.1.1.3", "s1":"10.1.1.4",
"s2":"10.1.1.5", "s3":"10.1.1.6"}

def runBash(cmd):
  p = subprocess.Popen(cmd, shell=True, stdout=subprocess.PIPE)
  out = p.stdout.read().strip()
  return out

class LVS_Site:
  def show(self, site):
    showsite = "ipvsadm -L -t %s:443" % (site)
    showsiteresult = runBash(showsite)
    return showsiteresult

a = LVS_Site()
z = sys.argv[2]
b = b["%s" % (sys.argv[1])]
c = a.show(b)
print ""
print ""
print ""
print c

Error:

Traceback (most recent call last):
  File "./python2.py", line 22, in ?
    b = z["%s" % (sys.argv[1])]
TypeError: string indices must be integers


I don't understand why the third one does not work. Thanks for any help!
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