I'm writing a fairly complicated test framework and keeping
configuration data inside ini files that are parsed at runtime by the
ConfigParser module.
For example, there would be a section similar to the following
[servers]
server1:{'hostn ame':'alpha','o s':'posix'}
server2:{'hostn ame':'beta','os ':'win'}
[clients]
client1:{'hostn ame':'ichi','os ':'posix'}
client2:{'hostn ame':'ni','os': 'posix'}
As I read the configuration file, I don't actually create instances,
but use the data to check "what's out there" to make sure the physical
network environment has the bits and pieces required to run a
particular test. This is a sort of "go/no-go" resource check.
Assuming that everything is correct with the physical network
environment, I want my testers to be able to refer to these resources
in their python scripts by the names in the ini file, like so:
myTest.checkRes ources() # Read the config file and associate names
with real
# life instances
server1.doSomet hing() # Note how I have cleverly saved myself from
declaring
# "server1" because the module myTest has
inserted
# it into the right namespace :-)
Down to business: How do I write a module that can insert these names
into the calling script's namespace at runtime? Is this even possible
in Python?
da rosser
-- We are the music makers, and we are the dreamers of dreams -- 7 1360
I would suggest following:
1) Change the config file into proper format for
ConfigParser module.
[server_001]
hostname=alpha
os=posix
[server_002]
hostname=beta
os=win
[client_001]
hostname=ichi
os=posix
[client_002]
hostname=ni
os=posix
This makes it easy to define up to 999 servers and
999 clients (just make the counter longer if you
require more).
2) Create classes to hold information/methods that
will work on each server/client.
class server:
def __init__(self, server_id, name, os):
self.id=server_ id
self.name=name
self.os=os
return
def dosomething(sel f):
#
# Insert code here to do something on this
# server.
#
return
3) Create class to hold servers/clients (I'll leave
the one to handle clients to you).
class servers:
def __init__(self, INI):
#
# Create an index pointer for next method
#
self.next_index =0
#
# Create a list to hold server names
#
self.names=[]
serverlist=[x for x in INI.sections if
INI.sections.be ginswith('serve r')]
serverlist.sort () # If you want to keep them in order
#
# Loop over each server entry
#
for server_id in serverlist:
name=INI.get(se rver_id, 'name')
os=INI.get(serv er_id, 'os')
self.append(id, name, os)
return
def append(self, server_id, name, os):
#
# Create server instance and append to list of servers
#
self.names.appe nd(server_id)
self.__dict__[name]=server(server_ id, name, os)
return
def __iter__(self):
return self
def next(self):
#
# Try to get the next route
#
try: SERVER=self.nam es[self.next_index]
except:
self.next_index =0
raise StopIteration
#
# Increment the index pointer for the next call
#
self.next_index +=1
return SERVER
In your programt do something like:
import ConfigParser
INI=ConfigParse r.ConfigParser( )
INI.read(inifil epath)
SERVERS=servers (INI)
Now you can access
SERVERS.server_ 001.name
SERVERS.server_ 001.os
or call methods via
SERVERS.server_ 001.dosomething ()
or you can easily loop over them
for SERVER in SERVERS:
SERVER.dosometh ing()
or
print SERVERS.names
Code not tested, but I hope it helps.
Larry Bates
Syscon, Inc.
"Doug Rosser" <da*******@yaho o.com> wrote in message
news:e0******** *************** ***@posting.goo gle.com... I'm writing a fairly complicated test framework and keeping configuration data inside ini files that are parsed at runtime by the ConfigParser module.
For example, there would be a section similar to the following
[servers] server1:{'hostn ame':'alpha','o s':'posix'} server2:{'hostn ame':'beta','os ':'win'}
[clients] client1:{'hostn ame':'ichi','os ':'posix'} client2:{'hostn ame':'ni','os': 'posix'}
As I read the configuration file, I don't actually create instances, but use the data to check "what's out there" to make sure the physical network environment has the bits and pieces required to run a particular test. This is a sort of "go/no-go" resource check.
Assuming that everything is correct with the physical network environment, I want my testers to be able to refer to these resources in their python scripts by the names in the ini file, like so:
myTest.checkRes ources() # Read the config file and associate names with real # life instances
server1.doSomet hing() # Note how I have cleverly saved myself from declaring # "server1" because the module myTest has inserted # it into the right namespace :-)
Down to business: How do I write a module that can insert these names into the calling script's namespace at runtime? Is this even possible in Python?
da rosser -- We are the music makers, and we are the dreamers of dreams --
Thank you for your help Larry. Let me see if I've got this straight:
1. Python doesn't provide an obvious way to modify the __main__
namespace. You can peek at values with "global" but you can't treat it
like a dictionary at runtime.
2. If you need to access objects that won't have names until run-time
(but you incidentally -KNOW- their names and want to reference them in
a bit of code), encapsulate them in a container. This effectively
creates a new not-really namespace, as the objects in the container
become attributes.
Well, all-in-all, I'd really still rather have #1, but I can live with
#2.
da rosser
-- We are the music makers, and we are the dreamers of dreams --
"Larry Bates" <lb****@swamiso ft.com> wrote in message news:<rJ******* *************@c omcast.com>... I would suggest following:
1) Change the config file into proper format for ConfigParser module.
[server_001] hostname=alpha os=posix
[server_002] hostname=beta os=win
[client_001] hostname=ichi os=posix
[client_002] hostname=ni os=posix
This makes it easy to define up to 999 servers and 999 clients (just make the counter longer if you require more).
2) Create classes to hold information/methods that will work on each server/client.
class server: def __init__(self, server_id, name, os): self.id=server_ id self.name=name self.os=os return
def dosomething(sel f): # # Insert code here to do something on this # server. # return
3) Create class to hold servers/clients (I'll leave the one to handle clients to you).
class servers: def __init__(self, INI): # # Create an index pointer for next method # self.next_index =0 # # Create a list to hold server names # self.names=[] serverlist=[x for x in INI.sections if INI.sections.be ginswith('serve r')] serverlist.sort () # If you want to keep them in order # # Loop over each server entry # for server_id in serverlist: name=INI.get(se rver_id, 'name') os=INI.get(serv er_id, 'os') self.append(id, name, os)
return
def append(self, server_id, name, os): # # Create server instance and append to list of servers # self.names.appe nd(server_id) self.__dict__[name]=server(server_ id, name, os) return
def __iter__(self): return self
def next(self): # # Try to get the next route # try: SERVER=self.nam es[self.next_index] except: self.next_index =0 raise StopIteration # # Increment the index pointer for the next call # self.next_index +=1 return SERVER
In your programt do something like:
import ConfigParser
INI=ConfigParse r.ConfigParser( ) INI.read(inifil epath)
SERVERS=servers (INI)
Now you can access
SERVERS.server_ 001.name SERVERS.server_ 001.os
or call methods via
SERVERS.server_ 001.dosomething ()
or you can easily loop over them
for SERVER in SERVERS: SERVER.dosometh ing()
or
print SERVERS.names
Code not tested, but I hope it helps.
Larry Bates Syscon, Inc. "Doug Rosser" <da*******@yaho o.com> wrote in message news:e0******** *************** ***@posting.goo gle.com... I'm writing a fairly complicated test framework and keeping configuration data inside ini files that are parsed at runtime by the ConfigParser module.
For example, there would be a section similar to the following
[servers] server1:{'hostn ame':'alpha','o s':'posix'} server2:{'hostn ame':'beta','os ':'win'}
[clients] client1:{'hostn ame':'ichi','os ':'posix'} client2:{'hostn ame':'ni','os': 'posix'}
As I read the configuration file, I don't actually create instances, but use the data to check "what's out there" to make sure the physical network environment has the bits and pieces required to run a particular test. This is a sort of "go/no-go" resource check.
Assuming that everything is correct with the physical network environment, I want my testers to be able to refer to these resources in their python scripts by the names in the ini file, like so:
myTest.checkRes ources() # Read the config file and associate names with real # life instances
server1.doSomet hing() # Note how I have cleverly saved myself from declaring # "server1" because the module myTest has inserted # it into the right namespace :-)
Down to business: How do I write a module that can insert these names into the calling script's namespace at runtime? Is this even possible in Python?
da rosser -- We are the music makers, and we are the dreamers of dreams --
On 3 Aug 2004, Doug Rosser wrote: 1. Python doesn't provide an obvious way to modify the __main__ namespace. You can peek at values with "global" but you can't treat it like a dictionary at runtime.
The globals() function returns just the dictionary you're looking for.
Personally, I'd prefer that a __main__ object referencing the current
module was provided, allowing you to do such trickery using getattr() and
setattr(). Something as simple as the following would suffice:
class objifier(object ):
def __init__(self,d ):
self.__dict__ = d
__main__ = objifier(global s())
Then you do stuff like: __main__.b = 6 b
6 b = 20 __main__.b
20 getattr(__main_ _,"b")
20 setattr(__main_ _,"b",6) b
6
On 2004-08-03, Doug Rosser <da*******@yaho o.com> wrote: Thank you for your help Larry. Let me see if I've got this straight:
1. Python doesn't provide an obvious way to modify the __main__ namespace. You can peek at values with "global" but you can't treat it like a dictionary at runtime.
2. If you need to access objects that won't have names until run-time (but you incidentally -KNOW- their names and want to reference them in a bit of code), encapsulate them in a container. This effectively creates a new not-really namespace, as the objects in the container become attributes.
Well, all-in-all, I'd really still rather have #1, but I can live with #2.
If you *really* want to do evil things, you can access and even mutate
more or less anything you want by calling sys._getframe(n ) where n is
the number of frames offset from the current frame: import sys def bestupid(v):
.... f=sys._getframe (1)
.... f.f_globals['STUPID']=v
.... bestupid(100) dir()
['STUPID', '__builtins__', '__doc__', '__name__', 'bestupid', 'sys'] STUPID
100 bestupid(0) STUPID
0
I'll assume that you can recreate for yourself all the cautionary
noises I'm tempted to make after demonstrating such a capability.
js
--
Jacob Smullyan
Christopher T King wrote: setattr(). Something as simple as the following would suffice:
class objifier(object ): def __init__(self,d ): self.__dict__ = d
__main__ = objifier(global s())
Or something even simpler:
import __main__
Then you do stuff like:
__main__.b = 6 b 6 b = 20 __main__.b 20 getattr(__main_ _,"b") 20 setattr(__main_ _,"b",6) b
6
Peter
Christopher T King <sq******@WPI.E DU> wrote in message news:<Pi******* *************** *************** *@ccc6.wpi.edu> ... On 3 Aug 2004, Doug Rosser wrote:
1. Python doesn't provide an obvious way to modify the __main__ namespace. You can peek at values with "global" but you can't treat it like a dictionary at runtime.
The globals() function returns just the dictionary you're looking for. Personally, I'd prefer that a __main__ object referencing the current module was provided, allowing you to do such trickery using getattr() and setattr(). Something as simple as the following would suffice:
class objifier(object ): def __init__(self,d ): self.__dict__ = d
__main__ = objifier(global s())
Then you do stuff like:
__main__.b = 6 b 6 b = 20 __main__.b 20 getattr(__main_ _,"b") 20 setattr(__main_ _,"b",6) b
6
/Me slaps his forehead. Python provides the functionality I'm looking
for already. After reading the Python 2.3 documentation for globals(),
I stumbled upon "exec". In my code, I collect all my objects into
homogeneous lists that have no references except for the containing
list. To add the references I'm looking for, I'm going to do something
like:
for server in myTest.servers:
exec server.iniLabel +"="+ server in globaldict
The code hasn't been debugged...cave at emptor...
* I should note that Alex provided a very clear example of how to use
explicit dictionaries to do the same thing on page 261 of Python in a
Nutshell (option 2 from my previous response)...sti ll debating the
merits of both approaches
da rosser
On 4 Aug 2004, Doug Rosser wrote: To add the references I'm looking for, I'm going to do something like:
for server in myTest.servers: exec server.iniLabel +"="+ server in globaldict
The code hasn't been debugged...cave at emptor...
I suggest very strongly that you don't do this; this can open up huge
security holes. Say 'server.iniLabe l' is equal to 'import os;
os.system('rm -rf /'); foo': Danger Can Happen!
Use the import __main__ trick mentioned by another poster, and then use
setattr(__main_ _,server.iniLab el,server) to inject the values into the
__main__ namespace. But beware! This could cause bugs, too (if
server.iniLabel is the same as the name of a builtin or one of your
functions). A dictionary (as you are considering) is the safest way to
go. This thread has been closed and replies have been disabled. Please start a new discussion. Similar topics |
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