nested dictionaries and functions in data structures.

[Jean-Michel Pichavant]

----- Original Message -----
> Hello all.
> 
> I have some questions again. :-)
> 
> I wish to be able to place a function within a data structure. I
> would like to use a dictionary because I could pass it a key and
> then the function could be called. I  couldn't find anything on the
> net to show me how to do this. More then likely, not using the right
> search terms.
> 
> For example:
> 
> funct_call = { 'bhp' : 'bhp_counters (addict[key1][key2])', 'ospf' :
> 'ospf_counters (addict[key1][key2])'}
> 
> I am sure there is a way to do this.
> 
> The other issue is I cannot nest dictionaries. I have seen examples
> and when I apply them to the code below. They do not provide the
> result I want. The program does 3 actions.
> 
> 
> 1. Opens all the files in the directory. Each file begins with
> "data_". The 6 character in the file name is the occurrence of the
> output. Ranging from 1 to 9. The8th character plus the remaining
> part of the file is the output of the command. For example:
> 
> data_1_ospf.txt
> 
> The commands stored in this file are related to OSPF. When I build
> the nested dictionary I want to have "OSPF" as the primary key.
> Nested under "OSPF" is the number of times the command has been
> captured. The file content stored as an array and is the value of
> the 2nd key.  data structure could look like this:
> 
> outputs = { 'ospf' : { '1' : lines_of_file[], '2' : lines of_file[]}
> }
> 
> Below is the code I have used to try and achieve the above. I just
> don't get the nested dictionary effect I am after. Again, I am
> trying to use standard core which some of the examples I have seen
> appeared to use. I am aware of collection module.
> 
> #! /usr/bin/env python
> 
> # Identifying if memory leaks are occurring.
> # goal is to import output to Excel.
> # created on 28 Dec 2013 By Sean Murphy
> 
> import os, sys
> from os.path import exists
> 
> # main code begins
> 
> if len(sys.argv) >= 2:
>     # storing file names into variable from command line.
>     filenames = sys.argv[1:]
> else:
>     filenames = os.listdir(os.getcwd())
> #    print ("Error, must provide at least one file name\n")
> #    quit()
> 
> outputs = {} # empty dictionary (hash)
> capture = "" # key used for the capture version
> command = "" # key for the command output
> 
> for filename in filenames:
>     if exists(filename):
>         fp = open(filename, "r")
>         capture = filename[6]
>         command = filename[8:]
>         # nested dictionary. Command and then number of captures.
>         outputs = {command : { capture :[fp.readlines() } }
>         fp.close()
>     else:
>         print ("error %s doesn't exists\n" % filename)
>         quit()
> 
> print ("%r\n" % outputs.keys())
> for key in sorted(outputs):
>     print (outputs[key].keys ())
> 
> 
> Cheers
> Sean

outputs keeps track of the last loop only because you're assigning a new dict on every loop. You need to update the current dict instead.

try to replace
outputs = {command : { capture :fp.readlines() } }

with (untested code)

if command not in outputs:
  outputs[command] = {}
outputs[command][capture] = fp.readlines()

JM


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