Re: [PLUG] Python nested dict data structure

[Gary Duzan via plug <plug@lists.phillylinux.org>]

> Wow, that *would* work like Perl!  But 40+ lines to make it Just Work.
>
> Also, I'm getting an error I don't understand.

   Adding "import numbers" on a line before "class PerlObject:" should do it.

                          Gary Duzan


> Modified code:
> ```
>       1	#!/usr/bin/env python3
>       2	# dict3.py--do I REALLY have to build a CLASS just for NESTED
> dicts!?
>       3	# 2021-07-10
>       4	# From Luke Brooks in EM "Re: [PLUG] Python nested dict data
> structure"
>       5
>       6	class PerlObject:
>       7
>       8	    def __init__(self, value=None):
>       9	        self.Value = value
>      10
>      11	    def __getitem__(self, key):
>      12	        self.checkType(dict)
>      13	        if key not in self.Value:
>      14	            self.Value[key] = PerlObject()
>      15	        return self.Value[key]
>      16
>      17	    def __setitem__(self, key, value):
>      18	        self.checkType(dict)
>      19	        if isinstance(value, PerlObject):
>      20	            self.Value[key] = value
>      21	        else:
>      22	            self.Value[key] = PerlObject(value)
>      23
>      24	    def __delitem__(self, key):
>      25	        self.checkType(dict)
>      26	        if key in self.Value:
>      27	            del self.Value[key]
>      28
>      29	    def __add__(self, other):
>      30	        self.checkType(numbers.Number, 0)
>      31	        if isinstance(other, PerlObject):
>      32	            other.checkType(numbers.Number, 0)
>      33	            return PerlObject(self.Value + other.Value)
>      34	        return PerlObject(self.Value + other)
>      35
>      36	    def checkType(self, t, dfv=None):
>      37	        if self.Value == None:
>      38	            if dfv != None:
>      39	                self.Value = dfv
>      40	            else:
>      41	                self.Value = t()
>      42	        elif not isinstance(self.Value, t):
>      43	            raise Exception("Object does not support operation")
>      44
>      45	    def __repr__(self):
>      46	        return str(self)
>      47
>      48	    def __str__(self):
>      49	        return str(self.Value)
>      50
>      51	d = PerlObject()
>      52
>      53	# Main
>      54	company = 'Acme Inc'  # Key in both (all) files
>      55
>      56	# First read file 1, containing:
> Company\tRegion\tOther-stuff-I-don't-care-about-here
>      57	d.company = 'US'
>      58
>      59	# ...LATER...read file 2, containing *multiple records* of:
> Company\tthis\tthat\Counter
>      60	d[company]['counter'] += 2
>      61	d[company]['counter'] += 3
>      62
>      63	# ...STILL LATER...read file 3, containing even more crazy stuff
>      64	d[company]['subkey']['subsubkey'] = 'foo'
>      65	d[company]['subkey']['subsubint'] += 6
>      66
>      67	print(json.dumps(d, indent=2, sort_keys=True))  # Pretty but
> needs: import json
> ```
>
> Output:
> ```
> $ ./dict3.py
> Traceback (most recent call last):
>    File "./dict3.py", line 60, in <module>
>      d[company]['counter'] += 2
>    File "./dict3.py", line 30, in __add__
>      self.checkType(numbers.Number, 0)
> NameError: name 'numbers' is not defined
> ```
>
>
> On 7/6/21 1:06 PM, Luke Brooks via plug wrote:
>> This little class would do what you want although it's pretty limited in
>> functionality so far since I made it specifically for this example
>>
>>>>> x = PerlObject()
>>>>> company = 'Acme Inc'
>>>>> x[company]['region'] = 'US'
>>>>> x[company]['counter'] += 3
>>>>> x
>
> <snip>
>
> Thanks,
> JP
> --  -------------------------------------------------------------------
> JP Vossen, CISSP | http://www.jpsdomain.org/ | http://bashcookbook.com/
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>


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