Re: [PLUG] Python nested dict data structure

[JP Vossen 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.

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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