How to enter multiple, similar, dictionaries?

MRAB python at mrabarnett.plus.com
Mon Dec 11 12:57:58 EST 2023


On 2023-12-11 15:57, Chris Green via Python-list wrote:
> Chris Green <cl at isbd.net> wrote:
>> Is there a way to abbreviate the following code somehow?
>> 
>>     lv = {'dev':'bbb', 'input':'1', 'name':'Leisure volts'}
>>     sv = {'dev':'bbb', 'input':'0', 'name':'Starter volts'}
>>     la = {'dev':'bbb', 'input':'2', 'name':'Leisure Amps'}
>>     sa = {'dev':'bbb', 'input':'3', 'name':'Starter Amps'}
>>     bv = {'dev':'adc2', 'input':0, 'name':'BowProp Volts'}
>> 
>> It's effectively a 'table' with columns named 'dev', 'input' and
>> 'name' and I want to access the values of the table using the variable
>> name.
>> 
> Or, more sensibly, make the above into a list (or maybe dictionary)
> of dictionaries:-
> 
> adccfg = [
>      {'abbr':'lv', 'dev':'bbb', 'input':'1', 'name':'Leisure volts'},
>      {'abbr':'sv', 'dev':'bbb', 'input':'0', 'name':'Starter volts'},
>      {'abbr':'la', 'dev':'bbb', 'input':'2', 'name':'Leisure Amps'},
>      {'abbr':'sa', 'dev':'bbb', 'input':'3', 'name':'Starter Amps'},
>      {'abbr':'bv', 'dev':'adc2', 'input':0, 'name':'BowProp Volts'}
> ]
> 
> This pickles nicely, I just want an easy way to enter the data!
> 
>> I could, obviously, store the data in a database (sqlite), I have some
>> similar data in a database already but the above sort of format in
>> Python source is more human readable and accessible.  I'm just looking
>> for a less laborious way of entering it really.
>> 
How about:

keys = ['abbr', 'dev', 'input', 'name']
adccfg = [
     ('lv', 'bbb', '1', 'Leisure volts'),
     ('sv', 'bbb', '0', 'Starter volts'),
     ('la', 'bbb', '2', 'Leisure Amps'),
     ('sa', 'bbb', '3', 'Starter Amps'),
     ('bv', 'adc2', '0', 'BowProp Volts'),
]
adccfg = [dict(zip(keys, row)) for row in adccfg]

or even:

keys = ['abbr', 'dev', 'input', 'name']
adccfg = '''\
lv,bbb,1,Leisure volts
sv,bbb,0,Starter volts
la,bbb,2,Leisure Amps
sa,bbb,3,Starter Amps
bv,adc2,0,BowProp Volts
'''
adccfg = [dict(zip(keys, line.split(','))) for line in adccfg.splitlines()]



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