Lo que hago es tomar el string que tienes y guardarlo en un archivo como
texto plano pero luego lo cargo utilizando json con lo cual obtengo un
diccionario python. Para obtener las keys y values del diccionario solo
tienes que hacer diccionario.keys() y diccionario.values() o puedes hacer
también diccionario.items() lo cual te da la pareja key:value.
En todos los casos obtendrás lista de keys, values o items.
Ahora bien, el primer obstáculo está salvado, que era pasar el string a un
diccionario donde tienes parejas key-value.
El segundo obstaculo es hacer recursividad dentro del diccionario para
seguir hacia adentro de la estructura obteniendo los diccionarios internos.
No es tan complicado, puedes comenzar con algo como:
for key in diccionario.keys():
valor = diccionario[key]
. . . lo que quieras con el key y lo que quieras con value aca importa
que tipo de dato es el value, porque por lo que veo tienes listas,
diccionarios, string, etc, utiliza type(valor) para operar sobre ellos
según su tipo.
El 3 de junio de 2014, 17:13, Miguel Angel Rodriguez <maro...@gmail.com>
escribió:
> No entiendo que haces con archivo...
>
> Nunca he programado con json en python.
>
> ¿Como seria a partir de lo que indicas el parseo de los datos? Es decir,
> ¿Como seria el bucle que me iria dando el name y el value?
>
>
>
>
> 2014-06-03 22:08 GMT+02:00 Flavio Danesse <fdane...@gmail.com>:
>
> Voto por lo correcto que sería así:
>>
>> import os
>> import json
>> import codecs
>>
>> text =
>> '{"format":"JSON","result":{"devices":[{"key":"SCGDE1BA:180340320", etc
>> . . .
>>
>> path = "/tmp/x.json"
>>
>> archivo = open(path, "w")
>> archivo.write(text)
>> archivo.close()
>>
>> archivo = codecs.open(path, "r", "utf-8")
>> diccionario = json.JSONDecoder("utf-8").decode(archivo.read())
>>
>>
>> El 3 de junio de 2014, 8:03, <gust...@nodo50.org> escribió:
>>
>> ejecutando esto:
>>>
>>> #!/usr/bin/python3
>>> import re
>>> value_str =
>>>
>>> '{"format":"JSON","result":{"devices":[{"key":"SCGDE1BA:180340320","channels":[{"name":"PF","unit":"","meta":"PF","value":"1.000"},{"name":"P-WSpt","unit":"kW","meta":"P-WSpt","value":"935"},{"name":"Vac","unit":"V","meta":"Vac","value":"217.5"},{"name":"Iac","unit":"A","meta":"Iac","value":"513.8"},{"name":"Pac","unit":"kW","meta":"Pac","value":"335.2"},{"name":"Qac","unit":"kVAr","meta":"Qac","value":"-1.0"},{"name":"Sac","unit":"kVA","meta":"Sac","value":"335.1"},{"name":"Fac","unit":"Hz","meta":"Fac","value":"49.950"},{"name":"ErrNoFirst","unit":"","meta":"ErrNoFirst","value":"0"},{"name":"P-WModFailStt","unit":"","meta":"P-WModFailStt","value":"Off"},{"name":"P-WModStt","unit":"","meta":"P-WModStt","value":"Off"},{"name":"Dsc","unit":"","meta":"Dsc","value":"---"},{"name":"Firmware-9","unit":"","meta":"Firmware-9","value":""},{"name":"Cntry","unit":"","meta":"Cntry","value":"DE1"}
>>>
>>> ,{"name":"Type","unit":"","meta":"Type","value":"SCG"},{"name":"Mode","unit":"","meta":"Mode","value":"Operation"},{"name":"Error","unit":"","meta":"Error","value":"---"}]}]},"version":"1.0"'
>>>
>>> for channel_str in re.findall("\"name\":\"[A-Za-z0-9\-.]+\"",value_str):
>>> for channel_str1 in
>>> re.findall("\"value\":\"[A-Za-z0-9\-.]+\"",value_str):
>>> print ( channel_str + ";" + channel_str1 )
>>>
>>> me da esto:
>>>
>>> "name":"Cntry";"value":"335.2"
>>> "name":"Cntry";"value":"-1.0"
>>> "name":"Cntry";"value":"335.1"
>>> "name":"Cntry";"value":"49.950"
>>> "name":"Cntry";"value":"0"
>>> "name":"Cntry";"value":"Off"
>>> "name":"Cntry";"value":"Off"
>>> "name":"Cntry";"value":"---"
>>> "name":"Cntry";"value":"DE1"
>>> "name":"Cntry";"value":"SCG"
>>> "name":"Cntry";"value":"Operation"
>>> "name":"Cntry";"value":"---"
>>> "name":"Type";"value":"1.000"
>>> "name":"Type";"value":"935"
>>> "name":"Type";"value":"217.5"
>>> "name":"Type";"value":"513.8"
>>> "name":"Type";"value":"335.2"
>>> "name":"Type";"value":"-1.0"
>>> "name":"Type";"value":"335.1"
>>> "name":"Type";"value":"49.950"
>>>
>>>
>>> te vale?
>>>
>>>
>>>
>>>
>>>
>>> > Hola a todos,
>>> >
>>> > Estoy intentando parsear con Python una gran cadena que recibo en un
>>> > software de comunicaciones que estoy programando.
>>> >
>>> > La cadena que yo recibo es la siguiente:
>>> >
>>> > value_str =
>>> >
>>> {"format":"JSON","result":{"devices":[{"key":"SCGDE1BA:180340320","channels":[{"name":"PF","unit":"","meta":"PF","value":"1.000"},{"name":"P-WSpt","unit":"kW","meta":"P-WSpt","value":"935"},
>>> >
>>> >
>>> {"name":"Vac","unit":"V","meta":"Vac","value":"217.5"},{"name":"Iac","unit":"A","meta":"Iac","value":"513.8"},{"name":"Pac","unit":"kW","meta":"Pac","value":"335.2"},{"name":"Qac","unit":"kV
>>> >
>>> >
>>> Ar","meta":"Qac","value":"-1.0"},{"name":"Sac","unit":"kVA","meta":"Sac","value":"335.1"},{"name":"Fac","unit":"Hz","meta":"Fac","value":"49.950"},{"name":"ErrNoFirst","unit":"","meta":"ErrNoFirst","value":"0"},{"
>>> >
>>> >
>>> name":"P-WModFailStt","unit":"","meta":"P-WModFailStt","value":"Off"},{"name":"P-WModStt","unit":"","meta":"P-WModStt","value":"Off"},{"name":"Dsc","unit":"","meta":"Dsc","value":"---"},{"name":"Firmware-9","unit":"","meta":"Firmware-9","value":"
>>> > "},{"name":"Cntry","unit":"","meta":"Cntry","value":"DE1"}
>>> >
>>> ,{"name":"Type","unit":"","meta":"Type","value":"SCG"},{"name":"Mode","unit":"","meta":"Mode","value":"Operation"},{"name":"Error","unit":"","meta":"Error","value":"---"}]}]},"version":"1.0"
>>> >
>>> >
>>> > Yo solo quiero quedarme con los name y value existente.
>>> >
>>> > LA forma en la que lo estoy intentando es la siguiente:
>>> >
>>> > for channel_str in re.findall("\"name\":\"[A-Za-z0-9\-.
>>> > ]+\",\"value\":\"[A-Za-z0-9\-. ]*\"",value_str):
>>> > d_value = re.findall("[A-Za-z0-9.\-]+",channel_str)
>>> >
>>> > Pero de esta forma no entra en el for.
>>> >
>>> > ¿Alguien me puede ayudar?
>>> >
>>> > Gracias y un saludo
>>> >
>>> >
>>> >
>>> >
>>> >
>>> >
>>> > --
>>> > Miguel Ángel Rodríguez de Alba
>>> > 678304435
>>> > maro...@gmail.com
>>> > _______________________________________________
>>> > Python-es mailing list
>>> > Python-es@python.org
>>> > https://mail.python.org/mailman/listinfo/python-es
>>> > FAQ: http://python-es-faq.wikidot.com/
>>> >
>>>
>>>
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>>
>>
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>>
>>
>
>
> --
> Miguel Ángel Rodríguez de Alba
> 678304435
> maro...@gmail.com
>
> _______________________________________________
> Python-es mailing list
> Python-es@python.org
> https://mail.python.org/mailman/listinfo/python-es
> FAQ: http://python-es-faq.wikidot.com/
>
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