[Python-es] Expresiones regulares

[Flavio Danesse]

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, <gustavo en 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
> > marodal en gmail.com
> > _______________________________________________
> > Python-es mailing list
> > Python-es en python.org
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> > FAQ: http://python-es-faq.wikidot.com/
> >
>
>
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