CODEWITHSUNDEEP
pythonregexparsing
CarpeNoctem
CarpeNoctem

Reputation: 5660

Python: parsing help needed!

I am trying to retrieve certain fields within a .lua file. Initially I thought I could just split on commas but the second set of curly brackets ruins that. An example:

return { 
    { 6163, 0, "tv", false, {1302}, "ESPN Deportes", "ESPN Deportes es el", nil,"tv","936",nil,"4x3", mediaRestrictions={"m2g" } },
    { 57075, 0, "tv", false, {1302}, "Video Rola", "Video \"Música Para Tus Ojos\", uedes ver.", nil,"tv","948",nil,"4x3", mediaRestrictions={"m2g" } },
    { 717242, 0, "tv", false, {1302,1301,1288}, "Hits", "asdlfj", nil,"cliplinear","6310",nil,"4x3", mediaRestrictions={"m2g" } },
    { 122719, 0, "tv", false, {1302,1301,1288}, "Bombone", "asdf", nil,"tv","74",nil,"4x3", mediaRestrictions={"m2g" } },
}

So I would be looking for the following from the first line: "ESPN Deportes"(6th field), tv(9th), 936(10th)

God help me...or more likely a stackoverflow ninja. (Python)

Updated with solution

Solution as graciously provided by S.Mark:

res = conn.getresponse()
data = res.read()

# Hackisly transform the lua into json
data = re.sub('\w+=', '', data)
data = data.replace("return","")
data = data.replace("{","[").replace("}","]")
data = data.replace("nil","null")
data = data.replace(",]","]")
data = json.loads(data.strip())

Upvotes: 5

Views: 714

Answers (3)

Don
Don

Reputation: 17636

You can try this trick:

  1. remove 'return' from the string
  2. replace { and } with [ and ]
  3. run the eval (or ast.literal_eval, which is safer) on the string to obtain a list of lists
  4. get the elements you want

Upvotes: 1

YOU
YOU

Reputation: 123927

Probably convert to json.

import json

text = r"""return { 
{ 6163, 0, "tv", false, {1302}, "ESPN Deportes", "ESPN Deportes es el", nil,"tv","936",nil,"4x3", mediaRestrictions={"m2g" } },
{ 57075, 0, "tv", false, {1302}, "Video Rola", "Video \"Música Para Tus Ojos\", uedes ver.", nil,"tv","948",nil,"4x3", mediaRestrictions={"m2g" } },
{ 717242, 0, "tv", false, {1302,1301,1288}, "Hits", "asdlfj", nil,"cliplinear","6310",nil,"4x3", mediaRestrictions={"m2g" } },
{ 122719, 0, "tv", false, {1302,1301,1288}, "Bombone", "asdf", nil,"tv","74",nil,"4x3", mediaRestrictions={"m2g" } },
}"""

obj = json.loads(text.replace("return","").replace("mediaRestrictions=","").replace("{","[").replace("}","]").replace("nil","null").replace("\n","").replace(",]","]").strip())

print obj

# [[6163, 0, u'tv', False, [1302], u'ESPN Deportes', u'ESPN Deportes es el', None, u'tv', u'936', None, u'4x3', [u'm2g']], [57075, 0, u'tv', False, [1302], u'Video Rola', u'Video "M\xfasica Para Tus Ojos", uedes ver.', None, u'tv', u'948', None, u'4x3', [u'm2g']], [717242, 0, u'tv', False, [1302, 1301, 1288], u'Hits', u'asdlfj', None, u'cliplinear', u'6310', None, u'4x3', [u'm2g']], [122719, 0, u'tv', False, [1302, 1301, 1288], u'Bombone', u'asdf', None, u'tv', u'74', None, u'4x3', [u'm2g']]]

for x in obj:
  print x[5], x[8], x[9]

#ESPN Deportes tv 936
#Video Rola tv 948
#Hits cliplinear 6310
#Bombone tv 74

Upvotes: 3

James Khoury
James Khoury

Reputation: 22369

I'm not experienced in lua but I'm guessing you're receiving that as a string/file.

Not the best solution:

import json
myvalue = "{ 1,2,3, { 4,5,6}, {7} }"
myvalue = myvalue.replace("{", "[").replace("}", "]")
mylist = json.loads(myvalue)

And then deal with it as a list?

Or if it is a file use json.load instead of json.loads

Upvotes: 1

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