Python: 需要解析帮助！

Question

我想从一个 .lua 文件中提取某些字段。最开始我以为可以通过逗号来分割，但第二组大括号让这个方法行不通。举个例子：

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" } },
}

所以我想从第一行中找到以下内容： "ESPN Deportes"（第六个字段）、tv（第九个）、936（第十个）

求求上天保佑我……或者更可能是求助于 StackOverflow 的高手们。（Python）

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更新了解决方案

解决方案是由 S.Mark 慷慨提供的：

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())

Answer 1

我对Lua不太熟悉，但我猜你收到的内容是一个字符串或者文件。

这不是最好的解决办法：

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

然后把它当作一个列表来处理吗？

或者如果它是一个文件的话，可以用 json.load，而不是 json.loads。

Answer 2

你可以试试这个方法：

1. 把字符串中的'return'去掉
2. 把{和}替换成[和]
3. 对这个字符串使用eval（或者更安全的ast.literal_eval）来得到一个列表的列表
4. 获取你想要的元素

Answer 3

可能需要转换成json格式。

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