Get values of mixed python tuple/struct

Question

I'm using Python 2.7 to convert saved tuples to list/dictionaries.

Currently my code looks like this:

mystring = "\x80\x02]q\x01(J\x03\x00\x01\x00J\x15\xf93PK\x01K\x01G@\x834\x00\x00\x00\x00\x00K\x01K\x00e}q\x02(M\x03\xbb]q\x03(U\x0bmteststringq\x04Ml0U\x05_L-A_q\x05K\x00K\x02eJ\x06M\xd1\x1d]q\x06(U\x08otherstrq"
mystruct = str(len(mystring)) + 'B'
mydict = struct.unpack(mystruct, mystring)

In reality the string is longer, I shortened it. This works for the integer values, but it contains also names like "mteststring" or "otherstr" - how do I get them out of the string along with their values?

What you are doing is unpacking it as a bunch of bytes, you need to define the structure. — quantum
– quantum, Commented Aug 22, 2012 at 17:06
In order to interpret mystring in a meaningful way, there would have to be a seperator between the elements of the tuple. Otherwise how can you distinguish anything? If you are looking for a way to save and retrieve structured information, have a look at e.g. JSON (json.org), or shelve (docs.python.org/library/shelve.html) if you don't mind that the files are not human readable. — Roland Smith
– Roland Smith, Commented Aug 22, 2012 at 17:15
That is not my data I'm reading, so I cannot define the struct. I'm just trying to analyze it and convert to JSON. — Marius
– Marius, Commented Aug 23, 2012 at 8:50

John Gaines Jr. · Accepted Answer · 2012-08-22 17:43:21Z

1

As xiaomao commented, you'll need to define the full structure in your mystruct string so something like:

mystruct = "47B12s29B9s"
struct.unpack(mystruct, mystring)

gets you a little closer, in that it's extracting the two strings. Of course if you're writing both ends of this transaction, there are many other encoding methods that could be used, including some such as JSON or YAML which will make the data much more readable/portable.

answered Aug 22, 2012 at 17:43

John Gaines Jr.

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1 Comment

Marius Over a year ago

Thats not my data. I'm reading it out from files and converting it to JSON. Reading just integer is no problem at all, just these mixed values are making me headaches.

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