save dictionary for later use?

[bruno.desthuilliers at gmail.com]

On 16 mai, 22:24, globalrev <skanem... at yahoo.se> wrote:
> On 16 Maj, 21:22, jay graves <jaywgra... at gmail.com> wrote:
>
> > On May 16, 2:17 pm, globalrev <skanem... at yahoo.se> wrote:
>
> > > i extract info from one file and put it into a dictionary.
> > > i want to save that dictionary for later use, how do i do that?
> > > might save a list of dictionaries or a list of classobjects too if
> > > there is any difference.
>
> > use the 'pickle' module.http://docs.python.org/lib/module-pickle.html
>
> > ...
> > Jay Graves
>
> pickle.dumps(mg)
> pickle.load(mg)
>
> 'dict' object has no attribute 'readline'
> dumps load(well i dont know but i get no complaint but running load
> generates that error)

What about *READING THAT FUCKING MANUAL* ?

http://docs.python.org/lib/node316.html
"""
dump(obj, file[, protocol])
    Write a pickled representation of obj to the open file object
file. This is equivalent to Pickler(file, protocol).dump(obj).

    If the protocol parameter is omitted, protocol 0 is used. If
protocol is specified as a negative value or HIGHEST_PROTOCOL, the
highest protocol version will be used.

    Changed in version 2.3: Introduced the protocol parameter.

    file must have a write() method that accepts a single string
argument. It can thus be a file object opened for writing, a StringIO
object, or any other custom object that meets this interface.

load(file)
    Read a string from the open file object file and interpret it as a
pickle data stream, reconstructing and returning the original object
hierarchy. This is equivalent to Unpickler(file).load().

    file must have two methods, a read() method that takes an integer
argument, and a readline() method that requires no arguments. Both
methods should return a string. Thus file can be a file object opened
for reading, a StringIO object, or any other custom object that meets
this interface.

    This function automatically determines whether the data stream was
written in binary mode or not.
"""

Example use:

>>> d = dict(a=1, b=2)
>>> f = open("mydict.dat", "w")
>>> pickle.dump(d, f)
>>> f.close()
>>> f = open("mydict.dat")
>>> d2 = pickle.load(f)
>>> f.close()
>>> d2 == d
True
>>> d2
{'a': 1, 'b': 2}
>>>

Now : it's not the first time - in a couple days - that you ask a
question that you wouldn't have asked if you had taken a couple
minutes doing the tutorial and/or reading the doc. This newsgroup is
*very* tolerant (in most other places on usenet, you would have get a
raw RTFM on the first question, and a PLONK on the second), but there
are still limits, and as far as I'm concerned you're not far from
them. So do yourself and the world a favour, read this:
http://catb.org/~esr/faqs/smart-questions.html

and then this:
http://docs.python.org/tut/tut.html

and next time someone points you to a specific module, have mercy and
*read* the doc before posting.

As far as I'm concerned, I won't anwser any of your questions unless
it's obvious that you have followed these advices (but then I'll be
happy to help if I can).