save dictionary for later use?

[globalrev]

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.

[jay graves]

On May 16, 2:17 pm, globalrev <skanem...@yaho o.sewrote:

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

[globalrev]

On 16 Maj, 21:22, jay graves <jaywgra...@gma il.comwrote:

On May 16, 2:17 pm, globalrev <skanem...@yaho o.sewrote:

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)

[jay graves]

On May 16, 3:24 pm, globalrev <skanem...@yaho o.sewrote:

On 16 Maj, 21:22, jay graves <jaywgra...@gma il.comwrote:

On May 16, 2:17 pm, globalrev <skanem...@yaho o.sewrote:

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

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)

It's best to post a minimal set of code that exhibits your error.
You aren't saving the output of pickle.dumps and you are using
pickle.load instead of pickle.loads.

Sample loading to and from a string which you can tuck away in a file.

>>import pickle
test = {'a':1,'b':2}
picklestr = pickle.dumps(te st)
test2 = pickle.loads(pi cklestr)
test == test2

True

>>>

Sample using an open file.

>>import pickle
test = {'a':1,'b':2}
pfile = open('pickletes t','wb')
pickle.dump(t est,pfile)
pfile.close ()
pfile = open('pickletes t','rb')
test2 = pickle.load(pfi le)
pfile.close ()
test == test2

True

>>>

....
Jay Graves

[Hans Nowak]

globalrev wrote:

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)

The 'loads' and 'dumps' methods use strings:

>>import pickle
d = {"this": 42, "that": 101, "other": 17}
s = pickle.dumps(d)
s

"(dp0\nS'this'\ np1\nI42\nsS'ot her'\np2\nI17\n sS'that'\np3\nI 101\ns."

>>pickle.loads( s)

{'this': 42, 'other': 17, 'that': 101}

If you want to store to / restore from file, use 'dump' and 'load':

# write to file 'out'...

>>f = open("out")
f = open("out", "wb")
pickle.dump(d , f)
f.close()

# restore it later

>>g = open("out", "rb")
e = pickle.load(g)
g.close()
e

{'this': 42, 'other': 17, 'that': 101}

Also see http://docs.python.org/lib/pickle-example.html.

Hope this helps!

--Hans

[castironpi]

On May 16, 4:23*pm, Hans Nowak <zephyrfalcon!N O_SP...@gmail.c om>
wrote:

globalrev wrote:

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)

The 'loads' and 'dumps' methods use strings:

*>>import pickle
*>>d = {"this": 42, "that": 101, "other": 17}
*>>s = pickle.dumps(d)
*>>s
"(dp0\nS'this'\ np1\nI42\nsS'ot her'\np2\nI17\n sS'that'\np3\nI 101\ns."
*>>pickle.loads (s)
{'this': 42, 'other': 17, 'that': 101}

If you want to store to / restore from file, use 'dump' and 'load':

# write to file 'out'...
*>>f = open("out")
*>>f = open("out", "wb")
*>>pickle.dump( d, f)
*>>f.close()

# restore it later
*>>g = open("out", "rb")
*>>e = pickle.load(g)
*>>g.close()
*>>e
{'this': 42, 'other': 17, 'that': 101}

Also seehttp://docs.python.org/lib/pickle-example.html.

Hope this helps!

--Hans

I want to compare that cleanliness with other languages to compare
formats.

Is pickle.load( open( 'out', 'rb' ) ) any better or worse than
pickle.load( 'out', 'rb' )?

[castironpi]

On May 17, 3:52*am, castironpi <castiro...@gma il.comwrote:

On May 16, 4:23*pm, Hans Nowak <zephyrfalcon!N O_SP...@gmail.c om>
wrote:

globalrev wrote:

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)

The 'loads' and 'dumps' methods use strings:

*>>import pickle
*>>d = {"this": 42, "that": 101, "other": 17}
*>>s = pickle.dumps(d)
*>>s
"(dp0\nS'this'\ np1\nI42\nsS'ot her'\np2\nI17\n sS'that'\np3\nI 101\ns."
*>>pickle.loads (s)
{'this': 42, 'other': 17, 'that': 101}

If you want to store to / restore from file, use 'dump' and 'load':

# write to file 'out'...
*>>f = open("out")
*>>f = open("out", "wb")
*>>pickle.dump( d, f)
*>>f.close()

# restore it later
*>>g = open("out", "rb")
*>>e = pickle.load(g)
*>>g.close()
*>>e
{'this': 42, 'other': 17, 'that': 101}

Also seehttp://docs.python.org/lib/pickle-example.html.

Hope this helps!

--Hans

I want to compare that cleanliness with other languages to compare
formats.

Is pickle.load( open( 'out', 'rb' ) ) any better or worse than
pickle.load( 'out', 'rb' )?- Hide quoted text -

- Show quoted text -

This is a check-in on live-time writing. pickle.load didn't take two
parameters.