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""" Load or save values to a file.
Shelves work well for storing data, but they are slow to access
repeatedly - especially for large data sets. This module allows
you to store data to a file and then load it back into the workspace.
When the data is stored, a python module is also created as the
"namespace for the data"
>>> import scipy.io
>>> import os
>>> a = 1
>>> scipy.io.save_as_module('c:/temp/junker',{'a':a})
>>> os.chdir('c:/temp')
>>> import junker
>>> junker.a
1
"""
__all__ = ['save_as_module',
# The rest of these are all deprecated
'save', 'create_module',
'create_shelf', 'load']
import dumb_shelve
import os
from numpy import deprecate_with_doc, deprecate
def _load(module):
""" Load data into module from a shelf with
the same name as the module.
"""
dir,filename = os.path.split(module.__file__)
filebase = filename.split('.')[0]
fn = os.path.join(dir, filebase)
f = dumb_shelve.open(fn, "r")
#exec( 'import ' + module.__name__)
for i in f.keys():
exec( 'import ' + module.__name__+ ';' +
module.__name__+'.'+i + '=' + 'f["' + i + '"]')
# print i, 'loaded...'
# print 'done'
load = deprecate_with_doc("""
This is an internal function used with scipy.io.save_as_module
If you are saving arrays into a module, you should think about using
HDF5 or .npz files instead.
""")(_load)
def _create_module(file_name):
""" Create the module file.
"""
if not os.path.exists(file_name+'.py'): # don't clobber existing files
module_name = os.path.split(file_name)[-1]
f = open(file_name+'.py','w')
f.write('import scipy.io.data_store as data_store\n')
f.write('import %s\n' % module_name)
f.write('data_store._load(%s)' % module_name)
f.close()
create_module = deprecate_with_doc("""
This is an internal function used with scipy.io.save_as_module
If you are saving arrays into a module, you should think about
using HDF5 or .npz files instead.
""")(_create_module)
def _create_shelf(file_name,data):
"""Use this to write the data to a new file
"""
shelf_name = file_name.split('.')[0]
f = dumb_shelve.open(shelf_name,'w')
for i in data.keys():
# print 'saving...',i
f[i] = data[i]
# print 'done'
f.close()
create_shelf = deprecate_with_doc("""
This is an internal function used with scipy.io.save_as_module
If you are saving arrays into a module, you should think about using
HDF5 or .npz files instead.
""")(_create_shelf)
def save_as_module(file_name=None,data=None):
""" Save the dictionary "data" into
a module and shelf named save
"""
_create_module(file_name)
_create_shelf(file_name,data)
save = deprecate(save_as_module, 'save', 'save_as_module')
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