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jsonstore

This module provides a class that maps keys and values from a JSON file onto its attributes.

The goal was to provide a convenient way of loading and saving configuration in a familiar human readable format. This is a bit more flexible than the configparser module which is included with Python.

This works is tested and working on Python 2.7+ and Python 3.3+. It will not work on 2.6 or lower, but is expected to work on 3.0-3.2. The tests do not work in 3.2.6 due to mistreating the 💩 when parsing the test code. This is also tested on pypy and pypy3.

Examples

Basics

# by default JsonStore commits on every change unless in a transaction
store = JsonStore('config.json')
store.a_string = "something"
store.a_list = [1, 2, 3]
store.a_dictionary = {
  'dict-list': [{}],
  'ln(2)': 0.69314718056,
  'for-you': u"💐",
}

# you can use […] to set/get/delete string keys
store['some_key'] = "a value"
# the key is split on '.'s and works on dictionaries
del store['a_dictionary.dict-list']
store['a_dictionary.new_value'] = "old value"

# deep copies are made when assigning values
my_list = ['fun']
store.a_list = my_list
assert store.a_list is not my_list

# deep copies are also returned to avoid unsanitary changes being made
store.a_dictionary['new_value'] = "new value"  # won't update the store!
assert store.a_dictionary['new_value'] == "old value"
assert store.a_dictionary is not store.a_dictionary

Transactions

JsonStore objects can be used as context managers to provide transactions which are rolled back in the event of an exception. The transaction model is primitive; you can only nest transactions.

While a store is put into a transaction, it will not save changes to file until all of the transactions have been closed.

from jsonstore import JsonStore

# even with auto_commit=True, the file won't be saved until the last contexts has been closed
with JsonStore('config.json', indent=None, auto_commit=False) as store:
  self.value = 1

# the context manager will roll back changes made if an exception is raised
store = JsonStore('config.json', indent=None)
try:
  with store:
    store.value = "new"
    raise Exception
except Exception:
  pass
# here we see the value that was saved previously
assert store.value == 1

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