When to save

• Saving when: Item create, item delete, list reorder, value change, ``setdefault``, etc.

  # All the following single statement will cause saving
  configs['item'] = 'value'
  configs['options'] = {}
  configs.options['list'] = []
  configs.options.list.append('example')
  configs.options['list'] = []
  configs.options.clear()
  value2 = configs.setdefault('item2', 45)

• Not saving when: Item access, assignment but not changed, etc.

  # All the following single statement will NOT cause saving
  value = configs.item
  configs['item'] = 'value' # The value of 'item' is not changed
  value3 = configs.get('item_not_exists', 'default_value')

Non-blocking saving

By default, Biconfigs use asynchronous saving. You can disable the feature by setting async_write to False

# set "async_write=False" if your want to use synchronous saving
# to ensure your data saved to file in time,
# WARNING: In sync mode, your changes will block the incoming statement
# until the file correctly saved.
configs = Biconfigs('configs.json', async_write=False)

configs['item'] = 'value' # Blocking
# Configure file saved already

# Your code...

High frequency update

Normally, Biconfigs will write the changes to file immediately. But sometime you may want to update values frequently, which will result in a IO bottleneck. So you can use ``with`` statement to prevent auto saving for a while.

with configs:
  for i in range(1000):
    configs['some_key'] = i
# This statement will execute saving process only one time when exiting "with" scope

Reload from file

Simply use reload function to reload from file. Note: reload will discard all present data in Biconfigs-object and loads new ones from file)

configs.reload()

Parsers

Biconfigs use Prettified Json as default parser. You may want to set parser='json' to save as compacted json file.

configs = Biconfigs('configs.json', parser='json')
configs['item'] = 'value'
configs['debug'] = False

configs.json:

{"debug": false, "item": "value"}

Available Parsers

• json: Compact JSON format

• pretty-json: Prettified JSON

• cson: CSON format, refer to CSON

• yaml: YAML format, refer to YAML