fireworks.utilities package


fireworks.utilities.dict_mods module

fireworks.utilities.dict_mods.apply_mod(modification, obj)

Note that modify makes actual in-place modifications. It does not return a copy.

Modification must be {action_keyword : settings}, where action_keyword is a supported DictMod
A dict to be modified
fireworks.utilities.dict_mods.get_nested_dict(input_dict, key)

fireworks.utilities.fw_serializers module

This module aids in serializing and deserializing objects.

To serialize a FW object, refer to the documentation for the FWSerializable class. To de-serialize an object, refer to the documentation for the FWSerializable class and load_object() method.

  • you can de-serialize explicitly, e.g. FWObject.from_dict() to enforce a FWObject instance as the result
  • you can de-serialize implicitly, e.g. load_object() to search for the correct Class dynamically

The implicit method is especially useful if you don’t know in advance which subclass of a base class your serialization might point to. e.g. if you require some type of Quadrilateral, a serialization from your collaborator might point to a Square, Rhombus, or Rectangle, and you might not know which one in advance...

Some advantages:
  • Robust with regard to code refactorings even in implicit loading given certain reasonable guidelines on fw_name.
  • Simple to allow a superclass to define all the serializations for its subclasses, removing code repetition

(in particular, note that from_dict is a class method rather than a static method, allowing use of self) - Decorators aid in some of the routine parts of the serialization, such as adding the _fw_name key - Both JSON and YAML file import/export are naturally and concisely supported within the framework. - Auto-detect and proper loading of JSON and YAML files - Proper JSON handling of datetime (both encoding and decoding) and UTF-8 strings - In some cases, objects can be serialized/deserialized extremely concisely, by use of only their fw_name (if no parameters are needed to describe the object)

class fireworks.utilities.fw_serializers.FWSerializable

Bases: object

To create a serializable object within FireWorks, you should subclass this class and implement the to_dict() and from_dict() methods.

If you want the load_object() implicit de-serialization to work, you must also:

  • Use the @serialize_fw decorator on to_dict()
  • Override the _fw_name parameter with a unique key.

See documentation of load_object() for more details.

The use of @classmethod for from_dict allows you to define a superclass that implements the to_dict() and from_dict() for all its subclasses.

For an example of serialization, see the class QueueAdapterBase.

classmethod from_dict(m_dict)
classmethod from_file(filename, f_format=None)

Load a serialization of this object from a file :param filename: filename to read :param f_format: serialization format, default checks the filename extension

classmethod from_format(f_str, f_format=u'json')

convert from a String representation to its Object :param f_str: the String representation :param f_format: serialization format of the String (default json)

to_file(filename, f_format=None, **kwargs)

Write a serialization of this object to a file :param filename: filename to write to :param f_format: serialization format, default checks the filename extension

to_format(f_format=u'json', **kwargs)

returns a String representation in the given format :param f_format: the format to output to (default json)


Creates an instantiation of a class based on a dictionary representation. We implicitly determine the Class through introspection along with information in the dictionary.

We search for a class with the _fw_name property equal to obj_dict[‘_fw_name’] If the @module key is set, that module is checked first for a matching class to improve speed of lookup. Afterwards, the modules in the USER_PACKAGES global parameter are checked.

Refactoring class names, module names, etc. will not break object loading as long as:

  1. the _fw_name property is maintained the same AND
  2. the refactored module is kept within USER_PACKAGES

You can get around these limitations if you really want: i) If you want to change the fw_name of an object you can set the FW_NAME_UPDATES key ii) If you want to put a refactored module in a new place add an entry to USER_PACKAGES

Parameters:obj_dict – the dict representation of the class
fireworks.utilities.fw_serializers.load_object_from_file(filename, f_format=None)

Implicitly load an object from a file. just a friendly wrapper to load_object()

  • filename – the filename to load an object from
  • f_format – the serialization format (default is auto-detect based on filename extension)

a decorator to add FW serializations keys see documentation of FWSerializable for more details

fireworks.utilities.fw_serializers.recursive_dict(obj, preserve_unicode=True)

a decorator to add FW serializations keys see documentation of FWSerializable for more details


a decorator to add FW serializations keys see documentation of FWSerializable for more details

fireworks.utilities.fw_utilities module

class fireworks.utilities.fw_utilities.DataServer(address=None, authkey=None, serializer='pickle')

Bases: multiprocessing.managers.BaseManager

Provide a server that can host shared objects between multiprocessing Processes (that normally can’t share data). For example, a common LaunchPad is shared between processes and pinging launches is coordinated to limit DB hits.

classmethod setup(launchpad)
Parameters:launchpad – (LaunchPad) object
class fireworks.utilities.fw_utilities.NestedClassGetter

Bases: object

Used to help pickle inner classes, e.g. see Workflow.Links When called with the containing class as the first argument, and the name of the nested class as the second argument, returns an instance of the nested class.

fireworks.utilities.fw_utilities.create_datestamp_dir(root_dir, l_logger, prefix='block_')

Internal method to create a new block or launcher directory. The dir name is based on the time and the FW_BLOCK_FORMAT

  • root_dir – directory to create the new dir in
  • l_logger – the logger to use
  • prefix – the prefix for the new dir, default=”block_
fireworks.utilities.fw_utilities.get_fw_logger(name, l_dir=None, file_levels=('DEBUG', 'ERROR'), stream_level='DEBUG', formatter=<logging.Formatter object at 0x104544d50>, clear_logs=False)

Convenience method to return a logger.

  • name – name of the logger that sets the groups, e.g. ‘group1.set2’
  • l_dir – the directory to put the log file
  • file_levels – iterable describing level(s) to log to file(s). default: (‘DEBUG’, ‘ERROR’)
  • stream_level – level to log to standard output. default: ‘DEBUG’
  • formatter – logging format. default: FW_LOGGING_FORMATTER
  • clear_logs – whether to clear the logger with the same name
fireworks.utilities.fw_utilities.log_exception(m_logger, msgs)

A shortcut wrapper around log_fancy for exceptions

  • m_logger – (logger) The logger object
  • msgs – ([str]) String or iterable of Strings, will be joined by newlines
fireworks.utilities.fw_utilities.log_fancy(m_logger, msgs, log_lvl='info', add_traceback=False)

A wrapper around the logger messages useful for multi-line logs. Helps to group log messages by adding a fancy border around it, which enhances readability of log lines meant to be read as a unit.

  • m_logger – (logger) The logger object
  • log_lvl – (str) The level to log at
  • msgs – ([str]) a String or iterable of Strings
  • add_traceback – (bool) add traceback text, useful when logging exceptions (default False)
fireworks.utilities.fw_utilities.log_multi(m_logger, msg, log_lvl='info')
  • m_logger – (logger) The logger object
  • msg – (str) a String to log
  • log_lvl – (str) The level to log at

fireworks.utilities.timing module

class fireworks.utilities.timing.NullTimer

Bases: fireworks.utilities.timing.Timer

Support performance timer interface, but do absolutely nothing. This is useful to avoid many tiresome if/else blocks.

class fireworks.utilities.timing.Timer(name)

Bases: object

Simple performance timer.


p = Timer(“myname”) for thing in all_things:

p.start(“stage1”) do_stage_1() p.stop(“stage1”) # alt. ‘with’ interface with p.block(“stage2”):


Limitations: - Instances are not thread-safe. - The set_ns() class method is not thread-safe. - The ‘with’ block() cannot be nested,

instead use different stages with begin()/end() pairs.
  • The only output format is CSV.
  • There is no (easy) programmatic way to get the results.
classmethod set_ns(val)

Set a namespace (prefix) for all timers. In output, the namespace will be separated by the timer name by a ”.”


Begin timing.


Stop timing.


Stop all timers. Idempotent.

write(stream=<open file '<stdout>', mode 'w' at 0x100292150>)

Write results (CSV) to a stream.


Whether any timers are enabled and non-empty

Returns:True if so, False if not
fireworks.utilities.timing.enable_fw_timer(name, is_enabled)

Enable or disable a timer.

Parameters:name – Timer’s name, or glob-style name pattern
Is_enabled:Whether to enable (True) or disable (False)

Get timer, possibly a NullTimer, for a section of code.

If the user did not enable timers for this section, will return a NullTimer. Otherwise will return a Timer.

timer = get_fw_timer(“StarWars”) timer.start(“jumpToLightSpeed”) jumpToLightSpeed() timer.stop(“jumpToLightSpeed”) ... print_fw_timers() # prints results of all timers
Parameters:name (str) – Name of a given timer.
Returns:A timer instance
Return type:Timer
fireworks.utilities.timing.print_fw_timers(stream=<open file '<stdout>', mode 'w' at 0x100292150>)

Print results of all timers to the provided stream.

Parameters:stream – Output stream, only needs to support ‘write’
Returns:number of items (data rows) printed
Return type:int
fireworks.utilities.timing.timer_env_var = u'FW_TIMERS'

Environment variable in which to list the enabled timers Use comma-separated strings, e.g.:

Module contents