vice.core.dataframe.evolutionary_settings
=========================================

The VICE dataframe: derived class (inherits from elemental_settings)

Stores simulation parameters on an element-by-element basis which may or
may not vary with time.

Allowed Data Types
------------------
* Keys
	- ``str`` [case-insensitive] : elemental symbols
		The symbols of the elements as they appear on the periodic table.

* Values
	- real number
		A constant which does not vary with time.

	- <function>
		Must accept time in Gyr as the only parameter, and return the
		value of this parameter at that time for a given element.

Indexing
--------
- ``str`` [case-insensitive] : elemental symbols
	The symbols of the elements as they appear on the periodic table.

Functions
---------
- keys
- todict

Example Code
------------
>>> import vice
>>> example = vice.singlezone(name = "example", Zin = {})
>>> example.Zin['o'] = 0.002
>>> example.Zin['fe'] = lambda t: 0.001 * (t / 3)

**Signature**: vice.core.dataframe.evolutionary_settings(frame, name)

.. warning:: Users should avoid creating new instances of derived classes
	of the VICE dataframe and instead use the base class. Instances of
	this class are created automatically.

Parameters
----------
frame : ``dict``
	A dictionary from which to construct the dataframe.
name : ``str``
	String denoting a description of the values stored in this dataframe.