Tuesday, May 19, 2015

RevitLookup and RevitPythonShell

RevitLookup and RevitPythonShell

RevitLookup is a handy tool for interactively exploring Revit BIM databases. If you want to get anywhere with Revit API programming, you should look into RevitLookup. You should also be reading the RevitLookup’s author Jeremy Tammik’s blog The Building Coder!

The standard RevitPythonShell InitScript contains a section dedicated to RevitLookup:

#------------------------------------------------------------------------------
import clr
from Autodesk.Revit.DB import ElementSet, ElementId

class RevitLookup(object):
    def __init__(self, uiApplication):
        '''
        for RevitSnoop to function properly, it needs to be instantiated
        with a reference to the Revit Application object.
        '''
        # find the RevitLookup plugin
        try:
            rlapp = [app for app in uiApplication.LoadedApplications
                     if app.GetType().Namespace == 'RevitLookup'
                     and app.GetType().Name == 'App'][0]
        except IndexError:
            self.RevitLookup = None
            return
        # tell IronPython about the assembly of the RevitLookup plugin
        clr.AddReference(rlapp.GetType().Assembly)
        import RevitLookup
        self.RevitLookup = RevitLookup
        # See note in CollectorExt.cs in the RevitLookup source:
        self.RevitLookup.Snoop.CollectorExts.CollectorExt.m_app = uiApplication
        self.revit = uiApplication

    def lookup(self, element):
        if not self.RevitLookup:
            print 'RevitLookup not installed. Visit https://github.com/jeremytammik/RevitLookup to install.'
            return
        if isinstance(element, int):
            element = self.revit.ActiveUIDocument.Document.GetElement(ElementId(element))
        if isinstance(element, ElementId):
            element = self.revit.ActiveUIDocument.Document.GetElement(element)
        if isinstance(element, list):
            elementSet = ElementSet()
            for e in element:
                elementSet.Insert(e)
            element = elementSet
        form = self.RevitLookup.Snoop.Forms.Objects(element)
        form.ShowDialog()
_revitlookup = RevitLookup(__revit__)
def lookup(element):
    _revitlookup.lookup(element)

#------------------------------------------------------------------------------

What this does is define a global function lookup that will open up the “Snoop Objects” dialog from RevitLookup with the element passed. In fact, you can pass ElementIds, lists of Element objects or just plain integers, that are converted to ElementIds - obtain these from the Manage->IDs of Selection command in the Ribbon. Since the Document also derives from Element, you can inspect it too!

Here are some fun things to try, assuming you haven’t removed anything from the standard InitScript:

Select an element in the BIM, start an interactive Python shell and type:

>>> lookup(selection[0])

You should see something like this:

lookup(selection[0])

If you don’t have RevitLookup installed, you will instead get a message like this:

lookup(selection[0]) - not installed

Typing

>>> lookup(1157058) # make sure this is a valid ElementId!

will result in something like this:

lookup(selection[0]) - not installed

Friday, March 20, 2015

The RevitPythonShell moved to GitHub

The RevitPythonShell has moved to GitHub! You can find the project here: https://github.com/architecture-building-systems/revitpythonshell

Google Code is shutting down so I moved the code to GitHub. I’m currently working on fixing / creating the wiki pages, but you should be able to download the latest release already.

Thursday, March 19, 2015

More control over the RibbonPanel in RevitPythonShell

This post explains how to exert more control over the items shown in the RibbonPanel by your RevitPythonShell scripts.

The default behaviour of RevitPythonShell for external scripts is to group them into split buttons and place the remaining scripts in stacks of up to three. External scripts that are assigned the same “Group” value are placed together in a split button - in the example below, the external scripts “Button five”, “Button six” and “Button seven” are all assigned the group value “Group 5-7”.

Configuring external scripts

After saving your changes, you need to restart Revit to see any changes. The Ribbon will then include this panel:

External scripts in Ribbon panel

This is fine for collecting your personal scripts and while developing new scripts. When it comes to publishing a plugin (even inside your organization) you might want more control of how the buttons appear.

NOTE: When you create a RpsAddin for deployment, you use a slightly different approach by specifying the buttons in the RpsAddin xml file. But you are still limited to PushButtons.

The Revit API contains a selection of controls you can use to execute scripts that you can use instead. You can find out all about these in the Revit API Developers Guide (Ribbon Panels and Controls).

The Revit API expects you to build your Ribbon panels and controls while the application is starting up - during the IExternalApplication.OnStartup method of a plugin. After that, the access to the UIControlledApplication which is needed to alter the Ribbon is not available anymore. Therefore, you can only access the UIControlledApplication object in the RPS startup script - through a special variable called __uiControlledApplication__. The startup script in RPS gives you access to the very variable it uses to configure its own user interface. All we need to do now is hook up an RPS script with a button on the ribbon. Let us assume a very simple script:

"""
helloworld.py - prints a greeting
"""
print 'hello, world!'

(you can find this script in the rps-sample-scripts project on GitHub)

This script shall be called whenever the user clicks a button or other control on our custom Ribbon panel.

There is just one problem here. When you create a control on a Revit Ribbon panel, you need to pass in the path to a DLL and the fully qualified name (including namespaces) of a class inside that DLL that implements IExternalCommand. That does not sound like a python script at all!

To support this, the RevitPythonShell exposes a special class called ExternalCommandAssemblyBuilder which can create such a DLL. To use it, you just pass in a dictionary of class names and the corresponding python script files. The DLL created is just a very thin wrapper that calls into the RpsRuntime.dll (yes, that means you can use this for your RpsAddins!) with the script path and gets them executed.

So, a simple startup script that creates a Ribbon panel with a single PushButton would look like this:

'''
simple_ribbon.py - creates a ribbon panel with a single push button.

NOTE:
    - this MUST be set as a startup script for it to work
    - the RPS variable "EXAMPLES_PATH" must be set and contain "helloworld.py"
'''

# script that is run when Revit starts in the IExternalApplication.Startup event.
try:
    import os
    from RevitPythonShell.RpsRuntime import ExternalCommandAssemblyBuilder
    from Autodesk.Revit.UI import *

    SCRIPT_PATH = os.path.join(__vars__['EXAMPLES_PATH'], "helloworld.py")
    DLL_PATH = os.path.expandvars(r"%APPDATA%\RevitPythonShell2015\simple_ribbon.dll")
    print 'storing external command assembly here:', DLL_PATH

    builder = ExternalCommandAssemblyBuilder()
    builder.BuildExternalCommandAssembly(
        DLL_PATH,
        {'HelloWorld': SCRIPT_PATH})

    panel = __uiControlledApplication__.CreateRibbonPanel('simple_ribbon')

    pbd = PushButtonData('pb_HelloWorld', 'hello, world!', DLL_PATH, 'HelloWorld')
    panel.AddItem(pbd)

    #__window__.Close()  # closes the window
except:
    import traceback       # note: add a python27 library to your search path first!
    traceback.print_exc()  # helps you debug when things go wrong

(NOTE: you can find this script in the rps-sample-scripts repository on GitHub)

The script (and all following scripts in this post) assumes you have the directory structure of the rps-sample-scripts repository downloaded to your machine - a simple git clone should do the trick - and have set the RPS variable EXAMPLES_PATH to point to that folder. You could also just edit the script text to hard code the paths and live with the nasty code smell…

Adding simple_ribbon.py as your startup script will result in a new ribbon panel added to RPS:

simple_ribbon.py output

When clicked, you will be greeted as expected.

There are a few things going on here, so let’s go through them one by one. First, the whole body of the script is wrapped in a try/except. This is important, since a crash in the script might bring down the whole of Revit and you will not know where it happened - so we use traceback.print_exc() to print an exception trace. This is a handy debugging tip for your RPS scripting skill set!

Next, we create an assembly for Revit to load when you click the push button. The arguments to builder.BuildExternalCommandAssembly include the path of the assembly to be created. I chose to place it in the same folder as the CommandLoaderAssembly.dll - which is a similar dll created by RPS for the external scripts defined in the Configure dialog. You can place it anywhere the script has write access to.

Adding a panel to the ribbon and adding a push button to the panel is basically just an exercise of translating the sample c# code from the SDK into python. Adding images is also possible. Consider the following revised version:

% simple_ribbon_with_icons.py (includes images)

This produces a Ribbon panel that looks like this:

simple ribbon with icon

As far as I can tell, you only really need to set the LargeImage property of the PushButtonData object - the Image property seems to be an atavism from an ancient version of Revit…

The rps-sample-scripts repository on GitHub contains a translation of the New Ribbon Panel example from the Revit API Developer’s Guide:

"""
new_ribbon_panel.py - a startup script to create a selection of
controls on the ribbon.

This script is based on the New Ribbon Panel and Controls example in the
Revit API Devolopers Guide.

NOTE:
    - this MUST be set as a startup script for it to work
    - the RPS variable "EXAMPLES_PATH" must be set and contain "helloworld.py"
"""

import os
import clr
clr.AddReference('PresentationCore')
from System.Windows.Media.Imaging import BitmapImage
from System import Uri
from RevitPythonShell.RpsRuntime import ExternalCommandAssemblyBuilder
from Autodesk.Revit.UI import *

SCRIPT_PATH = os.path.join(__vars__['EXAMPLES_PATH'], "helloworld.py")
LARGE_IMG_PATH = os.path.join(__vars__['EXAMPLES_PATH'], "PythonScript32x32.png")
SMALL_IMG_PATH = os.path.join(__vars__['EXAMPLES_PATH'], "PythonScript16x16.png")
EXAMPLES_PATH = __vars__['EXAMPLES_PATH']
DLL_PATH = os.path.expandvars(r"%APPDATA%\RevitPythonShell2015\simple_ribbon.dll")
print 'storing external command assembly here:', DLL_PATH


def create_ribbon_panel():
    panel = __uiControlledApplication__.CreateRibbonPanel("New Ribbon Panel")
    add_radio_group(panel)
    panel.AddSeparator()
    add_push_button(panel)
    panel.AddSeparator()
    add_split_button(panel)
    panel.AddSeparator()
    add_stacked_buttons(panel)
    panel.AddSeparator()
    add_slide_out(panel)


def add_radio_group(panel):
    """add radio button group"""
    radio_data = RadioButtonGroupData("radioGroup")
    radio_button_group = panel.AddItem(radio_data)

    tb1 = ToggleButtonData("toggleButton1", "Red")
    tb1.ToolTip = "Red Option"
    tb1.LargeImage = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'red.png')))

    tb2 = ToggleButtonData("toggleButton2", "Green")
    tb2.ToolTip = "Green Option"
    tb2.LargeImage = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'green.png')))

    tb3 = ToggleButtonData("toggleButton3", "Blue")
    tb3.ToolTip = "Blue Option"
    tb3.LargeImage = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'blue.png')))

    radio_button_group.AddItem(tb1)
    radio_button_group.AddItem(tb2)
    radio_button_group.AddItem(tb3)


def add_push_button(panel):
    """add push button"""
    push_button = panel.AddItem(
        PushButtonData("pb_HelloWorld", "Hello, world!",
                       DLL_PATH, "HelloWorld"))
    push_button.ToolTip = "Say hello world"
    context_help = ContextualHelp(ContextualHelpType.Url, "http://www.autodesk.com")
    push_button.SetContextualHelp(context_help)

    push_button.LargeImage = BitmapImage(Uri(LARGE_IMG_PATH))


def add_split_button(panel):
    """add a split button"""
    button_one = PushButtonData("pbButtonOne", "Option one",
                                DLL_PATH, "HelloWorld")
    button_one.LargeImage = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'one.png')))

    button_two = PushButtonData("pbButtonTwo", "Option two",
                                DLL_PATH, "HelloWorld")
    button_two.LargeImage = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'two.png')))

    button_three = PushButtonData("pbButtonThree", "Option three",
                                DLL_PATH, "HelloWorld")
    button_three.LargeImage = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'three.png')))

    split_button = panel.AddItem(SplitButtonData("splitButton", "Split"))
    split_button.AddPushButton(button_one)
    split_button.AddPushButton(button_two)
    split_button.AddPushButton(button_three)


def add_stacked_buttons(panel):
    """Add a text box and combo box as stacked items"""
    combo_box_data = ComboBoxData("comboBox")
    text_data = TextBoxData("Text Box")
    text_data.Image = BitmapImage(Uri(SMALL_IMG_PATH))
    text_data.Name = "Text Box"
    text_data.ToolTip = "Enter some text here"
    text_data.LongDescription = """This is text that will appear next to the image
        when the user hovers the mouse over the control"""
    text_data.ToolTipImage = BitmapImage(Uri(LARGE_IMG_PATH))

    stacked_items = panel.AddStackedItems(text_data, combo_box_data)

    text_box = stacked_items[0]
    text_box.PromptText = "Enter a comment"
    text_box.ShowImageAsButton = True
    text_box.ToolTip = "Enter some text"
    text_box.EnterPressed += lambda sender, args: TaskDialog.Show('new_ribbon_panel', sender.Value)

    combo_box = stacked_items[1]
    combo_box.ItemText = "ComboBox"
    combo_box.ToolTip = "Select an Option"
    combo_box.LongDescription = "Select a number or letter"

    member_data_a = ComboBoxMemberData('A', 'Option A')
    member_data_a.Image = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'a.png')))
    member_data_a.GroupName = 'Letters'
    combo_box.AddItem(member_data_a)

    member_data_b = ComboBoxMemberData('B', 'Option B')
    member_data_b.Image = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'b.png')))
    member_data_b.GroupName = 'Letters'
    combo_box.AddItem(member_data_b)

    member_data_c = ComboBoxMemberData('C', 'Option C')
    member_data_c.Image = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'c.png')))
    member_data_c.GroupName = 'Letters'
    combo_box.AddItem(member_data_c)

    member_data_1 = ComboBoxMemberData('1', 'Option 1')
    member_data_1.Image = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'one_small.png')))
    member_data_1.GroupName = 'Numbers'
    combo_box.AddItem(member_data_1)

    member_data_2 = ComboBoxMemberData('2', 'Option 2')
    member_data_2.Image = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'two_small.png')))
    member_data_2.GroupName = 'Numbers'
    combo_box.AddItem(member_data_2)

    member_data_3 = ComboBoxMemberData('3', 'Option 3')
    member_data_3.Image = BitmapImage(Uri(os.path.join(
        EXAMPLES_PATH, 'StartupScripts', 'three_small.png')))
    member_data_3.GroupName = 'Numbers'
    combo_box.AddItem(member_data_3)

def add_slide_out(panel):
    pass  # left as exercise for the reader :)


if __name__ == '__main__':
    try:
        builder = ExternalCommandAssemblyBuilder()
        builder.BuildExternalCommandAssembly(
            DLL_PATH,
            {'HelloWorld': SCRIPT_PATH})
        create_ribbon_panel()
    except:
        import traceback
        traceback.print_exc()

If you are really interested on what is produced by the ExternalCommandAssemblyBuilder, just use JetBrains dotPeek to decompile the simple_ribbon.dll. When I tried, I ended up with this:

Disassembled source code of simple_ribbon.py

I’ll leave it as an exercise to the reader to get on GitHub and check out the source for RpsExternalCommandScriptBase - it has a constructor that saves the script path as a member to be called when Revit decides to Execute it.

Friday, February 6, 2015

Batteries included!

The newest versions of the RevitPythonShell include a copy of the python standard library. This copy is taken from IronPython. This means you don’t need to add a search path to a local python distribution when importing standard python modules.

Since the library is included in a zip file embedded in the RpsRuntime.dll, it is also automatically deployed with when creating RpsAddIns.

The versions supporting this feature are:

  • (r223) Installer for Autodesk Revit 2015 (experimental)
  • Installer for Autodesk Vasari (Beta 3)
  • List item

Thursday, January 15, 2015

Introducing the non-modal shell in RevitPythonShell (r223)

You have no idea how excited I am about this release! Revision r223 of the RevitPythonShell has been tested by a select few very brave people (Ehsan Iran Nejad and Callum Freeman) and seems to work. Normally I’m not so worried about pushing out new versions, but this one is… different.
The idea actually came from Ehsan. The Next Big Thing. Also known as the non-modal shell.
I know, I know - I need to get a lot better at coming up with good names for the various parts in RevitPythonShell, but for now, that is what it is called: Non-modal shell.
The non-modal shell is different from the standard RevitPythonShell shell in that it is… well… non-modal. What does that mean? Currently, when you start a shell in RPS, the shell gets the focus and you can’t interact with the rest of the Revit GUI until you close the shell again. This is cool for working with short scripts, trying stuff out etc, but we can do better:
The non-modal shell does not block the rest of Revit. You can select stuff in the view, make changes to the BIM etc. And then query the selection in the shell or do whatever you like.
With some exceptions.
You see, because the shell is non-modal, it is not running in the special thread Revit needs you to be in for accessing the API. You would get a lot of ugly errors, if there wasn’t some clever magic going on in the background that sends all input to the interactive shell to an implementation of IExternalEventHandler which Revit then runs in the correct thread and everything is fine and dandy.
What doesn’t work though, is using transactions in the interactive shell:
>>> t = Transaction(doc, 'test')
>>> t.Start()
Autodesk.Revit.DB.TransactionStatus.Started
>>> t.GetStatus()
Autodesk.Revit.DB.TransactionStatus.RolledBack
>>> t.Commit()
Traceback (most recent call last):
  File "<stdin>", line 1, in <module>
Exception: The transaction has not been started yet (the current status is not 'Started'). A transaction must be started before it can be either committed or rolled back.
>>>
You can get around this by using the IronPython Pad - the little editor below the interactive shell. This allows you to run multiple lines at a time and those will be run in the same IExternalEventHandler so the problem does not show up.
You can find the installer for this (experimental) version of RevitPythonShell in the Downloads section of the project homepage.
I intend to post some more articles in the future that showcase some other new features in the r223 release, so you can expect some more goodies soon :)

Monday, December 22, 2014

A short tutorial on the esoreader module

This post explains how to use the esoreader, a python module for parsing the .eso file produced by EnergyPlus. It also includes a small (incomplete) reverse engineering of the .eso file format.
EnergyPlus is a whole building simulation tool EnergyPlus is a whole building energy simulation program that engineers, architects, and researchers use to model energy and water use in buildings. The .eso file is the main output file produced by EnergyPlus and is normally parsed by tools that come with the EnergyPlus suit of tools. The esoreader module lets you read in the time series data in python scripts, which for my research is quite useful. I published the module thinking other people might want to do so too.
Last week I got an email about how the documentation on the pypi page for the esoreader module is rather… terse. So I went to check the esoreader page and yes, there is not a lot of documentation. The example code I published was this:
import esoreader
PATH_TO_ESO = r'/Path/To/EnergyPlus/Output/eplusout.eso'
dd, data = esoreader.read(PATH_TO_ESO)
frequency, key, variable = dd.find_variable(
    'Zone Ventilation Total Heat Loss Energy')[0]
idx = dd.index[frequency, key, variable]
time_series = data[idx] 
What can I say? There is not much more you can do with esoreader. I think the best way to understand the module is to look at the .eso file format:
The eso file format starts of with a header section called the “data dictionary” (I used the variable dd in the example code for that). The first few lines of a sample eso file look something like this:
Program Version,EnergyPlus-Windows-32 8.1.0.009, YMD=2014.03.20 14:18
1,5,Environment Title[],Latitude[deg],Longitude[deg],Time Zone[],Elevation[m]
2,6,Day of Simulation[],Month[],Day of Month[],DST Indicator[1=yes 0=no],Hour[],StartMinute[],EndMinute[],DayType
3,3,Cumulative Day of Simulation[],Month[],Day of Month[],DST Indicator[1=yes 0=no],DayType  ! When Daily Report Variables Requested
4,2,Cumulative Days of Simulation[],Month[]  ! When Monthly Report Variables Requested
5,1,Cumulative Days of Simulation[] ! When Run Period Report Variables Requested
6,1,DEFAULT_ZONE,Zone Outdoor Air Drybulb Temperature [C] !TimeStep
99,1,DPVWALL:1157026,Surface Outside Face Temperature [C] !TimeStep
100,1,DPVWINDOW:COMBINED:DPVWALL:1157026:DEFAULTWINDOWCONSTRUCTION,Surface Outside Face Temperature [C] !TimeStep
101,1,DPVWALL:1157027,Surface Outside Face Temperature [C] !TimeStep
102,1,DPVWINDOW:COMBINED:DPVWALL:1157027:DEFAULTWINDOWCONSTRUCTION,Surface Outside Face Temperature [C] !TimeStep
103,1,DPVWALL:1157028,Surface Outside Face Temperature [C] !TimeStep
104,1,DPVWINDOW:COMBINED:DPVWALL:1157028:DEFAULTWINDOWCONSTRUCTION,Surface Outside Face Temperature [C] !TimeStep
105,1,DPVWALL:1157029,Surface Outside Face Temperature [C] !TimeStep
106,1,DPVWINDOW:COMBINED:DPVWALL:1157029:DEFAULTWINDOWCONSTRUCTION,Surface Outside Face Temperature [C] !TimeStep
107,1,DPVFLOOR:1157042,Surface Outside Face Temperature [C] !TimeStep
108,1,DPVROOF:1157058.0,Surface Outside Face Temperature [C] !TimeStep
109,1,DPVROOF:1157058.1,Surface Outside Face Temperature [C] !TimeStep
110,1,DPVROOF:1157058.2,Surface Outside Face Temperature [C] !TimeStep
111,1,DPVROOF:1157058.3,Surface Outside Face Temperature [C] !TimeStep
112,1,DEFAULT_ZONE,Zone Mean Air Temperature [C] !TimeStep
278,1,DEFAULT_ZONEZONEHVAC:IDEALLOADSAIRSYSTEM,Zone Ideal Loads Zone Total Heating Energy [J] !TimeStep
279,1,DEFAULT_ZONEZONEHVAC:IDEALLOADSAIRSYSTEM,Zone Ideal Loads Zone Total Cooling Energy [J] !TimeStep
End of Data Dictionary
The first line is stored in the DataDictionary object (dd) as version and timestamp. After that, each line represents a variable being reported. Each such variable has an index, a number of values being reported and then a reporting frequency. Well… the first few lines (indexes 1 through 5) are a bit special and I just discard them. The rest of the data dictionary lines are built like this:
  • index (e.g. 100)
  • column count (is always one as far as I can tell)
  • key (the same variable can be measured for different keys, as per the Output:Variable object in the IDF file)
    (e.g. “DPVWINDOW:COMBINED:DPVWALL:1157026:DEFAULTWINDOWCONSTRUCTION”, a surface name in one of my models)
  • variable name (e.g. “Surface Outisde Face Temperature”)
  • unit (e.g. “C”)
  • reporting frequency (e.g. “TimeStep”)
These get parsed into a DataDictionary object and stored in the attributes variables and index.
variables = dict of ids, int => [reporting_frequency,
                                 key, variable, unit]

index = dict {(key, variable, reporting_frequency) => id)}
here is an example (I’m using the IPython shell, in case you’re wondering about the In [71] line - check it out! it is awesome!!)
In [71]: dd.variables.items()[1]
Out[71]:
(100,
 ['TimeStep',
  'DPVWINDOW:COMBINED:DPVWALL:1157026:DEFAULTWINDOWCONSTRUCTION',
  'Surface Outside Face Temperature',
  'C'])
The DataDictionary object has a method find_variable. Say, you want to find the variable for ‘Zone Mean Air Temperature’:
In [75]: dd.find_variable('Zone Mean Air Temperature')
Out[75]: [('TimeStep', 'DEFAULT_ZONE', 'Zone Mean Air Temperature')]
Notice how the result is a list? If you had looked for surface temperatures instead:
In [76]: dd.find_variable('surface')
Out[76]:
[('TimeStep', 'DPVROOF:1157058.1', 'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVWALL:1157029', 'Surface Outside Face Temperature'),
 ('TimeStep',
  'DPVWINDOW:COMBINED:DPVWALL:1157029:DEFAULTWINDOWCONSTRUCTION',
  'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVWALL:1157028', 'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVROOF:1157058.3', 'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVROOF:1157058.0', 'Surface Outside Face Temperature'),
 ('TimeStep',
  'DPVWINDOW:COMBINED:DPVWALL:1157028:DEFAULTWINDOWCONSTRUCTION',
  'Surface Outside Face Temperature'),
 ('TimeStep',
  'DPVWINDOW:COMBINED:DPVWALL:1157026:DEFAULTWINDOWCONSTRUCTION',
  'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVWALL:1157027', 'Surface Outside Face Temperature'),
 ('TimeStep',
  'DPVWINDOW:COMBINED:DPVWALL:1157027:DEFAULTWINDOWCONSTRUCTION',
  'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVFLOOR:1157042', 'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVWALL:1157026', 'Surface Outside Face Temperature'),
 ('TimeStep', 'DPVROOF:1157058.2', 'Surface Outside Face Temperature')]
you’d have gotten a list of all variables that match ‘surface’ (case-insensitive, substring match). The tuples define the variable you’re looking for: Frequency, key and variable name, since you can have the same variable output for different frequencies and keys!
So the index of the variable we’re looking for (Zone Mean Air Temperature) can be found like this:
In [77]: dd.index['TimeStep', 'DEFAULT_ZONE', 'Zone Mean Air Temperature']
Out[77]: 112
When you parse an .eso file, you get two values back: The DataDictionary and the data itself, which is stored in a simple dictionary mapping the variable index to the timeseries data:
In [82]: dd, data = esoreader.read('RevitToCitySim_fmibeta.eso')

In [84]: data[112]
Out[84]:
[19.9999999999999,
 20.0,
 20.0,
 20.0,
 20.0,
 20.0,
 20.0,
Where does that data come from? From the rest of the .eso file, which looks like this:
1,Zuerich-SMA - - TMY2-66600 WMO#=,  47.38,   8.57,   1.00, 556.00
2,1, 1, 1, 0, 1, 0.00,60.00,Tuesday        
6,-9.733141026918536E-003
99,4.22860281958676
100,2.29752216466107
101,4.62549195332972
102,2.48360878690238
103,4.45346228786434
104,2.40363283464546
105,4.29531948374435
106,2.37522804444541
107,18.
108,4.50377052140968
109,4.62335191215081
110,4.38341749556803
111,4.62165617120029
112,19.9999999999999
278,69070426.0448551
279,2.200249582529068E-006
2,1, 1, 1, 0, 2, 0.00,60.00,Tuesday        
6,-20.0097331410269
99,-3.72067959222121
100,-11.9333570144822
101,-3.2185453285921
102,-11.9539672821419
103,-3.21604754356428
104,-11.6999602208759
105,-3.69978393125912
106,-12.1422252778574
107,18.
108,-0.183133489472591
109,0.134352957894094
110,-0.291113509003108
111,9.541793763769267E-002
112,20.
278,12241499.5530833
279,0.0
2,1, 1, 1, 0, 3, 0.00,60.00,Tuesday        
6,-20.0097331410269
99,-8.25275818278861
100,-10.9050845966823
For all the main variables (id > 5) the format is:
  • index
  • value
Thus, the data dictionary is necessary to figure out what variables (with what frequency) are being output.
To sum up the tutorial: The code on the pypi page shows you pretty much all you can do and also all you need to do to retrieve a specific timeseries from an .eso file:
  • read in the eso file to obtain the data dictionary and the data
  • find the key, frequency and variable name you need in the data dictionary (with find_variable) or by guessing from your IDF input
  • retrieve the index of that variable
  • retrieve the time series data using that index