Domoticz

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--[[ pythonHoliday.lua 
    
    get Holiday string or "None" based on current date.
    
    Before the dzVents script can work the python holidays module needs to be imported on your system.
    Script is tested on dzVents 2.4.7 but will most likely also work on earlier versions
    
    This script use the result string from the python call to determine how to set a user-variable and 
    to update a text device but you can make other choices 
]]--

return {
    on      =   {   timer        = {"at 00:01"}},               -- Once a day right after midnight   
                    
    logging =   {   level     =   domoticz.LOG_ERROR,           -- change to LOG_DEBUG when needed
                    marker    =   "pythonHoliday"    },

    execute = function(dz, _)                           -- dz is short for domoticz; _ because we don't need trigger object
        -- Enter your settings below this line
        local country               = "NL"              --  other country abbreviations to be found at https://pypi.org/project/holidays/
        local holidayVarName        = "Holiday"         -- This var should be defined as type string
        local holidayTextDeviceIDX  =  992              -- This virtual text device should be be defined 
        local none                  = "geen feestdag."  -- Localized text
        
        -- local testDate           = "2018-12-25"      -- Use christmas as a test; uncomment to use this date 
        
        -- Enter your settings above this line
        
        function quote(str)                             -- Add double quotes around string
            return "\""..str.."\""
        end
        
        local mydate  = testDate or os.date('%F')  -- yyyy-MM-DD
        local shellCommand = "echo 'import holidays;holiday=holidays." ..      -- compose shellCommand
                             country ..
                             "(); print (holiday.get(" .. 
                             quote(mydate) .. 
                             "))' | python "
                             
        local filePointer  = io.popen(shellCommand, 'r')                        -- execute command and output to filePointer
        local resultString = filePointer:read('*a'):gsub("\n", "")              -- readvar and remove line break
        filePointer:close()                                                     
        
        dz.log("Return from python call: " .. mydate .. "  " .. resultString,dz.LOG_DEBUG)
        
        -- Just for lay-out purposes
        if resultString == "None" then
           resultString = none
        end   
        
        local fullText = os.date(" %A %d %B, %Y"):gsub(" 0"," ") .. " is " .. resultString 
        if testDate then
            fullText = mydate .. " is " .. resultString 
        end
        
        -- Update textdevice and uservariable
        dz.devices(holidayTextDeviceIDX).updateText(fullText) 
        dz.variables(holidayVarName).set(fullText)
    end
}

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python3

Python 3.6.4 (default, Dec 25 2017, 18:06:53)
[GCC 6.3.0 20170516] on linux
Type "help", "copyright", "credits" or "license" for more information.
>>> import holidays
>>> for date, name in sorted(holidays.Spain(years=2014).items()):
...     print(date, name)
...
2014-01-01 Año nuevo
2014-01-06 Epifanía del Señor
2014-04-18 Viernes Santo
2014-05-01 Día del Trabajador
2014-08-15 Asunción de la Virgen
2014-10-12 Día de la Hispanidad
2014-11-01 Todos los Santos
2014-12-06 Día de la constitución Española
2014-12-08 La Inmaculada Concepción
2014-12-25 Navidad

>>> for date, name in sorted(holidays.Spain(prov="cat", years=2019).items()):
...     print(date, name)
...
2019-01-01 Año nuevo
2019-01-06 Epifanía del Señor
2019-04-18 Jueves Santo
2019-04-19 Viernes Santo
2019-05-01 Día del Trabajador
2019-08-15 Asunción de la Virgen
2019-10-12 Día de la Hispanidad
2019-11-01 Todos los Santos
2019-12-06 Día de la constitución Española
2019-12-08 La Inmaculada Concepción
2019-12-25 Navidad
>>>

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local mydate  = testDate or os.date('%F')  -- yyyy-MM-DD

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-[[ pythonHoliday.lua 
    
    get Holiday string or "None" based on current date.
    
    Before the dzVents script can work the python holidays module needs to be imported on your system.
    Script is tested on dzVents 2.4.7 but will most likely also work on earlier versions
    
    This script use the result string from the python call to determine how to set a user-variable and 
    to update a text device but you can make other choices 
]]