Mean requires at least one data point

[pxFIN]

Lately i keep seeing this in the logs.. not sure if this is due to the 15min data ?

Logger: homeassistant.util.logging
Source: util/logging.py:167
First occurred: 5 August 2025 at 14:00:00 (20 occurrences)
Last logged: 07:00:00

Exception in handle_new_hr when dispatching 'nordpool_update_hour': () Traceback (most recent call last): File "/config/custom_components/nordpool/sensor.py", line 462, in handle_new_hr self._update() ~~~~~~~~~~~~^^ File "/config/custom_components/nordpool/sensor.py", line 314, in _update self._off_peak_2 = mean(today[20:]) ~~~~^^^^^^^^^^^^ File "/usr/local/lib/python3.13/statistics.py", line 490, in mean raise StatisticsError('mean requires at least one data point') statistics.StatisticsError: mean requires at least one data point
Exception in handle_new_price when dispatching 'nordpool_update_new_price': () Traceback (most recent call last): File "/config/custom_components/nordpool/sensor.py", line 476, in handle_new_price await self.handle_new_hr() File "/config/custom_components/nordpool/sensor.py", line 462, in handle_new_hr self._update() ~~~~~~~~~~~~^^ File "/config/custom_components/nordpool/sensor.py", line 314, in _update self._off_peak_2 = mean(today[20:]) ~~~~^^^^^^^^^^^^ File "/usr/local/lib/python3.13/statistics.py", line 490, in mean raise StatisticsError('mean requires at least one data point') statistics.StatisticsError: mean requires at least one data point
Exception in handle_new_day when dispatching 'nordpool_update_day': () Traceback (most recent call last): File "/config/custom_components/nordpool/sensor.py", line 445, in handle_new_day await self.handle_new_hr() File "/config/custom_components/nordpool/sensor.py", line 462, in handle_new_hr self._update() ~~~~~~~~~~~~^^ File "/config/custom_components/nordpool/sensor.py", line 314, in _update self._off_peak_2 = mean(today[20:]) ~~~~^^^^^^^^^^^^ File "/usr/local/lib/python3.13/statistics.py", line 490, in mean raise StatisticsError('mean requires at least one data point') statistics.StatisticsError: mean requires at least one data point

[Hellowlol]

Have you seen this since?

[pxFIN]

Have you seen this since?

No i havent seen it for sometime now although i cant remember exactly when it vanished from the logs.. i will close this

[jtagcat]

I have it every 15 min in the logs.

2025-12-31 05:00:00.279 ERROR (MainThread) [homeassistant.util.logging] Exception in handle_new_hr when dispatching 'nordpool_update_hour': ()
Traceback (most recent call last):                                                                                                                 
  File "/config/custom_components/nordpool/sensor.py", line 466, in handle_new_hr                                                                  
    self._update()                                                       
    ~~~~~~~~~~~~^^                                                                                                                                 
  File "/config/custom_components/nordpool/sensor.py", line 318, in _update                                                                        
    self._off_peak_2 = mean(today[20:])                                                                                                            
                       ~~~~^^^^^^^^^^^^                                  
  File "/usr/local/lib/python3.13/statistics.py", line 490, in mean                                                                                
    raise StatisticsError('mean requires at least one data point')                                                                                 
statistics.StatisticsError: mean requires at least one data point  

I'm investigating breakage with 0.0.18. The sensor (working on 0.0.17, even showing 15min on apexcharts) with 49 lines of additional_costs does not appear after the update.

  - platform: nordpool
    # Country/region to get the energy prices for. 
    region: "EE"
    
    # Add VAT to base price (not additional_costs!)
    VAT: True
   
    precision: 3
    currency: EUR

    # Percentage of average price to set the low price attribute
    # low_price = hour_price < average * low_price_cutoff
    low_price_cutoff: 0.95
   
    # Display price in cents in stead of (for example) Euros.
    price_in_cents: false
   
    # Price displayed for MWh, kWh or Wh
    price_type: kWh

    # Template to specify additional cost to be added to the tariff.
    # The template price is in EUR, DKK, NOK or SEK (not in cents).
    # For example: "{{ current_price * 0.19 + 0.023 | float}}" 
    #
    # https://elektrilevi.ee/et/vorguleping/vorgupaketid
    # adopted from https://github.com/custom-components/nordpool/discussions/323
    additional_costs: >
      {% macro calculate_price(price, dt) %}

      {% set s = {
          "day": 0.0741,
          "night": 0.0428,
          "vat": 1.24,
          "aktsiis": 0.00145,
          "taastuvenergia": 0.0105,
      } %}

      {% set holidays = [
        '-01-01',
        '-02-24',
        '-04-10',
        '-04-12',
        '-05-01',
        '-05-31',
        '-06-23',
        '-06-24',
        '-08-20',
        '-12-24',
        '-12-25',
        '-12-26',
      ] %}

      {% set is_working_day = dt.isoweekday() < 6 and dt.strftime('-%m-%d') not in holidays %}
      {% set is_peak_price_period = False %} {# dt.month >= 11 or dt.month <= 3 #}

      {% set transfer_price = s.night %}

      {% if is_working_day %}
        {% if is_peak_price_period and (9 <= dt.hour < 12 or 16 <= dt.hour < 20) %}
          {% set transfer_price = s.day_peak %}

        {% elif 7 <= dt.hour < 22 %}
          {% set transfer_price = s.day %}
        {% endif %}

      {% elif is_peak_price_period and 16 <= dt.hour < 20 %}
        {% set transfer_price = s.weekend_peak %}
      {% endif %}

      {% if price is none %}
        {{ none }}
      {% else %}
        {{ (transfer_price) * s.vat + s.aktsiis + s.taastuvenergia }}
      {% endif %}

      {% endmacro %}   
      {{ calculate_price(current_price, now()) | float }}

[jtagcat]

The breakage with 0.0.18 was caused by #416, VAT updated half a year later than it should've. This is the second time inflexible unique_id breaking the integration. Sucks I lose the history every time, the Groups helper (use last updated) doesn't pass attributes either.