CircuitPython OLED text on a Pico

# CircuitPython on a Raspberry Pi Pico: text on an SSD1306 OLED.
# I2C0 on GP5 (SCL) and GP4 (SDA). displayio draws a label with the built-in
# terminalio font; adafruit_displayio_ssd1306 and adafruit_display_text go
# into lib/ for you.
import board
import busio
import displayio
import i2cdisplaybus
import terminalio
import time
import adafruit_displayio_ssd1306
from adafruit_display_text import label

displayio.release_displays()
i2c = busio.I2C(board.GP5, board.GP4)
bus = i2cdisplaybus.I2CDisplayBus(i2c, device_address=0x3C)
display = adafruit_displayio_ssd1306.SSD1306(bus, width=128, height=64)

group = displayio.Group()
title = label.Label(terminalio.FONT, text="Hello, Pico!", x=4, y=8)
counter = label.Label(terminalio.FONT, text="", x=4, y=32, scale=2)
group.append(title)
group.append(counter)
display.root_group = group

n = 0
while True:
    counter.text = str(n)
    print("count", n)
    n += 1
    time.sleep(1)