esp8266 micropython ds18b20

from machine import Pin
import time, ds18x20
import onewire
ow = onewire.OneWire(Pin(4)) # create a OneWire bus on GPIO12
ds = ds18x20.DS18X20(ow)
roms = ds.scan()
for rom in roms:

Here is what the above code is Doing:
1. Importing the required libraries.
2. Creating a OneWire bus on GPIO4.
3. Creating a DS18X20 object.
4. Scanning for DS18X20 sensors.
5. Converting the temperature readings.
6. Reading the temperature readings.
7. Printing the temperature readings.