module busio has no attribute 'OneWire'

[PabloAndo]

Recently I'm working with some DS18B20 sensors and a raspberry pi zero and I'm getting AttributeError executing the following code:

`import time
import board
from adafruit_onewire.bus import OneWireBus
from adafruit_ds18x20 import DS18X20

ow_bus = OneWireBus(board.D4)
ds18 = DS18X20(ow_bus, ow_bus.scan()[0])

while True:
print('Temperature: {0:0.3f}C'.format(ds18.temperature))
time.sleep(1.0)`

The error I get:
File "test_circuitpython_1.py", line 12, in <module> ow_bus = OneWireBus(board.D4) File "/usr/local/lib/python3.5/dist-packages/adafruit_onewire/bus.py", line 77, in __init__ self._ow = busio.OneWire(pin) AttributeError: module 'busio' has no attribute 'OneWire'

A these are the packages installed on the raspberry pi:

Adafruit-Blinka (1.2.8)
adafruit-circuitpython-ads1x15 (1.0.2)
adafruit-circuitpython-busdevice (2.2.9)
adafruit-circuitpython-ds18x20 (1.1.3)
adafruit-circuitpython-onewire (1.1.2)
adafruit-circuitpython-register (1.7.0)
Adafruit-PlatformDetect (1.0.0)
Adafruit-PureIO (0.2.3)
chardet (2.3.0)
circuitpython-build-tools (1.1.9)
Click (7.0)
cryptography (1.7.1)
idna (2.2)
keyring (10.1)
keyrings.alt (1.3)
pip (9.0.1)
pyasn1 (0.1.9)
pycrypto (2.6.1)
pygobject (3.22.0)
pyserial (3.2.1)
python-apt (1.1.0b5)
pyxdg (0.25)
requests (2.12.4)
rpi-ws281x (4.1.0)
RPi.GPIO (0.6.5)
schedule (0.6.0)
SecretStorage (2.3.1)
semver (2.8.1)
setuptools (40.8.0)
six (1.12.0)
spidev (3.4)
ssh-import-id (5.6)
sysv-ipc (1.0.0)
urllib3 (1.19.1)
wheel (0.29.0)

Any idea why? Thanks a lot!

[ladyada]

yah! we dont support onewire thru blinka - you can use the sysfs 1-wire library system instead (we have no way to access 1-wire data outside the kernel)