File "build/bdist.linux-armv7l/egg/Adafruit_DHT/common.py", line 97, in read_retry code example

Example: raise RuntimeError('Error accessing GPIO.') RuntimeError: Error accessing GPIO.

The RPi.GPIO Python module is bundled with Raspbian.

Currently RPi.GPIO has to be run with root priviliges because it accesses /dev/mem. You need root priviliges to access /dev/mem.

So you have to run RPi.GPIO with sudo or similar.