sysfs-gpio.py

import os

class Gpio:
    def __init__( self, gpio, rw=None ):
        if type(gpio) is int:
            # gpio number
            self.path = '/sys/class/gpio/gpio' + str(gpio)
        else:
            # gpio name or path
            self.path = os.path.join( '/dev/gpio', gpio )

        if rw is not None and type(rw) is not bool:
            raise TypeError()

        if rw:
            self._f = open( self.path + '/value', 'r+b', buffering=0 )
        else:
            self._f = open( self.path + '/value', 'rb', buffering=0 )
        self.rw = rw

    @property
    def value( self ):
        return (b'0',b'1').index( os.pread( self._f.fileno(), 1, 0 ) )

    @value.setter
    def value( self, value ):
        if self.rw is None:
            self._f = open( self.path + '/value', 'r+b', buffering=0 )
            self.rw = True

        self._f.write( (b'0',b'1')[ value ] )

## example:

my_input = Gpio('P9_92')
my_output = Gpio('P9_42')

print( my_input.value )
print( my_output.value )
my_output.value = 1