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Code Explanation

g_count = 0 # a global variable used to store the pulse count

def count(ev=None): ＃ Define a function to be run when an interrupt happens

global g_count # this function will change the value of the global variable g_count,

thus here we add global before it.

g_count += 1

GPIO.add_event_detect(SigPin, GPIO.RISING, callback=count) # set an interrupt here and

the interrupt signal is a rising edge for Pin Sig. It will run the function count()

accordingly

while True: # wait for the interrupt

print 'g_count = %d' % g_count # print the information

time.sleep(0.001)

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