micropython/examples/accellog.py

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# log the accelerometer values to a file, 1 per second
f = open('motion.dat', 'w') # open the file for writing
for i in range(60): # loop 60 times
time = pyb.time() # get the current time
accel = pyb.accel() # get the accelerometer data
# write time and x,y,z values to the file
f.write('{} {} {} {}\n'.format(time, accel[0], accel[1], accel[2]))
pyb.delay(1000) # wait 1000 ms = 1 second
f.close() # close the file