import serial

ser = serial.Serial("COM7", 19200, timeout=0.1)

#def read_until(until):
#	out = ()
#	while 'until' != 'out':
#		out = (ser.read(1000))
#	return out

def read_until(something):
	output = ()
	while something not in output:
		output = (ser.read(124000))
		#print (output)
	return output

print ("__Attente de la réponse du board")
print ((read_until(b'>>')).decode())

ser.write(('933d86ae930c9a5d6d3a334297d9e72852f05c57#cat.txt:finances.csv\r\n').encode())
print ("__Attaque")

print ("__Attente de la réponse après l'attaque")
print (((read_until(b'\r\n\r\n'))).decode())