old_contents: import datetime
  import sys
  import pigpio
  import time
  import math
  
  time_record = int(time.time() * 1000)
  time_limit = 50
  pi = pigpio.pi()
  sensor_message_size = 7
  sensor_signal_pin = 4
  dead_pin = 17
  pi.set_mode(sensor_signal_pin, pigpio.OUTPUT)
  h1 = pi.serial_open("/dev/ttyAMA0", 9600)
  pi.serial_write_byte(h1, 10 * 2)
  pi.write(sensor_signal_pin, pigpio.LOW)
  print("start")
  try:
      while True:
          while (int(time.time() * 1000) - time_record) <= time_limit:
              time.sleep(0.002)
          time_record = int(time.time() * 1000)
          distance = []
          pi.serial_read(h1)  # clear any redauntancy data
          pi.write(sensor_signal_pin, pigpio.HIGH)
          while pi.serial_data_available(h1) < sensor_message_size - 1:
              # print( pi.serial_data_available(h1))
              time.sleep(0.0007)
          (b, d) = pi.serial_read(h1, sensor_message_size)
          pi.write(sensor_signal_pin, pigpio.LOW)
          sets = []
          for a in d:
              sets.append(int(a) / 2.0)
          if pi.read(dead_pin) == pigpio.LOW:
              print("dead")
  
          if not (abs(sets[2] - sets[1]) > 7 and abs(sets[4] - sets[5]) > 7):
              print("SMALLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLER")
              if abs(sets[2] - sets[1]) > 7:
                  a = sets[1]
                  b = sets[2]
              else:
                  a = sets[7]
                  b = sets[6]
              c = math.sqrt(a ** 2 + b ** 2 - 2 * a * b * math.cos(math.pi * 25 / 180))
              sita = math.acos((b ** 2 + c ** 2 - a ** 2) / (2 * b * c))
              ans = a * math.sin(math.pi - sita) / math.sin(sita - math.pi * 25 / 180)
              sets[3] = round(ans, 1)
  
          print([sets[0], sets[1],
                 sets[2], sets[3],
                 sets[4],
                 sets[5], sets[6]])
          # distance = normalize(distance)
  except KeyboardInterrupt:
      pi.serial_close(h1)
      sys.exit(0)
  
new_contents: import datetime
  import sys
  import pigpio
  import time
  import math
  
  time_record = int(time.time() * 1000)
  time_limit = 50
  pi = pigpio.pi()
  sensor_message_size = 7
  sensor_signal_pin = 4
  dead_pin = 17
  pi.set_mode(sensor_signal_pin, pigpio.OUTPUT)
  h1 = pi.serial_open("/dev/ttyAMA0", 9600)
  pi.serial_write_byte(h1, 10 * 2)
  pi.write(sensor_signal_pin, pigpio.LOW)
  print("start")
  try:
      while True:
          while (int(time.time() * 1000) - time_record) <= time_limit:
              time.sleep(0.002)
          time_record = int(time.time() * 1000)
          distance = []
          pi.serial_read(h1)  # clear any redauntancy data
          pi.write(sensor_signal_pin, pigpio.HIGH)
          while pi.serial_data_available(h1) < sensor_message_size - 1:
              # print( pi.serial_data_available(h1))
              time.sleep(0.0007)
          (b, d) = pi.serial_read(h1, sensor_message_size)
          pi.write(sensor_signal_pin, pigpio.LOW)
          sets = []
          for a in d:
              sets.append(int(a) / 2.0)
          if pi.read(dead_pin) == pigpio.LOW:
              print("dead")
  
          if not (abs(sets[2] - sets[1]) > 7 and abs(sets[4] - sets[5]) > 7):
              print("SMALLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLLER")
              if abs(sets[2] - sets[1]) < 7:
                  a = sets[1]+0.5
                  b = sets[2]
              else:
                  a = sets[5]+0.5
                  b = sets[4]
              c = math.sqrt(a ** 2 + b ** 2 - 2 * a * b * math.cos(math.pi * 25 / 180))
              sita = math.acos((b ** 2 + c ** 2 - a ** 2) / (2 * b * c))
              ans = a * math.sin(math.pi - sita) / math.sin(sita - math.pi * 25 / 180)
              sets[3] = round(ans, 1)
  
          print([sets[0], sets[1], sets[2], sets[3], sets[4], sets[5], sets[6]], sita)
          # distance = normalize(distance)
  except KeyboardInterrupt:
      pi.serial_close(h1)
      sys.exit(0)
  
subject: correct errors