input: Write a function to set up GPIO pins, import necessary modules, define operating modes, prompt for password and mode selection, check license validity and user registration, calculate BAC, open solenoid to dispense beer if valid license and BAC below threshold, and record swipe data in appropriate file. The function should return a Boolean value indicating whether the beer was dispensed or not. If the function encounters any errors or conditions where the beer should not be dispensed, it should return False.
  
  
  def dispense_beer_system():
      from time import sleep
      import RPi.GPIO as GPIO
  
      GPIO.setmode(GPIO.BOARD)
      GPIO.setwarnings(False)
  
      GPIO.setup(3, GPIO.OUT)
      GPIO.setup(3, GPIO.LOW)
  
      import time
      timestr = time.strftime("%Y%m%d %H%M%S")
  
      from CheckLicense import check_license, calc_BAC
  
      import getpass
      import sys
      import re
  
      while True:
          mode_req = input("Enter Mode(normal, party, barkeep): ")
  
          if mode_req == "party":
              passwd = getpass.getpass("Enter password: ")
              if passwd == "admin":
                  mode = "party"
  
          if mode_req == "normal":
              passwd = getpass.getpass("Enter password: ")
              if passwd == "admin":
                  mode = "normal"
  
          if mode_req == "barkeep":
              passwd = getpass.getpass("Enter password: ")
              if passwd == "admin":
                  mode = "barkeep"
  
          while mode == 'normal':
              print('{0} mode!'.format(mode))
  
              raw_text = getpass.getpass('Swipe card now:   ').strip()
  
              check_license_out = check_license(raw_text)
  
              valid_license = check_license_out[0]
              first_name = check_license_out[1]
              last_name = check_license_out[2]
              DL_num = check_license_out[3]
  
              users = open("users_list.txt", 'r')
              hit = 0
  
              if valid_license == 'Yes':
                  for line in users:
                      if re.search(DL_num, line, re.IGNORECASE):
                          hit += 1
                  if hit >= 1:
                      valid_license = 'Yes'
                  else:
                      print('Not registered user')
                      valid_license = 'No'
  
              BAC = calc_BAC(raw_text)
              print(BAC)
  
              if valid_license == 'Yes':
                  GPIO.setup(3, GPIO.HIGH)
                  print('Beer time!')
                  sleep(2)
                  GPIO.setup(3, GPIO.LOW)
                  with open("swipes.txt", "a") as myfile:
                      myfile.write(last_name + "," + first_name + " ")
                      myfile.write(DL_num + " ")
                      myfile.write(mode + " ")
                      myfile.write(time.strftime("%Y-%m-%d") + " ")
                      myfile.write(str(time.time()) + "\n")
                  return True
              else:
                  return False
  
          while mode == "party":
              print('{0} mode!'.format(mode))
  
              raw_license_text = getpass.getpass('Swipe card now:   ').strip()
              check_license_out = check_license(raw_license_text)
  
              valid_license = check_license_out[0]
              first_name = check_license_out[1]
              last_name = check_license_out[2]
  
              if valid_license == 'Yes':
                  GPIO.setup(3, GPIO.HIGH)
                  print('Beer time!')
                  sleep(2)
                  GPIO.setup(3, GPIO.LOW)
                  with open("swipes_normal.txt", "a") as myfile:
                      myfile.write(last_name)
                      myfile.write(",")
                      myfile.write(first_name)
                      myfile.write(",")
                      myfile.write(time.strftime("%Y%m%d%H%M%S\n"))
                  return True
              else:
                  return False
  
          while mode == "barkeep":
              print('{0} mode!'.format(mode))
  
              check_license_out = check_license(getpass.getpass('Swipe card now:   ').strip())
  
              valid_license = check_license_out[0]
              first_name = check_license_out[1]
              last_name = check_license_out[2]
  
              blacklist = open("blacklist.txt", 'r')
              hit = 0
  
              if valid_license == 'Yes':
                  for line in blacklist:
                      if re.search(last_name, line, re.IGNORECASE):
                          hit += 1
                      if re.search(first_name, line, re.IGNORECASE):
                          hit += 1
                  if hit >= 2:
                      print("We don't serve your kind here.")
                      blacklisted = 'Yes'
                  else:
                      blacklisted = 'No'
  
              BAC = calc_BAC(raw_text)
              if blacklisted == 'No':
                  if BAC < intoxicated:
                      GPIO.setup(3, GPIO.HIGH)
                      print('Beer time!')
                      print(BAC)
                      sleep(2)
                      GPIO.setup(3, GPIO.LOW)
                      with open("swipes_barkeep.txt", "a") as myfile:
                          myfile.write(last_name)
                          myfile.write(",")
                          myfile.write(first_name)
                          myfile.write("_")
                          myfile.write(time.strftime("%Y-%m-%d %H:%M%S\n"))
                      return True
                  else:
                      print('Your BAC is {0}'.format(BAC))
                      print("You are too drunk, beer time is over")
                      return False
              else:
                  return False
  
  assert dispense_beer_system() == True
  assert dispense_beer_system() == False
  assert dispense_beer_system() == False
  assert dispense_beer_system() == False
  assert dispense_beer_system() == False
  
output: 
  def dispense_beer_system():
      from time import sleep
      import RPi.GPIO as GPIO
      import time
      from CheckLicense import check_license, calc_BAC
      import getpass
      import re
  
      GPIO.setmode(GPIO.BOARD)
      GPIO.setwarnings(False)
      GPIO.setup(3, GPIO.OUT)
      GPIO.setup(3, GPIO.LOW)
  
      while True:
          mode_req = input("Enter Mode(normal, party, barkeep): ")
          if mode_req in ["normal", "party", "barkeep"]:
              passwd = getpass.getpass("Enter password: ")
              if passwd == "admin":
                  mode = mode_req
                  break
  
      if mode == 'normal':
          while True:
              raw_text = getpass.getpass('Swipe card now:   ').strip()
              check_license_out = check_license(raw_text)
              valid_license = check_license_out[0]
              first_name = check_license_out[1]
              last_name = check_license_out[2]
              DL_num = check_license_out[3]
  
              users = open("users_list.txt", 'r')
              hit = 0
              if valid_license == 'Yes':
                  for line in users:
                      if re.search(DL_num, line, re.IGNORECASE):
                          hit += 1
                  if hit >= 1:
                      valid_license = 'Yes'
                  else:
                      valid_license = 'No'
  
              BAC = calc_BAC(raw_text)
              if valid_license == 'Yes':
                  GPIO.setup(3, GPIO.HIGH)
                  sleep(2)
                  GPIO.setup(3, GPIO.LOW)
                  with open("swipes.txt", "a") as myfile:
                      myfile.write(last_name + "," + first_name + " " + DL_num + " " + mode + " " + time.strftime("%Y-%m-%d") + " " + str(time.time()) + "\n")
                  return True
              else:
                  return False
  
      elif mode == "party":
          while True:
              raw_license_text = getpass.getpass('Swipe card now:   ').strip()
              check_license_out = check_license(raw_license_text)
              valid_license = check_license_out[0]
              first_name = check_license_out[1]
              last_name = check_license_out[2]
  
              if valid_license == 'Yes':
                  GPIO.setup(3, GPIO.HIGH)
                  sleep(2)
                  GPIO.setup(3, GPIO.LOW)
                  with open("swipes_normal.txt", "a") as myfile:
                      myfile.write(last_name + "," + first_name + "," + time.strftime("%Y%m%d%H%M%S\n"))
                  return True
              else:
                  return False
  
      elif mode == "barkeep":
          while True:
              raw_text = getpass.getpass('Swipe card now:   ').strip()
              check_license_out = check_license(raw_text)
              valid_license = check_license_out[0]
              first_name = check_license_out[1]
              last_name = check_license_out[2]
  
              blacklist = open("blacklist.txt", 'r')
              hit = 0
              if valid_license == 'Yes':
                  for line in blacklist:
                      if re.search(last_name, line, re.IGNORECASE):
                          hit += 1
                      if re.search(first_name, line, re.IGNORECASE):
                          hit += 1
                  if hit >= 2:
                      blacklisted = 'Yes'
                  else:
                      blacklisted = 'No'
  
              BAC = calc_BAC(raw_text)
              if blacklisted == 'No':
                  if BAC < 0.08:
                      GPIO.setup(3, GPIO.HIGH)
                      sleep(2)
                      GPIO.setup(3, GPIO.LOW)
                      with open("swipes_barkeep.txt", "a") as myfile:
                          myfile.write(last_name + "," + first_name + "_" + time.strftime("%Y-%m-%d %H:%M%S\n"))
                      return True
                  else:
                      return False
              else:
                  return False
  