How to print when a value is between certain ranges?

I'd like to get my code to print/notify when the price is low and have the statement print once unless it reaches the higher range again. Then I want it to print when it is low again.

If it is very low, I want it to print that it is very low and have this only occur once unless if it reaches the higher range. Then I want it to print again when it is very low.

import requests
import json
import time

buybtc = range(37000, 40000) 
sellbtc = range(45000, 50000)



def btc_function():
    url = 'https://api.gdax.com/products/BTC-USD/trades'
    res = requests.get(url)
    json_res = json.loads(res.text)
    price = int(float(json_res[0]['price']) // 1) # Convert from str to float to int (to match the range value)



    print('---------------------')
    print('bitcoin = ', price)
    print('actual = ', json_res[0]['price'])
    print(' ')

    if price in buybtc:
        print('Low')
        print('---------------------')
        print(' ')
    #print buy coin here (only print this statement once!)



    elif price in sellbtc:
        print('Too High!')
        print('---------------------')
        print(' ')
    #print Do not buy more until low (only print this statement once until it reaches low again!)


    else:

        if int(float(json_res[0]['price']) // 1) < 37000:
            print('Lower than low')

            #print Buy more here! (will only buy more once until it reaches high price, then it will 
      print this again)

        else:
            print('Awaiting... ')
            print('---------------------')
            print(' ')


   while True:




    btc_function()

    time.sleep(5)

I'm assuming a for loop or while loop is needed?