I’m having issues with the .upper, .split, and .isalpha methods in my Python function. These methods are not working as expected. Normally, in Visual Studio Code, these methods are highlighted with a specific color when they are recognized correctly. However, this time they are not highlighted. Additionally, when I hover over these methods with my cursor, it shows “(function) upper: Any”, which indicates a problem. How can I resolve this issue in VS Code?

def crypto(crypt_input):
    

    crypt_input = crypt_input.upper()

    if len(crypt_input) == 0:

        raise Exception("Missing Argument")

    individual_symbols = crypt_input.split(",")

    if not all(symbol.isalpha() for symbol in individual_symbols):

        raise Exception("Input must be Alphabetical")

    else:
        symbols = ",".join(individual_symbols) #Comes in handy in cases where we want to serach for than one Coin

        url = f"https://production.api.coindesk.com/v2/tb/price/ticker?assets={symbols}" # url saved


    while True:
        result = get(url) #http request made 

        if result.status_code != 200:
            raise Exception(f"Failed to retrieve data:{result.status_code}")
        
        json_data = result.json() #data from url then parsed into Json

        results = []

        if "data" in json_data and isinstance(json_data["data"] , dict): # makes sure key "data" is actually existant in Parsed JSOn api and is a dictionary
            for symbol in individual_symbols:
                symbol = symbol.upper()
                try:
                    coin_data = json_data["data"][symbol] #Value:"BTC "of Key:"data" in this case would be another key to a sub dictionary
                    
                    if coin_data is None:
                        print(f"No data available for symbol{symbol}")
                        continue
                    
                    if all(key in coin_data for key in ('iso' , 'name' , 'ohlc')) and "c" in coin_data['ohlc'] and "ts" in coin_data:
                        results.append({
                            'iso':coin_data['iso'],
                            'name':coin_data['name'],
                            'Current_price':coin_data['ohlc']['c'],
                            "Timestamp": str(coin_data['ts'])

                        })
                    else:
                        print(f"Missing expected keys in coin_data: {coin_data}")
                except IndexError as e:
                    print(f"keyerror acessing data for symbol {symbol}: {e}")
            time.sleep(3)
        else:
            print("Invalid or missing 'data' key in JSON response")
        
        for result in results:
            print(jsonify(results))