ValueError: too many values to unpack (expected 2) with a list of tuples in Python

Question

I have this issue when creating a code with Python. I pass a list of tuples but when unpacking it and then using the map function and then using a list. I get this Error:

ValueError: too many values to unpack (expected 2)

Any idea how to overcome this? I can't find a suitable answer yet related to a list of tuples:-(

Here is the code

stock_markets = [('AAPL','200'),('MSFT','780'),('ORCL','650'),('CISC','350')]

def analyze_stocks(stock_markets):
    current_max = 0
    stock_name = ''

    for company,price in stock_markets:
        if int(price) > current_max:
            current_max = int(price)
            stock_name = company
        else:
            pass

    return (stock_name, current_max)

list(map(analyze_stocks,stock_markets))

Answer 1

You're already iterating over your list with map . Your for loop inside the analyze function is not needed (since you're passing your stocks one by one already with map ) and it is the source of error. Correct version should be something like this:

stock_markets = [('AAPL','200'),('MSFT','780'),('ORCL','650'),('CISC','350')]

def analyze_stocks(stock_markets):
    current_max = 0
    stock_name = ''

    company, price = stock_markets
    if int(price) > current_max:
        current_max = int(price)
        stock_name = company

    return (stock_name, current_max)

list(map(analyze_stocks,stock_markets))