Running total won't print properly
<pre><code>def load():    
    global name
    global count
    global shares
    global pp
    global sp
    global commission
    name=input("Enter stock name OR -999 to Quit: ")
    count =0
    while name != '-999':
        count=count+1
        shares=int(input("Enter number of shares: "))
        pp=float(input("Enter purchase price: "))
        sp=float(input("Enter selling price: "))
        commission=float(input("Enter commission: "))
        calc()
        display()
        name=input("\nEnter stock name OR -999 to Quit: ")

def calc():
    totalpr=0
    global amount_paid
    global amount_sold
    global profit_loss
    global commission_paid_sale
    global commission_paid_purchase
    global totalpr
    amount_paid=shares*pp
    commission_paid_purchase=amount_paid*commission
    amount_sold=shares*sp
    commission_paid_sale=amount_sold*commission
    profit_loss=(amount_sold - commission_paid_sale) -(amount_paid + commission_paid_purchase)
    totalpr=totalpr+profit_loss

def display():
    print("\nStock Name:", name)
    print("Amount paid for the stock:       $",      format(amount_paid, '10,.2f'))
    print("Commission paid on the purchase: $", format(commission_paid_purchase, '10,.2f'))
    print("Amount the stock sold for:       $", format(amount_sold, '10,.2f'))
    print("Commission paid on the sale:     $", format(commission_paid_sale, '10,.2f'))
    print("Profit (or loss if negative):    $", format(profit_loss, '10,.2f'))

def main():
    load()


main()

print("\nTotal Profit is $", format(totalpr, '10,.2f'))
</code></pre>

<p>The last line of code is indicative of the problem. The display for "totalpr" is not a running tally of, say, 3 entered stocks. It's merely the profit_loss restated. How do I get it to accurately display the running total for however many times someone decides to enter stock data? The way it works: someone enters the sentinel '-999' then the program adds up all the profit_loss from every instance and prints it out. That's it. </p>

<p>You are resetting <code>totalpr</code> every time <code>calc</code> is called.</p>

<pre><code>def calc():
    totalpr=0  # resets to zero every time
    # ...
    totalpr=totalpr+profit_loss  # same as `totalpr = 0 + profit_loss`
</code></pre>

<p>Instead, you have to initialize <code>totalpr</code> outside of <code>calc</code>:</p>

<pre><code>totalpr = 0  # set to zero only once
def calc():
    # ...
    totalpr = totalpr + profit_loss  # same as `totalpr += profit_loss`
</code></pre>

python python-3.x printing