python - NameError when calling function -

i have write program has user input stock information, calculate variables, , spit out in while loop. keep getting error:

nameerror: name 'bc' not defined 

for line

amt_paidcomm_onpurch,sold_for,comm_onsale,profit_loss = calc(shares,pp,sp,bc) 

here code:

 def load():     shares = int(input("enter number of shares: "))     pp = float(input("enter purchase price: "))     sp = float(input("enter selling price: "))     bc = float(input("enter commission: "))     print("\n")      return shares, pp, sp, bc  def calc(shares,pp,sp,bc):     amt_paid = shares * pp     comm_onpurch  = amt_paid * bc     sold_for = shares * sp     comm_onsale = sold_for * bc     profit_loss = (sold_for - comm_onsale) - (amt_paid + comm_onpurch)      return amt_paid, comm_onpurch, sold_for,comm_onsale,profit_loss  def output(name, amt_paid, comm_onpurch, sold_for,comm_onsale,profit_loss):     print("stock name: ", name, "\n")     print("amount paid stock: $", format(amt_paid, ',.2f'))     print("commission paid on purchase: $", format(comm_onpurch, ',.2f'))     print("amount stock sold for: $", format(sold_for, ',.2f'))     print("commission paid on sale: $", format(comm_onsale, ',.2f'))     print("profit or loss (if negative): $", format(profit_loss, ',.2f'))     print('\n')  def main():     total=0.0     name=input('enter stock name or -999 quit: ')     while name != '-999':         shares,pp,sp,rate=load()         amt_paidcomm_onpurch,sold_for,comm_onsale,profit_loss = calc(shares,pp,sp,bc)         output(name,amt_paid,comm_onpurch,sold_for,comm_onsale,profit_loss)         total=total+profit_loss         name=input("enter stock name or -999 quitz: ")     print(total) main() 

thank you!!

when call load() assign variable bc name rate. either assign name bc or change calling of calc function use rate instead.

i.e. @ moment have:

    shares,pp,sp,rate=load()     amt_paidcomm_onpurch,sold_for,comm_onsale,profit_loss = calc(shares,pp,sp,bc) 

but want like:

    shares,pp,sp,bc=load()     amt_paidcomm_onpurch,sold_for,comm_onsale,profit_loss = calc(shares,pp,sp,bc) 

or:

    shares,pp,sp,rate=load()     amt_paidcomm_onpurch,sold_for,comm_onsale,profit_loss = calc(shares,pp,sp,rate)