def main():
cash = float(input("How much money: "))
coins = 0
def changeCounter(n):
while True:
if cash - n > 0:
cash -= n
coins += 1
else:
break
return
main()
changeCounter(0.25)
When I run this code, I get the error
UnboundLocalError: local variable 'cash' referenced before assignment
How can I fix this?
The problem is that the variables cash and coins live only in the "scope" of function main, i.e. are not visible in changeCounter. Try:
def main():
cash = float(input("How much money: "))
coins = 0
return cash, coins
def changeCounter(n, cash, coins):
while True:
if cash - n > 0:
cash -= n
coins += 1
else:
break
# return
return coins # presumably
cash, coins = main()
changeCounter(0.25, cash, coins)
You need to define cash and coins as global variable:
cash = 0
coins = 0
def main():
global cash, coins
cash = float(input("How much money: "))
coins = 0
def changeCounter(n):
global cash, coins
while True:
if cash - n > 0:
cash -= n
coins += 1
else:
break
return
main()
changeCounter(0.25)
But better way than storing the state in global variables is using returing variables and function arguments or other method. See Why are global variables evil?
