I’m sorry to change codes but this is my method to understund things 
Here I’m just added the input, it looks more logical if customer wants to choose his request by itself…
but the problem is how to use the last balance to do a new request.
some suggestion Sir @YaserAlnajjar
I tried to do in the last:
balance -= balance
but I will find balance = 0 by this way
request = raw_input("put your request : ")
request = int(request)
def give(request, amount):
print ("give " + str(amount))
return request - amount
def do_request(balance, request):
balance -= request
amounts = [100, 50, 10, 5, 1]
while (request > 0):
for amount in amounts:
if (request >= amount):
if amount == 1:
amount = request
request = give(request, amount)
break
return balance
def withdraw(balance, request):
if (not isinstance(balance, int) or not isinstance(request, int)):
print ("Inputs must be numbers")
elif (request <= 0):
print ("Request must be greater than 0")
elif (request > balance):
print ("You don't have enough funds")
else:
return do_request(balance, request)
balance = 500
balance = withdraw(balance, request)
print ("Your balance : " + str(balance))
Thank you sir 
sure Sir