For loop monthly budget program creating error

I am running this for loop code and it is creating an error, I cannot find out the problem with it

print("""
This program will prompt you to enter your budget, and amount spent
for a certain month and calculate if your were under or over budget.
You will have the option of choosing how many months you would like to
monitor.n""")
AmountSpent = 0
Budget = 0
numMonths = int(input("Enter the number of months you would like to monitor:"))
while numMonths<0:
    print("nNegative value detected!")
    numMonths = int(input("Enter the number of months you would like to monitor"))
for month in range(1, numMonths+1):
    print("n=====================================")
    AmountBudgeted = float(input("Enter amount budgeted for month "+month+":"))
    while AmountBudgeted<0:
         print("Negative value detected!")
         AmountBudgeted = float(input("Enter amount budgeted for month "+month+":"))
    AmountSpent = float(input("Enter amount spent for month "+month+":"))
    while AmountSpent<0:
         print("Negative value detected!")
         AmountSpent = float(input("Enter amount spent for month "+month+":"))
    if AmountSpent <= AmountBudgeted:
        underBy = AmountBudgeted - AmountSpent
        print("Under budget by " + underBy)
    else:
        overBy = AmountSpent - AmountBudgeted
        print("Over budget by " + overBy)
    if month == "1":
       print(f'your budget is {AmountBudgeted}.')

Any ideas on why I am getting this error? I have tried to figure it out on my own but I dont know why it is wrong

Answer

Your problem is that the for-loop variable month is an integer, so you can’t concatenate it to a string without converting it first. The easiest way to fix that is to use a format-string instead.

For example, this line: AmountBudgeted = float(input("Enter amount budgeted for month "+month+":"))

Should be changed to: float(input(f"Enter amount budgeted for month {month}:"))

(If you’re on an older version of Python you would write float(input("Enter amount budgeted for month {month}:".format(month=month))) instead.)

If you’re hard-set on using concatenation instead, the trick is to convert month to a string first using str(month).

Hope that helps!