Please help me to ask to enter again itself when value entered is not a number.

[sunil422]

I want the following program to ask to enter again without ending if entered value is not a integer. please help.

x=input('ENTER SUM')
try:
    p=float(x)
except:
    print('Error! Try again')
    quit()
y=input('ENTER RATE PER ANNUM')
try:
    r=float(y)
except:
    print('Error! Try again')
    quit()
z=input('ENTER TIME IN MONTH')
try:
    fz=float(z)
except:
    print('Error! Try again')
    quit()
t=(fz/12)
print('Interest=Rs',p*t*r/100,'\nAmount to pay=Rs',p+p*t*r/100)

[perfringo]

Please help us help you by using proper tags in order to understand your code.

[buran]

Probably, you have noticed that you have a lot of repeating code. This screams - define a function.
So first step would be to define a function that will take prompt and maybe conversion function and will return the user input converted using this conversion function.
In order to keep asking until you get valid input - ask inside infinite loop and return/breakout of the loop when user input is valid.

[sunil422]

[quote='buran' pid='123035' dateline='1597216916']
Probably, you have noticed that you have a lot of repeating code. This screams - define a function.
So first step would be to define a function that will take prompt and maybe conversion function and will return the user input converted using this conversion function.
In order to keep asking until you get valid input - ask inside infinite loop and return/breakout of the loop when user input is valid.
[/quo

Thank you!

[deanhystad]

def input_float(prompt):
    while True:
        try:
            return float(input(prompt))
        except:
            pass

p = input_float('ENTER SUM ')
r = input_float('ENTER RATE PER ANNUM ')
t = input_float('ENTER TIME IN MONTH ') / 12

print('Interest=Rs',p*t*r/100,'\nAmount to pay=Rs',p+p*t*r/100)

[perfringo]

EDIT: ninjad by deanhystad

As suggested by buran - one option is to create validation function and call it three times:

def validate(request):
    while True:
        answer = input(request)
        try:
            return float(answer)
        except ValueError:
            print(f'Expected float but {answer!r} was entered')

total = validate('Enter sum: ')
rate = validate('Enter rate per annum: ')
time = validate('Enter time in month: ')

# or alternatively:

total, rate, time = (validate(f'Enter {item}: ') for item in ('sum', 'rate per annum', 'time'))