CODEWITHSUNDEEP
pythonfloating-point
gumbo1234
gumbo1234

Reputation: 35

How to count decimal places of a user-inputted float INCLUDING 0?

I need to count the number of decimal places in a user-inputted float so that my code will not accept any number with more or less than 2 decimal places (the number is supposed to be a price). Here is my code:

        while(flag == True):

        try:
            price = input("Enter the price: ")
            price = float(price)
            flag = False

            #price must be positive
            if float(price) < 0:
                print("Invalid input for the new price.")
                flag = True

        #check for 2 decimal places
        decimal = str(price)
        decimal = decimal.split(".")
        if len(decimal[1]) != 2:
            print("Invalid input for the new price.")
            flag = True

As of now it is working, except if I enter a price like 6.50, where the last decimal place is a 0. For some reason it is not accepting any number that ends in 0 as 2 decimal places. How can I fix this?

Upvotes: 0

Views: 2498

Answers (1)

user2390182
user2390182

Reputation: 73460

Just reverse the checking and float conversion order and you won't have the problem that the float conversion implicitly strips the '0':

str(float('6.50'))
# '6.5'

Do sth like:

# price = input("Enter the price: ")
price = raw_input("Enter the price: ")  # python2
try:
    assert len(price.split(".")[1]) == 2
    price = float(price)
except (AssertionError, ValueError):
    print("Invalid input for the new price.")

Upvotes: 1

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