CODEWITHSUNDEEP
pythonstringintdigit
HazzaMcJazza
HazzaMcJazza

Reputation: 53

How can I have an int variable with 0 as the first number in Python?

So, I'm doing some practice before my school assessment, was wondering how I'd make it so that when I enter an integer with a 0 as the first value, it wouldn't convert it into an integer with no zero at the start. Here's a little extract of my program:

initialNumber = int(input("Enter your 10 digit number: "))

while len(str(initialNumber)) != 10:
    print("Next time please enter a 10 digit numerical value excluding decimals...")
    time.sleep(1)
    initialNumber = int(input("Enter your 10 digit number: "))

calculator()

I'm using Python 3.4, I understand that I could do something along the lines of this:

initialNumber = input("Enter your ten digit number")

I understand that by using this it keeps the "0", but I need to convert the string into an integer for arithmetic purposes. Any help would be greatly appreciated :)

Upvotes: 1

Views: 7805

Answers (2)

Padraic Cunningham
Padraic Cunningham

Reputation: 180391

If you want ten individual ints from the input call list on the input and map to int:

initialNumber = list(map(int,(input("Enter your 10 digit number: "))))


In [1]: initialNumber = list(map(int,(input("Enter your 10 digit number: "))))
Enter your 10 digit number: 0123456789

In [2]: initialNumber
Out[2]: [0, 1, 2, 3, 4, 5, 6, 7, 8, 9]

while True:
    initialNumber = input("Enter your 10 digit number: ")
    if len(initialNumber) != 10 or not initialNumber.isdigit():
        print("Invalid input")
    else:
        print(list(map(int,initialNumber)))
        break

Normally you would use a try/except to check that the input is numeric but allowing negative numbers would not work so as out character count would be wrong.

Upvotes: 0

PVNRT
PVNRT

Reputation: 335

Although personally I do not see the sense doing this. I would create a string variable to hold the leading zeros before performing math operations. 

initialNumber = (raw_input("Enter your 10 digit number: "))

while len(str(initialNumber)) != 10:
    print("Next time please enter a 10 digit numerical value excluding decimals...")
    time.sleep(1)
    initialNumber = (raw_input("Enter your 10 digit number: "))

leadingZeros = (len(initialNumber) - len(str(int(initialNumber)))) * "0"

calculator()

After the arithmetic you can easily concatenate the zeros to the beginning the output.

Upvotes: 3

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