python convert a string to a integer for multiplication

Question

I realise that this is probably simple and basic to you guys, its for my childs homework and I don't have any experience or idea on the use of Python. She needs to get the code to request a number, multiply it by 9 and show the result. She is using the code below, however it repeats the number rather than multiply it. (ie it show 3 * 9 as 999 instead of 27). From what I have read it appears this is something to with multiplying integer by strings (though I may be wrong). Any help would be greatly appreciated.

number=input("Enter a number to multiply by 9 ")
number=number*9
print('the answer is '+number)

Can you share the version of python you are using to run this code ? — Tanveer Alam, Nov 30 '14 at 14:57
Thats because number is a string here, multiplying a string just concatenates it — Tim, Nov 30 '14 at 14:57
print('the answer is '+str(number)), input does the conversion to int. Anyways its int(val) or float(val) for decimals — el3ien, Nov 30 '14 at 14:57
http://stackoverflow.com/questions/3800846/differences-between-input-and-raw-input — Tanveer Alam, Nov 30 '14 at 15:00

Andy · Accepted Answer · 2014-11-30T15:03:19.527

1

Wrap your input in either int or float

number=int(input("Enter a number to multiply by 9 "))

or

number=float(input("Enter a number to multiply by 9 "))

This is done because input accepts strings and you have to convert these to numerals.

edited Nov 30 '14 at 15:03

answered Nov 30 '14 at 14:57

Andy

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input doesn't accept strings, i mean if you enter 10 it accepts it as an integer itself. – Alfie Nov 30 '14 at 16:21
@Alfie, for Python 2, that is correct. For Python 3, that is not. (See [here](http://stackoverflow.com/questions/1964996/specify-input-type-in-python) ). I assumed Python 3 based on the `print` function utilized. – Andy Nov 30 '14 at 16:44

python convert a string to a integer for multiplication

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