Code not compiling in Python3

Question

I wrote a code and it is getting compiled on my PC with Python3. But Showing error while uploading to Codechef server. Please suggest, I am coding for the first time in Python 3.

Traceback (most recent call last):
  File "/run-ls7W2DcLmzUs9GNKbLGN/solution.py", line 41, in <module>
    l,r,k=map(int,input().split())
  File "<string>", line 1
    9 23 1
       ^
SyntaxError: invalid syntax

mgilson · Accepted Answer · 2013-06-03 14:00:29Z

4

You're using python2.x which evaluates the string you enter for input. Change the function from input to raw_input and you should be all set.

If you want the code to work for both python2.x and python3.x, you could do a simple little hack like this at the top of your script:

try:
    #This raises `NameError` on python3.x since `raw_input` is renamed to `input`
    input = raw_input
except NameError: 
    pass

It's not pretty, but it works (and I've used things like this on occasion). Ultimately, this shadows the builtin input on python2.x, but that's really not a big deal. You probably don't want to be using that builtin for any serious coding anyway.

answered Jun 3, 2013 at 14:00

mgilson

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3 Comments

Gareth Latty Over a year ago

Or actually use Python 3.x

RoadieRich Over a year ago

If you're writing backwards compatible code, I'd recommend doing it the other way: if sys.version_info >= (3,): raw_input = input, so you don't confuse Python 2 programmers.

mgilson Over a year ago

@RoadieRich -- Yeah, I've done that one too. Tomato-tomato as far as I see it. My way avoids an extra import, but that's probably not much of a concern for most scripts.

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