Python - How to open or create a file in root folder on Ubuntu?

I want to create (or open if existed) a file with python with path /etc/yate/input.txt. Here is my code:

try:
     file = open("input.txt", "wb")
except IOError:
     print "Error"
with file:
     doSomething()

and I get "Error" message

How can I fix it?

Solution

You can import os.path, then check if the file exists. This might have also been answered before here How do I check whether a file exists using Python?

Code:

import os.path

Now, check if that file name exists in your file path:

file_exists = os.path.isfile(/etc/yate/input.txt)

if file_exists:
    do_something

Or, if you want to do something, like creating and opening the file if it does not exist:

if not file_exists:
    do_something_else

Update: In the link I provided, there are other ways to do this, like using pathlib instead of os.path.