File tests in Python? [duplicate]

Question

I'd like to use Python 3.3.3 to test for the existence of a backup file.

Something like this:

if backup does not exist:
    create it
    write to backup

otherwise:
    run other procedures not related to backup file

Any suggestions?

Answer 1

Use os.path.exists or os.path.isfile:

>>> import os
>>> os.path.isfile('/path/to/file')
False

Answer 2

Take a look at os.path.exists.