Run my Python code in sublime text3 and in IDLE,But the results are not the same

Question

I want to check whether a file exists using Python, C:/test/UpdatePackage/filelist is an existing file.

When run in sublime text 3, the result is wrong:

>>> f = "C:/test/UpdatePackage/filelist"
>>> import os
>>> os.path.isfile(f)
False
>>> 

But run in Python 3.4 GUI

Python 3.4.3 (v3.4.3:9b73f1c3e601, Feb 24 2015, 22:43:06) [MSC v.1600 32 bit (Intel)] on win32
Type "copyright", "credits" or "license()" for more information.

>>> f = "C:/test/UpdatePackage/filelist"
>>> import os
>>> os.path.isfile(f)
True
>>>

Answer 1

in addition to timgeb's answer:

I haven't tried it, but os.path.isfile(os.path.normpath(f)) should give you the expected behaviour. use normpath() , then you can use either \\ or / as separator and your code is (more) independent from your platform or interpreter (eg if you get the path from user input or other sources).

Answer 2

Use f = "C:\\\\test\\\\UpdatePackage\\\\filelist" In your script. I believe IDLE automagically replaces the forward slashes for you with os.sep , that's why it is working inside IDLE.