Bottle fails to find templates on windows

Consider this simple sample:

import bottle

@bottle.route("/")
@bottle.view("test")
def test():
    return {}

bottle.run()

This sample will fail to find test.tpl on windows. It will fail for both ./ and ./view/. The reason is because os.path.abspath behavior is slightly different on windows and linux. On windows abspath preserves ending path separators, while on linux it doesn’t. So on windows abspath(“./”) returns “C:\projects\test\” while on linux it returns “/home/user/projects/test” (note the missing separator).

So when these expanded paths encounter this line in bottle. spath = os.path.abspath(spath) + os.sep

On windows we get a path that ends with two separators. This causes this if to always fail.

if not fname.startswith(spath): continue

This leads to all path probes failing on windows, and template never gets found.

[defnull]

You were bitten by this I think: https://github.com/python/cpython/pull/10082

[defufna]

Wow it seems like my python is the problem. I’m using: 3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:57:15) [MSC v.1915 64 bit (AMD64)

I tried the same sample with other versions of Python I have, and they all behave differently from 3.7.1. Here take a look:

3.7.4 (tags/v3.7.4:e09359112e, Jul  8 2019, 20:34:20) [MSC v.1916 64 bit (AMD64)
D:\Development\python\bottletest/ D:\Development\python\bottletest\test
D:\Development\python\bottletest\views/ D:\Development\python\bottletest\views\test

3.7.1 (v3.7.1:260ec2c36a, Oct 20 2018, 14:57:15) [MSC v.1915 64 bit (AMD64)
D:\Development\python\bottletest\/ D:\Development\python\bottletest\test
D:\Development\python\bottletest\views\/ D:\Development\python\bottletest\views\test

3.6.6 (v3.6.6:4cf1f54eb7, Jun 27 2018, 03:37:03) [MSC v.1900 64 bit (AMD64)
D:\Development\python\bottletest/ D:\Development\python\bottletest\test
D:\Development\python\bottletest\views/ D:\Development\python\bottletest\views\test

2.7.14 (v2.7.14:84471935ed, Sep 16 2017, 20:25:58) [MSC v.1500 64 bit (AMD64)
('D:\\Development\\python\\bottletest/', 'D:\\Development\\python\\bottletest\\test')
('D:\\Development\\python\\bottletest\\views/', 'D:\\Development\\python\\bottletest\\views\\test')

So the original code would work with different python. Sorry for wasting your time…