.get_template() not work with path Windows slashes (\).

[Hubert Książek]

Jinja does not always recognize Windows slashes (). This kind of slash is returned when you use Windows os.path.join()

from jinja2 import Environment, FileSystemLoader
env = Environment(
    loader= FileSystemLoader("here\\windows\\slashes\\work")
)
template = env.get_template("here\\windows\\slashes\\NOT\\work.jinja")

.get_template() should work even if the path is defined in Windows format (if the Windows system is used). I will prepare PR fixing this issue by myself.

Environment:

• Python version: 3.9.13
• Jinja version: 3.1.2

[Adrian]

Template names always use forward slashes, there are previous issues about this topic: #767, #880

PS: Even for filesystem paths you do not have to use backslashes - internally even all the Windows APIs work fine with forward slashes.