Function isreserved

Lib/ntpath.py:311–316

Return true if the pathname is reserved by the system.

(path)

)

def isreserved(path):
    """Return true if the pathname is reserved by the system."""
    # Refer to "Naming Files, Paths, and Namespaces":
    # https://docs.microsoft.com/en-us/windows/win32/fileio/naming-a-file
    path = os.fsdecode(splitroot(path)[2]).replace(altsep, sep)
    return any(_isreservedname(name) for name in reversed(path.split(sep)))

def _isreservedname(name):
    """Return true if the filename is reserved by the system."""