Update is_ignored to use fnmatch instead of glob

Author: shreve

nbgrader/utils.py

@@ -272,16 +272,14 @@ def self_owned(path):
     return get_osusername() == find_owner(os.path.abspath(path))
 
 
-def is_ignored(filename: str, ignore_globs: List[str] = None) -> bool:
+def is_ignored(filename: str, ignore_globs: List[str]) -> bool:
     """Determines whether a filename should be ignored, based on whether it
     matches any file glob in the given list. Note that this only matches on the
     base filename itself, not the full path."""
-    if ignore_globs is None:
-        return False
-    dirname = os.path.dirname(filename)
+
+    basename = os.path.basename(filename)
     for expr in ignore_globs:
-        globs = glob.glob(os.path.join(dirname, expr))
-        if filename in globs:
+        if fnmatch.fnmatch(basename, expr):
             return True
     return False