simplify directory creation

Signed-off-by: ugrnm <ultrageranium@bleu255.com>

download_loooooops.py

@@ -101,13 +101,9 @@ for collection in data:
                     i["account"]["username"],
                     len(i["media_attachments"])))
 
-if not os.path.exists(output_dir):
-    os.mkdir(output_dir)
-
 for l in looooops:
     path = os.path.join(output_dir,"{}_{}".format(l['creator'], l['id']))
-    if not os.path.exists(path):
-        os.mkdir(path)
+    os.makedirs(path, exist_ok=True)
 
     print("\n")
     print("Downloading looops by ***{}***".format(l['creator']))