implement 'util.advance()'

gallery_dl/util.py

@@ -20,6 +20,7 @@ import string
 import _string
 import hashlib
 import datetime
+import itertools
 import urllib.parse
 from . import text, exception
 
@@ -100,6 +101,13 @@ def parse_bytes(value, suffixes="bkmgtp"):
         return 0
 
 
+def advance(iterable, num):
+    """"Advance the iterable by 'num' steps"""
+    iterator = iter(iterable)
+    next(itertools.islice(iterator, num, num), None)
+    return iterator
+
+
 def combine_dict(a, b):
     """Recursively combine the contents of b into a"""
     for key, value in b.items():