Fix element skipping for empty iterators

tilboerner · web-flow · commit 455dbe47fa25 · 2019-02-05T20:08:10.000+01:00
`next(&lt;iter&gt;)` raises `StopIteration` when the iterator is empty. Providing a default returns that value instead, allowing to skip elements gracefully when you don't care if they exist.
diff --git a/README.md b/README.md
@@ -170,7 +170,7 @@ Iterator
 
 #### Skips first element:
 ```python
-next(<iter>)
+next(<iter>, None)  # default of `None` avoids exception for empty <iter>
 for element in <iter>:
     ...
 ```
