While discussing with other developers about pros and cons of Python, one of the most common criticism I heard about the language syntax is the join method.
Indeed in python to join elements of an iterable you will do something like
<separator>.join(<iterable>) while in other language it is more often
The reason why Python syntax have been decided this way is that when joining iterable, what you want to achieve is to build a new string. Thus you don’t mind about the original type of the iterable.
Moreover the separator you define must be a string, so you start from a string to join elements into a string. This allow to define once (and only once) the join method instead of defining it in each iterable type.