Web Reference: It's a common syntactical convention to allow trailing commas in an array, languages like C and Java allow it, and Python seems to have adopted this convention for its list data structure. When I'm make a multi-line list, dictionary, tuple or function call (see wrap a long line in Python), I prefer to put the closing bracket or brace on its own line: I also usually prefer to put each element on its own line, with a comma after each one, including the last element.This is called a trailing comma. A trailing comma is not necessary in P... Python allows trailing commas at the end of lists, tuples, and dictionaries. This optional feature improves code readability and makes it easier to add, remove, or reorder items without syntax errors.
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