Why does 'mystring,' create a tuple in Python?

Trailing Commas: Demystifying the Creation of Tuples

In Python, trailing commas appended to expressions offer a curious result, causing the expression to transform into a tuple. To illustrate, consider the following code snippet:

>>> abc = 'mystring',
>>> print(abc)
('mystring',)

Instead of simply printing "mystring", the output displays ('mystring',). Why does this occur?

The answer lies in Python's syntax for tuples. According to the Python tutorial, "A tuple consists of a number of values separated by commas." In this case, the trailing comma signifies that the 'mystring' expression should be enclosed within a tuple. The parentheses serve primarily for visual clarity.

This behavior is employed to distinguish tuples from other constructs. For instance, parentheses are often utilized to group expressions or enclose arguments without forming tuples. The trailing comma provides a clear indication that the intended result is indeed a tuple.

For further insights into Python tuples and sequences, refer to the Python Tutorial's dedicated section.

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