Meaning of - in Python

0 votes

I have found something interesting when looking at Python 3.3 grammar specification:

funcdef: 'def' NAME parameters ['->' test] ':' suite

The optional 'arrow' block was absent in Python 2 and I couldn't find any information regarding its meaning in Python 3. It turns out this is correct Python and it's accepted by the interpreter:

def f(x) -> 123:
    return x

Could anyone accustomed with this syntax explain it?

Nov 12, 2018 in Python by findingbugs
• 3,260 points
654 views

1 answer to this question.

0 votes

It's a function annotation.

In more detail, Python 2.x has docstrings, which allow you to attach a metadata string to various types of object. This is amazingly handy, so Python 3 extends the feature by allowing you to attach metadata to functions describing their parameters and return values.

answered Nov 12, 2018 by Priyaj
• 58,100 points

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