Message 291782 - Python tracker

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In-reply-to
Author	rhettinger
Recipients	ezio.melotti, mrabarnett, rhettinger, umedoblock
Date	2017年04月17日.04:55:21
SpamBayes Score	-1.0
Marked as misclassified	Yes
Message-id	<1492404921.65.0.998749061407.issue30086@psf.upfronthosting.co.za>

Content
What you're seeing is a feature of the grammar. Function allow an optional trailing comma in the argument list: >>> pow(2, 5) 32 >>> pow(2, 5,) 32 So, to create a tuple inside in an argument list, you need the extra layer of parentheses. Sorry, this isn't a real bug. It is just a conflict resolution between use of a comma to separate arguments in a function call and use of a comma to create a tuple.

Content

What you're seeing is a feature of the grammar.
Function allow an optional trailing comma in the argument list:
 >>> pow(2, 5)
 32
 >>> pow(2, 5,)
 32
So, to create a tuple inside in an argument list, you need the extra layer of parentheses.
Sorry, this isn't a real bug. It is just a conflict resolution between use of a comma to separate arguments in a function call and use of a comma to create a tuple.

History
Date	User	Action	Args
2017年04月17日 04:55:21	rhettinger	set	recipients: + rhettinger, ezio.melotti, mrabarnett, umedoblock
2017年04月17日 04:55:21	rhettinger	set	messageid: <1492404921.65.0.998749061407.issue30086@psf.upfronthosting.co.za>
2017年04月17日 04:55:21	rhettinger	link	issue30086 messages
2017年04月17日 04:55:21	rhettinger	create

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