Wikipedia:Reference desk/Archives/Computing/2024 May 15

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May 15

Python pre and post for loop terminology

I'm having trouble finding a reference for the proper terminology of two kinds of for loops in Python. The first one is the normal: for x in a: x+4 (I know this doesn't do anything, it is for this example) The second one is kind of backwards: x+4 for x in a What is the name of the for loop when the calculation comes before the "for" keyword? 75.136.148.8 (talk) 14:15, 15 May 2024 (UTC)

The second one is a list comprehension, not a for loop: https://docs.python.org/3/tutorial/datastructures.html#tut-listcomps Variouspotatoes (talk) 17:24, 15 May 2024 (UTC)

Thanks. I didn't think to jump to the data structures section of the documentation to look for it. 75.136.148.8 (talk) 18:21, 15 May 2024 (UTC)

It is only a list comprehension when enclosed between square brackets. Enclosed in curly braces, it becomes a set comprehension.  --Lambiam 14:08, 16 May 2024 (UTC)

And in round parentheses a generator expression. --Wrongfilter (talk) 15:12, 16 May 2024 (UTC)