[Python-ideas] Reuse "for" to express "given"

[Alexander Belopolsky]

> But I do have a mathematics background, and I don't remember ever seeing
> "for x = value" used in the sense you mean.

That's so because in mathematics, "for" is spelled ":" as in

 {2*a* : *a*∈*Z*}

If you can read the above, you should not have trouble reading

 {2*a* + *b* : *a*∈*Z *: *b = *1}
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