On 8/9/23 17:28, dn via Python-list wrote:
Side note: Using "...import identifier, ..." does not save storage-space over "import module" (the whole module is imported regardless, IIRC), however it does form an "interface" and thus recommend leaning into the "Interface Segregation Principle", or as our InfoSec brethren would say 'the principle of least privilege'. Accordingly, prefer "from ... import ... as ...".
Attribute lookup has *some* cost. That is, finding "c" in the local namespace is going to be a little quicker than "b.c", where Python finds "b" in the local namespace and then finds its "c" attribute; that's then a little quicker than "a.b.c", etc.
See all relevant commentary about premature optimisation, spending time optimising the wrong things, etc. but there *are* cases where it matters (c.f. a tight loop that will be run many many times)
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