Steve Holden schrieb:
Diez B. Roggisch wrote:
[...]
The only valid reason for doing imports inside functions is if you
otherwise get into circular dependency hell, or have modules that need
some manipulation of the sys.path before they actually can be imported.
This is never true for system modules, and certainly to avoid if possible.
Well there is also the somewhat obscure point that an import of specific
names inside a function makes them local, which *might* make a
performance difference with tight loop nesting inside - though obviously
the need for such will best be determined by benchmarking:
But that could be mitigated using aliasing, which is a more general
optimization technique, as it works not only for imported names but also
for e.g. bound methods, or any other chained lookups.
Diez
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