On Sunday, September 3, 2017 at 5:10:13 PM UTC+5:30, Rick Johnson wrote:
> Andrej Viktorovich wrote:
> > I suppose p becomes array of strings but what [] means in this statement?
>
> Generally, it's an inline form of writing a loop that returns a list. There
> are other types as well.
Tsk tsk the confusioning continues
Rewrite
[p for p in sys.path]
as
[p | p ∈ sys.path]
Is that clearer?
And then as
{p | p ∈ sys.path}
And refresh the idea of set-builder notation
http://www.mathwords.com/s/set_builder_notation.htm
Note the the clunky ascii-fication of (most) programming languages (including
python)
is a minor distraction
The bigger and more real issue is that sets and lists are similar and different
Sets have no order, lists are ordered
As Peter pointed out this is a no-op
ie
[p for p in sys.path]
could be written as
list(sys.path)
[Not sure why he didnt say just sys.path]
Anyway this is a good example to distinguish
[p for p in sys.path]
from
{p for p in sys.path}
Both work in python
But the second is probably not correct because path-searching is order dependent
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