[CentralOH] 2014-11-21 道場 Scribbles 落書/惡文?

[pybokeh]

For those wondering what it means when someone say Python code is idiomatic
or Pythonic, here is a video that I thought was helpful by a great speaker
/ Python core developer named Raymond Hettinger:
https://www.youtube.com/watch?v=OSGv2VnC0go

On Mon, Nov 24, 2014 at 7:17 PM, <jep200404 at columbus.rr.com> wrote:

> very common code pattern in many programming languages:
>
>     loop executes n times
>     first value is zero (NOT 1)
>     last value in loop is n-1 (NOT n)
>     test is < n.
>         comparison is <, not <=
>         compared value is n, not n-1
>     next value is made at end of loop
>
>     >>> def do_n_times(n):
>     ...     i = 0
>     ...     while i < n:
>     ...         print i
>     ...         i += 1
>     ...
>     >>> do_n_times(3)
>     0
>     1
>     2
>     >>>
>
> A more Pythonic way of doing the above follows.
>
>     >>> def do_n_times(n):
>     ...     for i in range(n):
>     ...         print i
>     ...
>     >>> do_n_times(3)
>     0
>     1
>     2
>     >>>
>
> i is often used to index into data that one is going through.
> However in Python, one can often go through data one thing at a time,
> without have an index,
> so one often does something like the following fake Python code:
>
>     >>> def do_stuff(data_collection):
>     ...     for thing in data_collection:
>     ...         print thing
>     ...
>     >>> do_stuff(['hello', 3.14159+2.71828j, True, 42])
>     hello
>     (3.14159+2.71828j)
>     True
>     42
>     >>>
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