Ixiaus a écrit :
> I have recently (today) just started learning/playing with Python. So
> far I am excited and impressed
Welcome onboard then !-)
> (coming from PHP background).
>
> I have a few questions regarding Python behavior...
>
> val = 'string'
> li = list(val)
> print li.reverse()
>
> returns nothing, but,
>
> val = 'string'
> li = list(val)
> li.reverse()
> print li
>
> returns what I want. Why does Python do that?
list.reverse (like list.sort) is a destructive in-place operation. Not
returning the object is reminder of the destructive nature of the
operation. That's a design choice, whether you agree with it or not
(FWIW, I don't, but I live with it !-)
Note that there's also the reverse() function that returns a reverse
iterator over any sequence, so you could also do:
li = list('allo')
print ''.join(reverse(li))
> Also I have been playing around with Binary math and noticed that
> Python treats:
>
> val = 00110
>
> as the integer 72 instead of returning 00110, why does Python do that?
Literal integers starting with '0' (zero) are treated as octal. It's a
pretty common convention (like 0x for hexa). FWIW, PHP does just the
same thing.
> (and how can I get around it?)
You can't. Python has no literal notation for binary integers so far.
Literal notation for binary ints is not a common feature anyway.
HTH
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