Shmuel Fomberg wrote:
> Hi All.
Hi
> I have been looking on Python in the last weeks, and a few thoughts:
I have been working with python for two years now, and here's mine:
> they (the python world) hate mini-languages, and prefer objects with a
> lot of methods.
>
> for example, instead of sprintf("%10s", ...) they have string.ljust method.
however, you can do:
s = "Hello %s, I'm %d years old" % ("world!", 28)
where the % operator for strings does format-string substitution.
> The closure mechanizem is pretty weak, and can be better describe as
> constants placing, and is reduced to one liner.
>
> (something like: lambda x: x * value)
This is what I remember about closures from perl, and I use closures in
Python for eveerything I did in Perl. What can you do with a perl
closure more than this?
Oh, the one thing you can't do in Python is declare a complicated
*anonymous* (lambda) sub, but then you have lexical subs:
def generate_closure(x):
def complicated():
a = x**2
return math.sqrt(a)
return complicated
> Trying to cover for the weak closure, they have a 'generator' functions,
> with special command - yield.
>
> def Counter(start)
>
> x = start
>
> while x < 7:
>
> yield x
>
> x = x + 1
>
> so after we create the Counter, every time we call Counter.next the
> program return to the loop and run until the yield command.
>
> As much as I can see there is no way to pass parameter to the next command.
Is there a Perl equivalent?
> in Python, there is a map and filter functions. they don't like them
> very much, and the new syntex is:
>
> newList = [e*2 for e in oldList if e > 3]
>
> I don't know if I like this writing, because the flow zig-zags. starts
> with the "for e in oldList", then goes to the right with "if e > 3", and
> then to the left with "e*2".
>
> after years of maping and greping I'm used to see data flows in one
> direction.
The Perl syntax is also better in my opinion because it is less
cumbersome for chaining multiple maps/greps, while the Python way starts
to get messy after one pair. A bit surprising in a language that values
code clarity so much :)
> A weird thing about objects and inheritance: when calling a super's
> function, we can't call $self->SUPER::func(...) of like Moose super().
> (if I remember correctly) we call the super function by name.
> MyBase.func(self, ...).
You have super() in Python, and it has one of those "considered harmful"
articles:
http://fuhm.net/super-harmful/
> And I'm missing CPAN. they don't have a main archive of modules, but
> every module have his own website.
To my understanding, PyPI (the Python Package Index) is an effort to
create a CPyAN, but it just doesn't have the entrenched cultural place
of CPAN in Perldom
> Good morning.
It was :)
Good day,
Yosef.
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