PythonMonk – Learn Python in the browser

Post by callahad » Thu, Apr 04, 2013, 8:56 PM UTC

metaphorm wrote: post #31

melling wrote: post #26

Earlier quoted context omitted.

I dont' know Python but I'm thinking about learning it. What's experimental about Python 3? I don't have any legacy reasons to start with 2.7. Why wouldn't I just start with 3?

there's nothing experimental about Python 3. its a stable release version and I think its already up to sub version 3.3. HOWEVER, there are many important 3rd party libraries that have not yet been migrated to be fully compatible with Python 3. these libraries are far more important to writing real applications than the ability to use some newer syntactic constructs in Python 3.

Post by doktrin » Thu, Apr 04, 2013, 10:27 PM UTC

metaphorm wrote: post #28

gkoberger wrote: post #14

Interesting, however I feel like learning to code in a browser (even if it's JavaScript) doesn't work. Sure, you may learn how to do a for loop or how variables work. But, you don't learn how to actually use the language. Setting up a development environment, and understanding how everything is connected is much more important. Let's say you ace everything here, on CodeAcademy, etc. You still can't actually build any…

this kind of thing is a good resource for people who already know how to code, but need a fast and elegant syntax guide. its not useful for teaching beginners because, as you've said, it doesn't deal with the tool chain or project organization, etc. but if you know Ruby and want to learn Python, this is a great resource.

Post by wodow » Thu, Apr 04, 2013, 10:31 PM UTC

callahad wrote: post #32

metaphorm wrote: post #31

Earlier quoted context omitted.

there's nothing experimental about Python 3. its a stable release version and I think its already up to sub version 3.3. HOWEVER, there are many important 3rd party libraries that have not yet been migrated to be fully compatible with Python 3. these libraries are far more important to writing real applications than the ability to use some newer syntactic constructs in Python 3.

> HOWEVER, there are many important 3rd party libraries that have not yet been migrated to be fully compatible with Python 3. Are there any particular libraries blocking you? Numpy / SciPy, IPython, Requests, Django, Pyramid, Bottle, etc. have all been ported to Python 3.

Post by emillon » Thu, Apr 04, 2013, 10:38 PM UTC

phleet wrote: post #30

emillon wrote: post #27

Earlier quoted context omitted.

This particular behaviour can occur because the process is disallowed to call fork() and can be done with setrlimit() (see RLIMIT_NPROC). There should be other protections, though, because forking a "ls" is not the only way to access the filesystem.

Ah, interesting. File system access isn't blocked completely: __import__("os").listdir("/evaluate") open("/evaluate/test.py").readlines()

    __import__("os").execv("/usr/bin/uname", ["uname", "-a"])
    Linux ip-10-196-3-111 2.6.32-amazon-xen-r3 #1 SMP Mon Jan 16 21:03:16 PST 2012 i686 GNU/Linux

Post by pjscott » Thu, Apr 04, 2013, 11:26 PM UTC

phleet wrote: post #20

The first thing I always try on sites like these is stuff like this: __import__('commands').getstatusoutput('ls /') or __import__('subprocess').call(["ls", "-l"]) which gets blocked by the interpreter somehow with exceptions.OSError - [Errno 11] Resource temporarily unavailable I'm curious as to how you managed to do this - I've always been interested in how to sandbox something like this.