activestate / code

ActiveState Code Recipes

ActiveState Code Recipes

Welcome to the ActiveState Code recipes repo! We have migrated all of the great content from code.activestate.com to its new forever-home here at GitHub. This makes it easier for everyone to submit new recipes, contribute code and integrate all the great information into their own projects.

The vast majority of code that existed on the code.activestate.com website has a home here, however if you do come across any recipe that is missing, or conversely, is totally outdated and no longer relevant please submit an issue.

What is this repo for?

This repo exists to contribute useful snippets, utility functions, and other interesting tidbits in any language that may be helpful to other developers.

Is there a master list of all the recipes?

You can find the master index of all recipes over at the wiki.

Coming Soon: Search Functionality!

How could I submit a new recipe?

1. Fork this repo.
2. Create your new recipe in the correct language subfolder (create a new folder if it doesn't already exist).
3. Make sure you have included a README as well as your source file.
4. Submit a PR.

Coming Soon: Submit recipes hosted in your own repo linked back from here!

How do I submit a change or revision to a recipe?

Same as above, fork the repo and submit a PR with your change.

What license is this code released under?

By default, all newly submitted code is licensed under the MIT license. If your recipe is being released under a different license, please make sure to include a LICENSE file inside your recipe directory.

All legacy recipes retain their original license. Please see the LICENSE file inside each recipe folder for details.

How else can I contribute?

Recipes don't always have to be code - great documentation, tutorials, general tips and even general improvements to our wiki are greatly appreciated.

code's Issues

Ping onn

Create ur own DIY project at ActiveState Code

J

J

recipe-578108.py

what is u in line 15?

CODE

Requesting recvall2 update

The recvall2 code was posted sometime ago but never really updated. I am currently using the snippet of code recvall2 and have run into a problem. The author originally stated that he would try to update the recvall function to handle data that is a duplicate of the end marker but has not due to the fact that he assumes that the chances of this happening is low. Although the chances of this happening are pretty low I am in a situation where the data is a duplicate of the end marker. I am trying to send over a copy of my python script using sockets however the script contains a copy of the end marker so the recvall breaks at the end marker, not receiving the full data. I am requesting for someone to update the snippet of code.(Maybe try combining the End Marker method with a timeout method to check if data is still present after detecting an End Marker?)

Tail call optimization decorator (Python)

I'm not positive, but I don't think this recipe made it into the repo: http://code.activestate.com/recipes/474088-tail-call-optimization-decorator/

Here's the updated code for Python 3 (inherit from BaseException, and updated syntax for except):

import sys

class TailRecurseException(Exception):
  def __init__(self, args, kwargs):
    self.args = args
    self.kwargs = kwargs

def tail_call_optimized(g):
  """
  This function decorates a function with tail call
  optimization. It does this by throwing an exception
  if it is it's own grandparent, and catching such
  exceptions to fake the tail call optimization.

  This function fails if the decorated
  function recurses in a non-tail context.
  """
  def func(*args, **kwargs):
    f = sys._getframe()
    if f.f_back and f.f_back.f_back \
        and f.f_back.f_back.f_code == f.f_code:
      raise TailRecurseException(args, kwargs)
    else:
      while 1:
        try:
          return g(*args, **kwargs)
        except TailRecurseException as e:
            args = e.args
            kwargs = e.kwargs
  func.__doc__ = g.__doc__
  return func

@tail_call_optimized
def factorial(n, acc=1):
  "calculate a factorial"
  if n == 0:
    return acc
  return factorial(n-1, n*acc)

print(factorial(10000))
# prints a big, big number,
# but doesn't hit the recursion limit.

@tail_call_optimized
def fib(i, current = 0, next = 1):
  if i == 0:
    return current
  else:
    return fib(i - 1, next, current + next)

print(fib(10000))
# also prints a big number,
# but doesn't hit the recursion limit.

Directory listing too large, github truncates it at 1K

Directory listing in some areas is too large, Github truncates it at 1K

here are some options:

option 1: (simple option)
please reorganize into sub-directories containing no more than 1k for each directory

option 2: (better option)
create an index file, which lists all the recipes and may be even adds descriptions for each too.

Easier way to search recipe?

Say I want to have enums in my (Python) project and I am searching through the recipes hoping to find something that fits my description. It would be easier for me to search if there was a file depicting what each recipe does (<100 words for each recipe) with 'tags'. Since there are over 4k recipes in Python and many recipes do not have good (easy to understand) names and I have to go through their readme to find what they do. Of course, I can search for recipes with name containing Enum in the Python folder but that may not give the best possible results at all times.

Search fails

https://code.activestate.com/search/#q=test returns the following:
The Google Web Search API is no longer available. Please migrate to the Google Custom Search API (https://developers.google.com/custom-search/)

Blablahblsh

***Test Failed*** 2 failures

This code fails:

> python3 bresenham_nd.py
**********************************************************************
File "bresenham_nd.py", line 14, in __main__._bresenhamline_nslope
Failed example:
    _bresenhamline_nslope(s)
Expected:
    array([[ 0.,  0.,  0.,  0.]])
Got:
    array([[0., 0., 0., 0.]])
**********************************************************************
File "bresenham_nd.py", line 18, in __main__._bresenhamline_nslope
Failed example:
    _bresenhamline_nslope(s)
Expected:
    array([[ 0.,  0.,  1.,  0.]])
Got:
    array([[0., 0., 1., 0.]])
**********************************************************************
1 items had failures:
   2 of   6 in __main__._bresenhamline_nslope
***Test Failed*** 2 failures.

doc_inherit doesn't work with two levels of sub-classing

I'm trying to get the doc_inherit recipe (576862) to work with my classes, and the problem is that sometimes I have classes that go 2 levels down from the base class, rather than just one. This leads to an infinite recursion when the middle layer uses doc_inherit for a method.

Here is a minimal case that reproduces my problem:

from recipe_576862 import doc_inherit

class Base(object):

    def foo(self):
        "Base class foo"
        pass

class Mid(Base):

    @doc_inherit
    def foo(self):
        # Should inherit doc string from Base
        pass

class Final(Mid):

    def __init__(self): pass

obj = Final()
obj.foo()

The output is:

python doc-inherit-bug.py 
Traceback (most recent call last):
  File "doc-inherit-bug.py", line 22, in <module>
    obj.foo()
  File "/Users/Mike/Downloads/recipe_576862.py", line 34, in __get__
    return self.get_with_inst(obj, cls)
  File "/Users/Mike/Downloads/recipe_576862.py", line 40, in get_with_inst
    overridden = getattr(super(cls, obj), self.name, None)
[snip]
  File "/Users/Mike/Downloads/recipe_576862.py", line 34, in __get__
    return self.get_with_inst(obj, cls)
  File "/Users/Mike/Downloads/recipe_576862.py", line 40, in get_with_inst
    overridden = getattr(super(cls, obj), self.name, None)
RuntimeError: maximum recursion depth exceeded while calling a Python object

Unfortunately, I don't understand python's super well enough to figure out how to fix it. Anyone have an idea how the recipe could be tweaked to allow this use case?

Thanks so much for your help.

Undefined function in recipe-580746.py

In recipe-580746.py class TK_Table, make_autoscroll() seems not to be defined.

Sorry if I'm wrong. I might add further infos when i looked into it.

How to use retrieve() in python3 code

Can a example be given how to use recipes/Python/577009_Improvements_urllibURLopenretrieve/recipe-577009.py in actual code?

MineGo

Here is my MineGo Referral Code: axel Sign up now and let's win together.

comments?

I was viewing an ActiveState recipe at: https://code.activestate.com/recipes/65207-constants-in-python/

I saw the link to this GitHub repo. I'm not sure what is the intention of this repo. Is it meant to replace the website? If so, the repo is missing a very important thing: the comments.

Many recipes include comments that expand upon the recipes themselves. Look at the page I mentioned above for an example.

Code does not run

Running the code with python3 does not yield anything.

connection refused

Hi,
I am following this recipe: https://github.com/ActiveState/code/blob/3b27230f418b714bc9a0f897cb8ea189c3515e99/recipes/Python/577548_HTTPS_httplib_Client_ConnectiCertificate/recipe-577548.py

but I am getting the following error:

Traceback (most recent call last):
File "./firas.py", line 45, in
conn.request('GET', '/_searchguard/authinfo')
File "/usr/lib64/python2.7/httplib.py", line 1017, in request
self._send_request(method, url, body, headers)
File "/usr/lib64/python2.7/httplib.py", line 1051, in _send_request
self.endheaders(body)
File "/usr/lib64/python2.7/httplib.py", line 1013, in endheaders
self._send_output(message_body)
File "/usr/lib64/python2.7/httplib.py", line 864, in _send_output
self.send(msg)
File "/usr/lib64/python2.7/httplib.py", line 826, in send
self.connect()
File "./firas.py", line 26, in connect
sock = socket.create_connection((self.host, self.port), self.timeout)
File "/usr/lib64/python2.7/socket.py", line 571, in create_connection
raise err
socket.error: [Errno 111] Connection refused

Any help is really appreciated. I am not seeing anything in the logs that can help me in debugging this issue.

Thanks,
Firas Khasawneh

tail -f in Python : not showing appended content

'tail -f in Python' does not seem to work properly. When I run this on some file it prints the content but as I update the content or append content to file and save it, console does not get updated unlike tail -f
link: https://github.com/ActiveState/code/tree/master/recipes/Python/157035_tail_f_in_Python

DOC: what does "b/w" mean?

I don't understand this:

Returns a list of points from (start, end] by ray tracing a line b/w the points.

Code1205

get_rev_children() ?

In recipe-579138.py, there is a get_rev_children method in the depth-first search. This method does not work on any of my editors/REPLs and there is no documentation on it anywhere. Is this a typo? Or is something missing?

Javascript recipe is actually Java

The below recipe appears to be for Java, not Javascript (public static void main(String[] args)...)

https://github.com/ActiveState/code/blob/master/recipes/JavaScript/576955_Incrementing_counter/recipe-576955.js

dmake is not getting included in ActivePerl-5.28 windows build configuration

I added the package dmake to a fork of an ActivePerl-5.28 build configuration, however, it doesn't appear to exist at all in the installation directory C:\Perl64...

MetaMask State logs - v4.0.1 (814)

Wiki is full of duplicated entries and broken links.

The last commit of the wiki left most of its pages chock full of duplicates and incorrect links. I cleaned it up some, but someone should probably write a proper script to generate those files instead of whatever bone-headed method was used last time.

https://github.com/shadowsocks/shadowsocks-iOS/releases/download/2.6.3/ShadowsocksX-2.6.3.dmg

Test machine