Mailman 3 June 2017 - python-uk

Next Cambridge meeting: Tue 4th July 2017
by Tibs June 28, 2017

June 28, 2017

The next meeting of the Cambridge Python User Group will be on Tuesday 4th July 2017. The meeting is at 7pm, ending around 9:30pm. The venue, as normal, is the Raspberry Pi offices at 30 Station Road, CB1 2JH, Cambridge. Normally some of us go on to the pub afterwards. Jan Jedrzej Chwiejczak will talk about Exploring Python ByteCode Have you ever wondered what is happening when you execute your Python programs? Would you like to gain insight into writing performance oriented code or be able to explain to your colleagues whether Python is an interpreted or compiled language? If any of these questions spark your curiosity then please come round. I will take you on a walk in the forest of abstract syntax trees grown by lexers and parsers where compilers generate streams of bits understood and run by interpreters. We will examine together the "intermediate language" which expresses your code as machine instructions and look at the ways we can understand it for fun and profit using the dis module. For the second part of this talk, we will pair up and try to apply what we learned to optimise some problematic Python code and understand how it looks to the Interpreter. This is a beginner level talk and the only prerequisites are a curious mind, basic python knowledge and a laptop with Jupyter Notebook installed running Python 3.x. If you don't' have the latter rest assured there will be enough people with one around. Remember that we are now on meetup.com, at http://www.meetup.com/CamPUG/. If possible, please RSVP there for meetings so we have an idea of numbers. As an incentive, there's normally more detail about each meeting there, and you can also find out about future meetings. Tweeting may occur at https://twitter.com/campython Tibs

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Python Developers who want to make mistakes to break boundaries
by John Thistlethwaite June 22, 2017

June 22, 2017

Hi All, I wanted to reach out to the community and see if anyone (even if you are not actively looking) is interested in hearing about a number of well-funded start-ups at the beginning of their commercial mission with 4 - 5 years research behind them from a research phase? The companies are looking for start-up ready developers who want to immerse themselves in new technology and do something that will make a real difference at the same time as expanding your mind with coding problems that will keep you engaged, probably awake at night trying to solve because you will be so bought in to what you are doing and the potential that it becomes a life style rather than a job. I appreciate this is fairly limited in information, however if you are open to discussion please get in touch on this thread or on 01727 228 257 or john(a)understandingrecruitment.co.uk<mailto:john@understandingrecruitment.co.uk> I look forward to hearing from intrigued readers in due course.

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Two new roles- Please ignore if you love your current job.
by Sophie Hendley June 19, 2017

June 19, 2017

Hey guys, Will keep it brief for you so as to not cause a nuisance. *Platform developer/ Online booking platform/ SOHO/ to 80k* The guys are passionate about, clean code, TDD, DevOps and open source *Python developer/ Start-up/ up to 75k if you are interested in/ Farringdon:* Python, Django, REST/ SOAP -Working on a product which is truly innovative in its industry (insurance). -Learning and discovering as you go, being independent and choosing the tech you work with. -Working in a team where the boss trusts you and in a team with an awesome variety of people who all get along and work collaboratively. -Learning from some of the most successful entrepreneurs out there. Drop me a message and we can have a chat. Thanks guys, hope you aren't all as hot as I am #shouldhaveinvestedinaircon Sophie -- Sophie Hendley| Principal Consultant| Digital Vision *M:* 07505145903 *E: *sophie.hendley(a)digvis.co.uk *W:* www.digvis.co.uk Sponsor me please!!!!- https://www.justgiving.com/sophiehendley/

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Room share at EuroPython
by Daniele Procida June 15, 2017

June 15, 2017

Hi, I'll be at EuroPython from Saturday 8th to Saturday 15th. Would anyone like to share a hotel room? Daniele

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A stack with better performance than using a list
by Jonathan Hartley June 13, 2017

June 13, 2017

I recently submitted a solution to a coding challenge, in an employment context. One of the questions was to model a simple stack. I wrote a solution which appended and popped from the end of a list. This worked, but failed with timeouts on their last few automated tests with large (hidden) data sets. From memory, I think I had something pretty standard: class Stack: def __init__(self): self.storage = [] def push(arg): self.storage.append(arg) def pop(): return self.storage.pop() if self.storage else None def add_to_first_n(n, amount): for n in range(n): self.storage[n] += amount def dispatch(self, line) tokens = line.split() method = getattr(self, tokens[0]) args = tokens[1:] method(*args) def main(lines): stack = Stack() for line in lines: stack.dispatch(line) (will that formatting survive? Apologies if not) Subsequent experiments have confirmed that appending to and popping from the end of lists are O(1), amortized. So why is my solution too slow? This question was against the clock, 4th question of 4 in an hour. So I wasn't expecting to produce Cython or C optimised code in that timeframe (Besides, my submitted .py file runs on their servers, so the environment is limited.) So what am I missing, from a performance perspective? Are there other data structures in stdlib which are also O(1) but with a better constant? Ah. In writing this out, I have begun to suspect that my slicing of 'tokens' to produce 'args' in the dispatch is needlessly wasting time. Not much, but some. Thoughts welcome, Jonathan -- Jonathan Hartley tartley(a)tartley.com http://tartley.com Made out of meat. +1 507-513-1101 twitter/skype: tartley

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Job post
by Safe Hammad June 13, 2017

June 13, 2017

Hi All, In case you might be interested, my company Arctic Shores is looking for a Senior Python Developer to join me and my team in sunny Manchester. Full details here: http://pythonjobs.github.io/jobs/arctic-shores-senior-python-developer.html If you've ever yearned to work in the Beautiful North and you're interested in finding out more, please get in touch with me directly. Best, Safe -- Safe Hammad safe(a)arcticshores.com

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Twickenham Coding Evening: an advert
by Tim Golden June 1, 2017

June 1, 2017

If you're an educator or know someone who is in the South/West London area and need help with teaching IT in schools, feel free to come along for help to the Twickenham Coding Evening. (It mostly doesn't involve coding and isn't currently in Twickenham, but still: just come.). Here's a blog post of mine, talking around the subject a little: http://ramblings.timgolden.me.uk/2017/05/31/helping-educators/ and the event is on EventBrite: https://www.eventbrite.co.uk/e/twickenham-coding-evening-june-2017-tickets-… TJG

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