Python on sysarcher/@ich_codehttps://sysarcher.github.io/categories/python/Recent content in Python on sysarcher/@ich_codeHugoen-usTue, 17 Mar 2020 21:22:37 +0200On WebAssemblyhttps://sysarcher.github.io/posts/web-assembly/Tue, 17 Mar 2020 21:22:37 +0200https://sysarcher.github.io/posts/web-assembly/<p>This blog is not going to define what WebAssembly is, how it interacts with JS or other languages; there are too many blogs and posts available on the internet already.</p> <p>If you&rsquo;re not familiar with WebAssembly, I would suggest you start here:</p> <ul> <li><a href="https://hacks.mozilla.org/2017/02/a-cartoon-intro-to-webassembly/">A cartoon intro to WebAssembly</a></li> <li><a href="https://developer.mozilla.org/en-US/docs/WebAssembly/Concepts">WebAssembly Concepts</a></li> </ul> <p>This blog post is about wondering what WebAssembly can look like for some usecases.</p> <h2 id="run-everywhere">Run Everywhere</h2> <p>WebAssembly can run everywhere - atleast that&rsquo;s the goal. It&rsquo;s performant - as performant as C/C++ and it&rsquo;s secure.</p>This blog is not going to define what WebAssembly is, how it interacts with JS or other languages; there are too many blogs and posts available on the internet already.

If you’re not familiar with WebAssembly, I would suggest you start here:

This blog post is about wondering what WebAssembly can look like for some usecases.

Run Everywhere

WebAssembly can run everywhere - atleast that’s the goal. It’s performant - as performant as C/C++ and it’s secure.

WebAssembly is a type of code that can be run in modern web browsers and provides new features and major gains in performance.

https://developer.mozilla.org/en-US/docs/WebAssembly/Concepts

Open Questions

Although designed for the web, WebAssembly is able to run portably across architectures. This can be a nice way to distribute applications. Some day perhaps WebAssembly runtimes will be a part of all OSes.

What needs to be determined IMO is:

  • Realtime capabilities

    Can WebAssembly modules written in C/C++ provide any RT capabilities? If so, then it’ll be interesting to evaluate whether a WebAssembly runtime is all that a PLC should be. Apps running the PLC would be delivered like software. Less stickiness for everybody.

  • Recompile all the things

    Can WebAssembly runtimes replace native programs? How about message queues, brokers implemented in WebAssembly? I know it’s not possible to compile all complicated software to WebAssembly today - but is that the future too?

  • UI

    Will Slack and it’s likes re-implement significant portions of their code to WebAssembly? Should work, right?

  • Edge

    Fastly has already done lots of work with their CDN running WebAssembly-isolated workloads. Can we bring this down to the Edge where we’re running containers today?

Conclusion

There’re so many things I’m looking an answer for. This year is going to be awesome!

]]>My Python Environmenthttps://sysarcher.github.io/posts/python-env/Wed, 12 Feb 2020 21:22:37 +0200https://sysarcher.github.io/posts/python-env/<p>The most common way people go about setting up a Python environment is to do something like this:</p> <div class="highlight"><pre tabindex="0" style="color:#f8f8f2;background-color:#272822;-moz-tab-size:4;-o-tab-size:4;tab-size:4;-webkit-text-size-adjust:none;"><code class="language-console" data-lang="console"><span style="display:flex;"><span>$ sudo apt install python3 python3-pip <span style="color:#75715e"># installs pip3</span> </span></span><span style="display:flex;"><span>$ sudo pip3 install --upgrade pip <span style="color:#75715e"># upgrade pip to latest version</span> </span></span></code></pre></div><p>Congrats, now you&rsquo;re stuck with whatever version ships with the distro. I think we can do better!</p> <h1 id="pyenv"><code>pyenv</code></h1> <p>My recommendation now, is to use <code>pyenv</code> with which you can manage multiple versions, virtualenvs through a nice CLI</p>The most common way people go about setting up a Python environment is to do something like this:

$ sudo apt install python3 python3-pip    # installs pip3
$ sudo pip3 install --upgrade pip         # upgrade pip to latest version

Congrats, now you’re stuck with whatever version ships with the distro. I think we can do better!

pyenv

My recommendation now, is to use pyenv with which you can manage multiple versions, virtualenvs through a nice CLI

Uninstall pip/pip3

Before proceeding, I’d suggest uninstalling pip using pip uninstall pip and sudo apt remove python3-pip

Installation

Using the pyenv installer project

$ sudo apt install libssl-dev \
                   libsqlite-dev \
                   libreadline-dev \
                   libbz2-dev  \
                   libsqlite3-dev  # I've observed failures without these libs
$ curl https://pyenv.run | bash
...
WARNING: seems you still have not added 'pyenv' to the load path.

# Load pyenv automatically by adding
# the following to ~/.bashrc:

export PATH="/home/taimoor/.pyenv/bin:$PATH"
eval "$(pyenv init -)"
eval "$(pyenv virtualenv-init -)"

This should set up pyenv for you. Read the instructions printed at the end and follow them! Add the three things to your ~/.bashrc or ~/.zshrc or whatever.

Usage (summarized)

Example: Install Python 3.8.1:

$ pyenv install 3.8.1

P.S: logout and log back in

P.S2: Tab completion works!

Virtualenv

Create a virtualenv

$ pyenv virtualenv 3.8.1 venv3.8    # create a virtualenv called venv3.8 based on python 3.8.1
$ pyenv activate venv3.8    # activate venv3.8
$ python --version
Python 3.8.1
$ which python
/home/taimoor/.pyenv/shims/python

That’s it! Now you can manage your anaconda and python environments, versions sooo much better.

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