setting up environment in virtaulenv using python3 stuck on setuptools, pip, wheel

1.Check your internet connections. 2.Set python3 as your default python interpreter since you have python2.7 as your default python interpreter. Try using without any wheel by: virtualenv venv –no-wheel Then activate virtualenv and run:- pip install –upgrade pip pip install setuptools –no-use-wheel –upgrade pip install wheel –no-cache If you are behind proxy then use:- sudo … Read more

Why does the asyncio’s event loop suppress the KeyboardInterrupt on Windows?

There is workaround for Windows. Run another corouting which wake up loop every second and allow loop to react on keyboard interrupt Example with Echo server from asyncio doc async def wakeup(): while True: await asyncio.sleep(1) loop = asyncio.get_event_loop() coro = loop.create_server(EchoServerClientProtocol, ‘127.0.0.1’, 8888) server = loop.run_until_complete(coro) # add wakeup HACK loop.create_task(wakeup()) try: loop.run_forever() except … Read more

How to properly create and run concurrent tasks using python’s asyncio module?

Yes, any coroutine that’s running inside your event loop will block other coroutines and tasks from running, unless it Calls another coroutine using yield from or await (if using Python 3.5+). Returns. This is because asyncio is single-threaded; the only way for the event loop to run is for no other coroutine to be actively … Read more

How to install pip in CentOS 7?

The easiest way I’ve found to install pip3 (for python3.x packages) on CentOS 7 is: $ sudo yum install python34-setuptools $ sudo easy_install-3.4 pip You’ll need to have the EPEL repository enabled before hand, of course. You should now be able to run commands like the following to install packages for python3.x: $ pip3 install … Read more

How do you change the value of one attribute by changing the value of another? (dependent attributes)

Define darkness as a property class shade: def __init__(self, light): self.light = light @property def darkness(self): return 100 – self.light def __str__(self): return ‘{},{}’.format(self.light, self.darkness) Properties outwardly appear as attributes, but internally act as function calls. When you say s.darkness it will call the function you’ve provided for its property. This allows you to only … Read more