There is no where statement but you can “emulate” it using for: a=[0] def f(x): a[0] += 1 return 2*x print [ (x, y) for x in range(5) for y in [f(x)] if y != 2 ] print “The function was executed %s times” % a[0] Execution: $ python 2.py [(0, 0), (2, 4), (3, … Read more
The typing module provides a function get_args which retrieves the arguments with which your Literal was initialized. >>> from typing import Literal, get_args >>> l = Literal[‘add’, ‘mul’] >>> get_args(l) (‘add’, ‘mul’) However, I don’t think you gain anything by using a Literal for what you propose.
I have tried recently manually installing python3.9 version in my Ubuntu from 3.6 version using apt install python3.9. Then pip3 was broken. The issue is because distutils were not build for the 3.9 version. So in my case I ran apt install python3.9-distutils to resolve my issue. In your case make sure to modify 3.x … Read more
PEP 572 contains many of the details, especially for the first question. I’ll try to summarise/quote concisely arguably some of the most important parts of the PEP: Rationale Allowing this form of assignment within comprehensions, such as list comprehensions, and lambda functions where traditional assignments are forbidden. This can also facilitate interactive debugging without the … Read more
I have found how to run Python 3.8 notebook on Colab. install Anaconda3 add (fake) google.colab library start jupyterlab access it with ngrok Here’s the code # install Anaconda3 !wget -qO ac.sh https://repo.anaconda.com/archive/Anaconda3-2020.07-Linux-x86_64.sh !bash ./ac.sh -b # a fake google.colab library !ln -s /usr/local/lib/python3.7/dist-packages/google \ /root/anaconda3/lib/python3.8/site-packages/google # start jupyterlab, which now has Python3 = 3.8 … Read more
It looks like at least on my Ubuntu 16.04, pip is shared for all Python versions in /usr/lib/python3/dist-packages/pip. This is what I did to get it working again: sudo apt remove python3-pip sudo python3.8 -m easy_install pip You might want to install the python 3.5 version of pip again with sudo python3.5 -m easy_install pip.
Consider installing pyenv with Homebrew on macOS brew update brew install pyenv OR Clone the repository to get the latest version of pyenv git clone https://github.com/pyenv/pyenv.git ~/.pyenv Define your environment variables (For a recent MacOS you may want to replace ~/.bash_profile with ~/.zshrc as that is the default shell) echo ‘export PYENV_ROOT=”$HOME/.pyenv”‘ >> ~/.bash_profile echo … Read more
Python 3 is precomputing the value of 2 ** 0.5 at compile time, since both operands are known at that time. The value of sqrt, however, is not known at compile time, so the computation necessarily occurs at run time. You aren’t timing how long it takes to compute 2 ** 0.5, but just the … Read more
This is actually a brand-new feature as of Python 3.8. Added an = specifier to f-strings. An f-string such as f'{expr=}’ will expand to the text of the expression, an equal sign, then the representation of the evaluated expression. Essentially, it facilitates the frequent use-case of print-debugging, so, whereas we would normally have to write: … Read more
PEP 572 contains many of the details, especially for the first question. I’ll try to summarise/quote concisely arguably some of the most important parts of the PEP: Rationale Allowing this form of assignment within comprehensions, such as list comprehensions, and lambda functions where traditional assignments are forbidden. This can also facilitate interactive debugging without the … Read more