Trouble is, that “one little thing” often turns out to be much, much more.
If all you’re doing is throwing together a quick-and-dirty script to do one little thing, why bother setting up a virtual environment at all? The first common mistake Python programmers make with virtualenv or venv is to just not bother with it. In this article we’ll walk through some of the common mistakes people make-and gotchas they succumb to-when working with virtual environments in Python.
Virtual environments-courtesy of the virtualenv tool in Python 2 and venv in Python 3-can be used to create a separate, isolated instance of the Python runtime for a project, with its own complement of packages. Python comes with an automated system for keeping a package set local to a given Python project.
#PYCHARM VENV INSTALL#
It’s all too easy to thoughtlessly install dozens of packages and in time end up with a Python environment fraught with conflicts between older and newer versions of tools, making work harder than it needs to be. The hard part is managing the accumulation of packages in a given Python installation. If there is a task you want to pull off-file format conversion, scraping and restructuring web pages, linear regression, you name it-odds are that one or more packages in the Python Package Index will fill your need. Here you did write to site-packages in your venv, which is likely what you want.One of the biggest draws of Python is its expansive ecosystem of third-party packages. Non-user install because user site-packages disabledĬreating c:myproject_venvlibsite-packagesmylibrary.egg-link (link to src) (MyProject_venv) C:MyProject>pip install -v -e. But, without explicitly activating the venv, even if you set the permissions to writeable, the development instalation won't write to your venv site-packages. NOTE: The message in the terminal "(.) site-packages is not writeable" refers to the site-packages in your Python base instalation. Something you likely want to avoid, because P圜harm won't recognize the development installation after it's done. This installs to site-packages (mind the path) outside your venv, and outside your Python base installation. ĭefaulting to user installation because normal site-packages is not writeableĪmeappdataoamingpythonpython38site-packagesmylibrary.egg-link (link to src) Something you likely want to avoid, because it pollutes your base installation. This installs to site-packages (mind the path) in your base Python installation. Non-user install because site-packages writeableĬreating c:program filespython38libsite-packagesmylibrary.egg-link (link to src) Run P圜harm as admin, executing the following from the terminal gives: C:MyProject>pip install -v -e. If you are using 1 venv, there will be 3 different site-packages involved (mind the paths). The decisive pip messages are based on write permissions of your site-packages, however you won't have to change any of the default permission if activating your venv on the terminal. Using the verbose flag -v while installing in development mode gives clues to what pip and setuptools are trying to do. (The problem isn't immediately obvious because unlike the terminal, functionalities like debugging, running, etc, integrate the venv in a seamless way.) The problem described results from having to activate the venv inside P圜harm's terminal.Ī description of the scenarios you'll likely encounter follows.
#PYCHARM VENV HOW TO#
I can't understand how to get the second import to work instead of the first across all modules of the mylibrary package: from _word import hello_function # > from setuptools import find_packages The below layout reproduces what I want to achieve. I have read most of the PyPA and setuptools documentation (and its many use cases), but I can't understand what is considered the correct way of doing this example. I want to understand what is considered the correct minimalist way to use setuptools with a "src/ layout" in a way that dispenses using src.
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