Hunterdn688

1. A utility tool to create.env files¶. Dump-env takes an.env.template file and some optional environmental variables to create a new.env file from these two sources. No external dependencies are used.
2. Aug 07, 2021 create (envdir) ¶ Create a virtual environment by specifying the target directory (absolute or relative to the current directory) which is to contain the virtual environment. The create method will either create the environment in the specified directory, or raise an appropriate exception.
3. Dead simple env file parsing for TypeScript. Contribute to ajmnz/env2ts development by creating an account on GitHub.

Source code:Lib/venv/

A utility tool to create.env files¶. Dump-env takes an.env.template file and some optional environmental variables to create a new.env file from these two sources. No external dependencies are used. Apr 18, 2021 You can't make.env files anymore, you'll have to use this new GUI by clicking the lock icon in the sidebar (near where the files are kept). Then you just enter the name of a key and its value. And in the repl, you do import os, and mysecret = os.environ 'name of your key here'. Good luck!:) Yes, they have deprecated the.env “file”.

The venv module provides support for creating lightweight “virtualenvironments” with their own site directories, optionally isolated from systemsite directories. Each virtual environment has its own Python binary (whichmatches the version of the binary that was used to create this environment) andcan have its own independent set of installed Python packages in its sitedirectories.

See PEP 405 for more information about Python virtual environments.

See also

Creating virtual environments¶

Creation of virtual environments is done by executing thecommand venv:

Running this command creates the target directory (creating any parentdirectories that don’t exist already) and places a pyvenv.cfg file in itwith a home key pointing to the Python installation from which the commandwas run (a common name for the target directory is .venv). It also createsa bin (or Scripts on Windows) subdirectory containing a copy/symlinkof the Python binary/binaries (as appropriate for the platform or argumentsused at environment creation time). It also creates an (initially empty)lib/pythonX.Y/site-packages subdirectory (on Windows, this isLibsite-packages). If an existing directory is specified, it will bere-used.

Deprecated since version 3.6: pyvenv was the recommended tool for creating virtual environments forPython 3.3 and 3.4, and is deprecated in Python 3.6.

Changed in version 3.5: The use of venv is now recommended for creating virtual environments.

On Windows, invoke the venv command as follows:

Alternatively, if you configured the PATH and PATHEXT variables foryour Python installation:

The command, if run with -h, will show the available options:

Changed in version 3.9: Add --upgrade-deps option to upgrade pip + setuptools to the latest on PyPI

Changed in version 3.4: Installs pip by default, added the --without-pip and --copiesoptions

Changed in version 3.4: In earlier versions, if the target directory already existed, an error wasraised, unless the --clear or --upgrade option was provided.

Note

While symlinks are supported on Windows, they are not recommended. Ofparticular note is that double-clicking python.exe in File Explorerwill resolve the symlink eagerly and ignore the virtual environment.

Note

On Microsoft Windows, it may be required to enable the Activate.ps1script by setting the execution policy for the user. You can do this byissuing the following PowerShell command:

PS C:> Set-ExecutionPolicy -ExecutionPolicy RemoteSigned -Scope CurrentUser

See About Execution Policiesfor more information.

The created pyvenv.cfg file also includes theinclude-system-site-packages key, set to true if venv isrun with the --system-site-packages option, false otherwise.

Unless the --without-pip option is given, ensurepip will beinvoked to bootstrap pip into the virtual environment.

Multiple paths can be given to venv, in which case an identical virtualenvironment will be created, according to the given options, at each providedpath.

Once a virtual environment has been created, it can be “activated” using ascript in the virtual environment’s binary directory. The invocation of thescript is platform-specific (<venv> must be replaced by the path of thedirectory containing the virtual environment):

When a virtual environment is active, the VIRTUAL_ENV environmentvariable is set to the path of the virtual environment. This can be used tocheck if one is running inside a virtual environment.

You don’t specifically need to activate an environment; activation justprepends the virtual environment’s binary directory to your path, so that“python” invokes the virtual environment’s Python interpreter and you can runinstalled scripts without having to use their full path. However, all scriptsinstalled in a virtual environment should be runnable without activating it,and run with the virtual environment’s Python automatically.

You can deactivate a virtual environment by typing “deactivate” in your shell.The exact mechanism is platform-specific and is an internal implementationdetail (typically a script or shell function will be used).

New in version 3.4: fish and csh activation scripts.

New in version 3.8: PowerShell activation scripts installed under POSIX for PowerShell Coresupport.

Note

A virtual environment is a Python environment such that the Pythoninterpreter, libraries and scripts installed into it are isolated from thoseinstalled in other virtual environments, and (by default) any librariesinstalled in a “system” Python, i.e., one which is installed as part of youroperating system.

A virtual environment is a directory tree which contains Python executablefiles and other files which indicate that it is a virtual environment.

Common installation tools such as setuptools and pip work asexpected with virtual environments. In other words, when a virtualenvironment is active, they install Python packages into the virtualenvironment without needing to be told to do so explicitly.

When a virtual environment is active (i.e., the virtual environment’s Pythoninterpreter is running), the attributes sys.prefix andsys.exec_prefix point to the base directory of the virtualenvironment, whereas sys.base_prefix andsys.base_exec_prefix point to the non-virtual environment Pythoninstallation which was used to create the virtual environment. If a virtualenvironment is not active, then sys.prefix is the same assys.base_prefix and sys.exec_prefix is the same assys.base_exec_prefix (they all point to a non-virtual environmentPython installation).

When a virtual environment is active, any options that change theinstallation path will be ignored from all distutils configurationfiles to prevent projects being inadvertently installed outside of thevirtual environment.

When working in a command shell, users can make a virtual environment activeby running an activate script in the virtual environment’s executablesdirectory (the precise filename and command to use the file isshell-dependent), which prepends the virtual environment’s directory forexecutables to the PATH environment variable for the running shell. Thereshould be no need in other circumstances to activate a virtualenvironment; scripts installed into virtual environments have a “shebang”line which points to the virtual environment’s Python interpreter. This meansthat the script will run with that interpreter regardless of the value ofPATH. On Windows, “shebang” line processing is supported if you have thePython Launcher for Windows installed (this was added to Python in 3.3 - seePEP 397 for more details). Thus, double-clicking an installed script in aWindows Explorer window should run the script with the correct interpreterwithout there needing to be any reference to its virtual environment inPATH.

API¶

The high-level method described above makes use of a simple API which providesmechanisms for third-party virtual environment creators to customize environmentcreation according to their needs, the EnvBuilder class.

The EnvBuilder class accepts the following keyword arguments oninstantiation:

• system_site_packages – a Boolean value indicating that the system Pythonsite-packages should be available to the environment (defaults to False).

• clear – a Boolean value which, if true, will delete the contents ofany existing target directory, before creating the environment.

• symlinks – a Boolean value indicating whether to attempt to symlink thePython binary rather than copying.

• upgrade – a Boolean value which, if true, will upgrade an existingenvironment with the running Python - for use when that Python has beenupgraded in-place (defaults to False).

• with_pip – a Boolean value which, if true, ensures pip isinstalled in the virtual environment. This uses ensurepip withthe --default-pip option.

• prompt – a String to be used after virtual environment is activated(defaults to None which means directory name of the environment wouldbe used). If the special string '.' is provided, the basename of thecurrent directory is used as the prompt.

• upgrade_deps – Update the base venv modules to the latest on PyPI

Changed in version 3.4: Added the with_pip parameter

New in version 3.9: Added the upgrade_deps parameter

Creators of third-party virtual environment tools will be free to use theprovided EnvBuilder class as a base class.

The returned env-builder is an object which has a method, create:

Create a virtual environment by specifying the target directory(absolute or relative to the current directory) which is to contain thevirtual environment. The create method will either create theenvironment in the specified directory, or raise an appropriateexception.

The create method of the EnvBuilder class illustrates thehooks available for subclass customization:

Each of the methods ensure_directories(),create_configuration(), setup_python(),setup_scripts() and post_setup() can be overridden.

Create .env File In Ubuntu

Creates the environment directory and all necessary directories, andreturns a context object. This is just a holder for attributes (such aspaths), for use by the other methods. The directories are allowed toexist already, as long as either clear or upgrade werespecified to allow operating on an existing environment directory.

Creates the pyvenv.cfg configuration file in the environment.

Creates a copy or symlink to the Python executable in the environment.On POSIX systems, if a specific executable python3.x was used,symlinks to python and python3 will be created pointing to thatexecutable, unless files with those names already exist.

Installs activation scripts appropriate to the platform into the virtualenvironment.

Upgrades the core venv dependency packages (currently pip andsetuptools) in the environment. This is done by shelling out to thepip executable in the environment.

New in version 3.9.

A placeholder method which can be overridden in third partyimplementations to pre-install packages in the virtual environment orperform other post-creation steps.

Changed in version 3.7.2: Windows now uses redirector scripts for python[w].exe instead ofcopying the actual binaries. In 3.7.2 only setup_python() doesnothing unless running from a build in the source tree.

Changed in version 3.7.3: Windows copies the redirector scripts as part of setup_python()instead of setup_scripts(). This was not the case in 3.7.2.When using symlinks, the original executables will be linked.

In addition, EnvBuilder provides this utility method that can becalled from setup_scripts() or post_setup() in subclasses toassist in installing custom scripts into the virtual environment.

path is the path to a directory that should contain subdirectories“common”, “posix”, “nt”, each containing scripts destined for the bindirectory in the environment. The contents of “common” and thedirectory corresponding to os.name are copied after some textreplacement of placeholders:

• __VENV_DIR__ is replaced with the absolute path of the environmentdirectory.

• __VENV_NAME__ is replaced with the environment name (final pathsegment of environment directory).

• __VENV_PROMPT__ is replaced with the prompt (the environmentname surrounded by parentheses and with a following space)

• __VENV_BIN_NAME__ is replaced with the name of the bin directory(either bin or Scripts).

• __VENV_PYTHON__ is replaced with the absolute path of theenvironment’s executable.

The directories are allowed to exist (for when an existing environmentis being upgraded).

There is also a module-level convenience function:

Create an EnvBuilder with the given keyword arguments, and call itscreate() method with the env_dir argument.

Changed in version 3.4: Added the with_pip parameter

Changed in version 3.6: Added the prompt parameter

An example of extending EnvBuilder¶

Create An Env File In Python

The following script shows how to extend EnvBuilder by implementing asubclass which installs setuptools and pip into a created virtual environment:

Create .env File Windows

This script is also available for download online.