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Environment variables
uv defines and respects the following environment variables:
UV_BREAK_SYSTEM_PACKAGES
Since 0.1.32
Equivalent to the --break-system-packages command-line argument. If set to true,
uv will allow the installation of packages that conflict with system-installed packages.
WARNING: UV_BREAK_SYSTEM_PACKAGES=true is intended for use in continuous integration
(CI) or containerized environments and should be used with caution, as modifying the system
Python can lead to unexpected behavior.
UV_BUILD_CONSTRAINT
Since 0.2.34
Equivalent to the --build-constraint command-line argument. If set, uv will use this file
as constraints for any source distribution builds. Uses space-separated list of files.
UV_CACHE_DIR
Since 0.0.5
Equivalent to the --cache-dir command-line argument. If set, uv will use this
directory for caching instead of the default cache directory.
UV_COMPILE_BYTECODE
Since 0.3.3
Equivalent to the --compile-bytecode command-line argument. If set, uv
will compile Python source files to bytecode after installation.
UV_COMPILE_BYTECODE_TIMEOUT
Since 0.7.22
Timeout (in seconds) for bytecode compilation.
UV_CONCURRENT_BUILDS
Since 0.1.43
Sets the maximum number of source distributions that uv will build concurrently at any given time.
UV_CONCURRENT_DOWNLOADS
Since 0.1.43
Sets the maximum number of in-flight concurrent downloads that uv will perform at any given time.
UV_CONCURRENT_INSTALLS
Since 0.1.45
Controls the number of threads used when installing and unzipping packages.
UV_CONFIG_FILE
Since 0.1.34
Equivalent to the --config-file command-line argument. Expects a path to a
local uv.toml file to use as the configuration file.
UV_CONSTRAINT
Since 0.1.36
Equivalent to the --constraint command-line argument. If set, uv will use this
file as the constraints file. Uses space-separated list of files.
UV_CREDENTIALS_DIR
Since 0.8.15
The directory for storage of credentials when using a plain text backend.
UV_CUSTOM_COMPILE_COMMAND
Since 0.1.23
Equivalent to the --custom-compile-command command-line argument.
Used to override uv in the output header of the requirements.txt files generated by
uv pip compile. Intended for use-cases in which uv pip compile is called from within a wrapper
script, to include the name of the wrapper script in the output file.
UV_DEFAULT_INDEX
Since 0.4.23
Equivalent to the --default-index command-line argument. If set, uv will use
this URL as the default index when searching for packages.
UV_DEV
Since 0.8.7
Equivalent to the --dev command-line argument. If set, uv will include
development dependencies.
UV_DOWNLOAD_URL
Since 0.8.4
The URL from which to download uv using the standalone installer. By default, installs from
uv's GitHub Releases. INSTALLER_DOWNLOAD_URL is also supported as an alias, for backwards
compatibility.
UV_ENV_FILE
Since 0.4.30
.env files from which to load environment variables when executing uv run commands.
UV_EXCLUDE_NEWER
Since 0.2.12
Equivalent to the --exclude-newer command-line argument. If set, uv will
exclude distributions published after the specified date.
UV_EXTRA_INDEX_URL
Since 0.1.3
Equivalent to the --extra-index-url command-line argument. If set, uv will
use this space-separated list of URLs as additional indexes when searching for packages.
(Deprecated: use UV_INDEX instead.)
UV_FIND_LINKS
Since 0.4.19
Equivalent to the --find-links command-line argument. If set, uv will use this
comma-separated list of additional locations to search for packages.
UV_FORK_STRATEGY
Since 0.5.9
Equivalent to the --fork-strategy argument. Controls version selection during universal
resolution.
UV_FROZEN
Since 0.4.25
Equivalent to the --frozen command-line argument. If set, uv will run without
updating the uv.lock file.
UV_GITHUB_TOKEN
Since 0.4.10
Equivalent to the --token argument for self update. A GitHub token for authentication.
UV_GIT_LFS
Since 0.5.19
Enables fetching files stored in Git LFS when installing a package from a Git repository.
UV_HTTP_RETRIES
Since 0.7.21
The number of retries for HTTP requests. (default: 3)
UV_HTTP_TIMEOUT
Since 0.1.7
Timeout (in seconds) for HTTP requests. (default: 30 s)
UV_INDEX
Since 0.4.23
Equivalent to the --index command-line argument. If set, uv will use this
space-separated list of URLs as additional indexes when searching for packages.
UV_INDEX_STRATEGY
Since 0.1.29
Equivalent to the --index-strategy command-line argument.
For example, if set to unsafe-best-match, uv will consider versions of a given package
available across all index URLs, rather than limiting its search to the first index URL
that contains the package.
UV_INDEX_URL
Since 0.0.5
Equivalent to the --index-url command-line argument. If set, uv will use this
URL as the default index when searching for packages.
(Deprecated: use UV_DEFAULT_INDEX instead.)
UV_INDEX_{name}_PASSWORD
Since 0.4.23
Provides the HTTP Basic authentication password for a named index.
The name parameter is the name of the index. For example, given an index named foo,
the environment variable key would be UV_INDEX_FOO_PASSWORD.
UV_INDEX_{name}_USERNAME
Since 0.4.23
Provides the HTTP Basic authentication username for a named index.
The name parameter is the name of the index. For example, given an index named foo,
the environment variable key would be UV_INDEX_FOO_USERNAME.
UV_INIT_BUILD_BACKEND
Since 0.8.2
Equivalent to the --build-backend argument for uv init. Determines the default backend
to use when creating a new project.
UV_INSECURE_HOST
Since 0.3.5
Equivalent to the --allow-insecure-host argument.
UV_INSECURE_NO_ZIP_VALIDATION
Since 0.8.6
Disable ZIP validation for streamed wheels and ZIP-based source distributions.
WARNING: Disabling ZIP validation can expose your system to security risks by bypassing integrity checks and allowing uv to install potentially malicious ZIP files. If uv rejects a ZIP file due to failing validation, it is likely that the file is malformed; consider filing an issue with the package maintainer.
UV_INSTALLER_GHE_BASE_URL
Since 0.5.0
The URL from which to download uv using the standalone installer and self update feature,
in lieu of the default GitHub Enterprise URL.
UV_INSTALLER_GITHUB_BASE_URL
Since 0.5.0
The URL from which to download uv using the standalone installer and self update feature,
in lieu of the default GitHub URL.
UV_INSTALL_DIR
Since 0.5.0
The directory in which to install uv using the standalone installer and self update feature.
Defaults to ~/.local/bin.
UV_ISOLATED
Since 0.8.14
Equivalent to the --isolated command-line argument. If set, uv will avoid discovering
a pyproject.toml or uv.toml file.
UV_KEYRING_PROVIDER
Since 0.1.19
Equivalent to the --keyring-provider command-line argument. If set, uv
will use this value as the keyring provider.
UV_LIBC
Since 0.7.22
Overrides the environment-determined libc on linux systems when filling in the current platform
within Python version requests. Options are: gnu, gnueabi, gnueabihf, musl, and none.
UV_LINK_MODE
Since 0.1.40
Equivalent to the --link-mode command-line argument. If set, uv will use this as
a link mode.
UV_LOCKED
Since 0.4.25
Equivalent to the --locked command-line argument. If set, uv will assert that the
uv.lock remains unchanged.
UV_LOG_CONTEXT
Since 0.6.4
Add additional context and structure to log messages.
If logging is not enabled, e.g., with RUST_LOG or -v, this has no effect.
UV_MANAGED_PYTHON
Since 0.6.8
Require use of uv-managed Python versions.
UV_NATIVE_TLS
Since 0.1.19
Equivalent to the --native-tls command-line argument. If set to true, uv will
use the system's trust store instead of the bundled webpki-roots crate.
UV_NO_BINARY
Since 0.5.30
Equivalent to the --no-binary command-line argument. If set, uv will install
all packages from source. The resolver will still use pre-built wheels to
extract package metadata, if available.
UV_NO_BINARY_PACKAGE
Since 0.5.30
Equivalent to the --no-binary-package command line argument. If set, uv will
not use pre-built wheels for the given space-delimited list of packages.
UV_NO_BUILD
Since 0.1.40
Equivalent to the --no-build command-line argument. If set, uv will not build
source distributions.
UV_NO_BUILD_ISOLATION
Since 0.1.40
Equivalent to the --no-build-isolation command-line argument. If set, uv will
skip isolation when building source distributions.
UV_NO_BUILD_PACKAGE
Since 0.6.5
Equivalent to the --no-build-package command line argument. If set, uv will
not build source distributions for the given space-delimited list of packages.
UV_NO_CACHE
Since 0.1.2
Equivalent to the --no-cache command-line argument. If set, uv will not use the
cache for any operations.
UV_NO_CONFIG
Since 0.2.30
Equivalent to the --no-config command-line argument. If set, uv will not read
any configuration files from the current directory, parent directories, or user configuration
directories.
UV_NO_DEV
Since 0.8.7
Equivalent to the --no-dev command-line argument. If set, uv will exclude
development dependencies.
UV_NO_EDITABLE
Since 0.6.15
Equivalent to the --no-editable command-line argument. If set, uv
installs or exports any editable dependencies, including the project and any workspace
members, as non-editable.
UV_NO_ENV_FILE
Since 0.4.30
Ignore .env files when executing uv run commands.
UV_NO_GITHUB_FAST_PATH
Since 0.7.13
Disable GitHub-specific requests that allow uv to skip git fetch in some circumstances.
UV_NO_HF_TOKEN
Since 0.8.1
Disable Hugging Face authentication, even if HF_TOKEN is set.
UV_NO_INSTALLER_METADATA
Since 0.5.7
Skip writing uv installer metadata files (e.g., INSTALLER, REQUESTED, and direct_url.json) to site-packages .dist-info directories.
UV_NO_MANAGED_PYTHON
Since 0.6.8
Disable use of uv-managed Python versions.
UV_NO_MODIFY_PATH
Since 0.8.4
Avoid modifying the PATH environment variable when installing uv using the standalone
installer and self update feature. INSTALLER_NO_MODIFY_PATH is also supported as an
alias, for backwards compatibility.
UV_NO_PROGRESS
Since 0.2.28
Equivalent to the --no-progress command-line argument. Disables all progress output. For
example, spinners and progress bars.
UV_NO_SYNC
Since 0.4.18
Equivalent to the --no-sync command-line argument. If set, uv will skip updating
the environment.
UV_NO_VERIFY_HASHES
Since 0.5.3
Equivalent to the --no-verify-hashes argument. Disables hash verification for
requirements.txt files.
UV_NO_WRAP
Since 0.0.5
Use to disable line wrapping for diagnostics.
UV_OFFLINE
Since 0.5.9
Equivalent to the --offline command-line argument. If set, uv will disable network access.
UV_OVERRIDE
Since 0.2.22
Equivalent to the --override command-line argument. If set, uv will use this file
as the overrides file. Uses space-separated list of files.
UV_PRERELEASE
Since 0.1.16
Equivalent to the --prerelease command-line argument. For example, if set to
allow, uv will allow pre-release versions for all dependencies.
UV_PREVIEW
Since 0.1.37
Equivalent to the --preview argument. Enables preview mode.
UV_PREVIEW_FEATURES
Since 0.8.4
Equivalent to the --preview-features argument. Enables specific preview features.
UV_PROJECT
Since 0.4.4
Equivalent to the --project command-line argument.
UV_PROJECT_ENVIRONMENT
Since 0.4.4
Specifies the path to the directory to use for a project virtual environment.
See the project documentation for more details.
UV_PUBLISH_CHECK_URL
Since 0.4.30
Don't upload a file if it already exists on the index. The value is the URL of the index.
UV_PUBLISH_INDEX
Since 0.5.8
Equivalent to the --index command-line argument in uv publish. If
set, uv the index with this name in the configuration for publishing.
UV_PUBLISH_PASSWORD
Since 0.4.16
Equivalent to the --password command-line argument in uv publish. If
set, uv will use this password for publishing.
UV_PUBLISH_TOKEN
Since 0.4.16
Equivalent to the --token command-line argument in uv publish. If set, uv
will use this token (with the username __token__) for publishing.
UV_PUBLISH_URL
Since 0.4.16
Equivalent to the --publish-url command-line argument. The URL of the upload
endpoint of the index to use with uv publish.
UV_PUBLISH_USERNAME
Since 0.4.16
Equivalent to the --username command-line argument in uv publish. If
set, uv will use this username for publishing.
UV_PYPY_INSTALL_MIRROR
Since 0.2.35
Managed PyPy installations are downloaded from python.org.
This variable can be set to a mirror URL to use a
different source for PyPy installations. The provided URL will replace
https://downloads.python.org/pypy in, e.g.,
https://downloads.python.org/pypy/pypy3.8-v7.3.7-osx64.tar.bz2.
Distributions can be read from a local directory by using the file:// URL scheme.
UV_PYTHON
Since 0.1.40
Equivalent to the --python command-line argument. If set to a path, uv will use
this Python interpreter for all operations.
UV_PYTHON_BIN_DIR
Since 0.4.29
Specifies the directory to place links to installed, managed Python executables.
UV_PYTHON_CACHE_DIR
Since 0.7.0
Specifies the directory for caching the archives of managed Python installations before installation.
UV_PYTHON_CPYTHON_BUILD
Since 0.8.14
Pin managed CPython versions to a specific build version.
For CPython, this should be the build date (e.g., "20250814").
UV_PYTHON_DOWNLOADS
Since 0.3.2
Equivalent to the
python-downloads setting and, when disabled, the
--no-python-downloads option. Whether uv should allow Python downloads.
UV_PYTHON_DOWNLOADS_JSON_URL
Since 0.6.13
Managed Python installations information is hardcoded in the uv binary.
This variable can be set to a URL pointing to JSON to use as a list for Python installations. This will allow for setting each property of the Python installation, mostly the url part for offline mirror.
Note that currently, only local paths are supported.
UV_PYTHON_GRAALPY_BUILD
Since 0.8.14
Pin managed GraalPy versions to a specific build version.
For GraalPy, this should be the GraalPy version (e.g., "24.2.2").
UV_PYTHON_INSTALL_BIN
Since 0.8.0
Whether to install the Python executable into the UV_PYTHON_BIN_DIR directory.
UV_PYTHON_INSTALL_DIR
Since 0.2.22
Specifies the directory for storing managed Python installations.
UV_PYTHON_INSTALL_MIRROR
Since 0.2.35
Managed Python installations are downloaded from the Astral
python-build-standalone project.
This variable can be set to a mirror URL to use a different source for Python installations.
The provided URL will replace https://github.com/astral-sh/python-build-standalone/releases/download in, e.g.,
https://github.com/astral-sh/python-build-standalone/releases/download/20240713/cpython-3.12.4%2B20240713-aarch64-apple-darwin-install_only.tar.gz.
Distributions can be read from a local directory by using the file:// URL scheme.
UV_PYTHON_INSTALL_REGISTRY
Since 0.8.0
Whether to install the Python executable into the Windows registry.
UV_PYTHON_PREFERENCE
Since 0.3.2
Whether uv should prefer system or managed Python versions.
UV_PYTHON_PYODIDE_BUILD
Since 0.8.14
Pin managed Pyodide versions to a specific build version.
For Pyodide, this should be the Pyodide version (e.g., "0.28.1").
UV_PYTHON_PYPY_BUILD
Since 0.8.14
Pin managed PyPy versions to a specific build version.
For PyPy, this should be the PyPy version (e.g., "7.3.20").
UV_REQUEST_TIMEOUT
Since 0.1.6
Timeout (in seconds) for HTTP requests. Equivalent to UV_HTTP_TIMEOUT.
UV_REQUIRE_HASHES
Since 0.1.34
Equivalent to the --require-hashes command-line argument. If set to true,
uv will require that all dependencies have a hash specified in the requirements file.
UV_RESOLUTION
Since 0.1.27
Equivalent to the --resolution command-line argument. For example, if set to
lowest-direct, uv will install the lowest compatible versions of all direct dependencies.
UV_STACK_SIZE
Since 0.0.5
Use to set the stack size used by uv.
The value is in bytes, and if both UV_STACK_SIZE are RUST_MIN_STACK unset, uv uses a 4MB
(4194304) stack. UV_STACK_SIZE takes precedence over RUST_MIN_STACK.
Unlike the normal RUST_MIN_STACK semantics, this can affect main thread
stack size, because we actually spawn our own main2 thread to work around
the fact that Windows' real main thread is only 1MB. That thread has size
max(UV_STACK_SIZE, 1MB).
UV_SYSTEM_PYTHON
Since 0.1.18
Equivalent to the --system command-line argument. If set to true, uv will
use the first Python interpreter found in the system PATH.
WARNING: UV_SYSTEM_PYTHON=true is intended for use in continuous integration (CI)
or containerized environments and should be used with caution, as modifying the system
Python can lead to unexpected behavior.
UV_TEST_NO_HTTP_RETRY_DELAY
Since 0.7.21
Used to disable delay for HTTP retries in tests.
UV_TOOL_BIN_DIR
Since 0.3.0
Specifies the "bin" directory for installing tool executables.
UV_TOOL_DIR
Since 0.2.16
Specifies the directory where uv stores managed tools.
UV_TORCH_BACKEND
Since 0.6.9
Equivalent to the --torch-backend command-line argument (e.g., cpu, cu126, or auto).
UV_UNMANAGED_INSTALL
Since 0.5.0
Used ephemeral environments like CI to install uv to a specific path while preventing the installer from modifying shell profiles or environment variables.
UV_VENV_CLEAR
Since 0.8.0
Equivalent to the --clear command-line argument. If set, uv will remove any
existing files or directories at the target path.
UV_VENV_SEED
Since 0.5.21
Install seed packages (one or more of: pip, setuptools, and wheel) into the virtual environment
created by uv venv.
Note that setuptools and wheel are not included in Python 3.12+ environments.
Externally defined variables
uv also reads the following externally defined environment variables:
ALL_PROXY
Since 0.1.38
General proxy for all network requests.
ANDROID_API_LEVEL
Since 0.8.16
Used with --python-platform aarch64-linux-android and related variants to set the
Android API level. (i.e., the minimum supported Android API level).
Defaults to 24.
APPDATA
Since 0.1.42
Path to user-level configuration directory on Windows systems.
BASH_VERSION
Since 0.1.28
Used to detect Bash shell usage.
CLICOLOR_FORCE
Since 0.1.32
Use to control color via anstyle.
COLUMNS
Since 0.6.2
Overrides terminal width used for wrapping. This variable is not read by uv directly.
This is a quasi-standard variable, described, e.g., in ncurses(3x).
CONDA_DEFAULT_ENV
Since 0.5.0
Used to determine the name of the active Conda environment.
CONDA_PREFIX
Since 0.0.5
Used to detect the path of an active Conda environment.
CONDA_ROOT
Since 0.8.18
Used to determine the root install path of Conda.
FISH_VERSION
Since 0.1.28
Used to detect Fish shell usage.
FORCE_COLOR
Since 0.2.7
Forces colored output regardless of terminal support.
See force-color.org.
GITHUB_ACTIONS
Since 0.4.16
Indicates that the current process is running in GitHub Actions.
uv publish may attempt trusted publishing flows when set
to true.
GITLAB_CI
Since 0.8.18
Indicates that the current process is running in GitLab CI.
uv publish may attempt trusted publishing flows when set
to true.
HF_TOKEN
Since 0.8.1
Authentication token for Hugging Face requests. When set, uv will use this token
when making requests to https://huggingface.co/ and any subdomains.
HOME
Since 0.0.5
The standard HOME env var.
HTTPS_PROXY
Since 0.1.38
Proxy for HTTPS requests.
HTTP_PROXY
Since 0.1.38
Proxy for HTTP requests.
HTTP_TIMEOUT
Since 0.1.7
Timeout (in seconds) for HTTP requests. Equivalent to UV_HTTP_TIMEOUT.
IPHONEOS_DEPLOYMENT_TARGET
Since 0.8.16
Used with --python-platform arm64-apple-ios and related variants to set the
deployment target (i.e., the minimum supported iOS version).
Defaults to 13.0.
JPY_SESSION_NAME
Since 0.2.6
Used to detect when running inside a Jupyter notebook.
KSH_VERSION
Since 0.2.33
Used to detect Ksh shell usage.
LOCALAPPDATA
Since 0.3.3
Used to look for Microsoft Store Pythons installations.
MACOSX_DEPLOYMENT_TARGET
Since 0.1.42
Used with --python-platform macos and related variants to set the
deployment target (i.e., the minimum supported macOS version).
Defaults to 13.0, the least-recent non-EOL macOS version at time of writing.
NETRC
Since 0.1.16
Use to set the .netrc file location.
NO_COLOR
Since 0.2.7
Disables colored output (takes precedence over FORCE_COLOR).
See no-color.org.
NO_PROXY
Since 0.1.38
Comma-separated list of hostnames (e.g., example.com) and/or patterns (e.g., 192.168.1.0/24) that should bypass the proxy.
NU_VERSION
Since 0.1.16
Used to detect NuShell usage.
PAGER
Since 0.4.18
The standard PAGER posix env var. Used by uv to configure the appropriate pager.
PATH
Since 0.0.5
The standard PATH env var.
PROMPT
Since 0.1.16
Used to detect the use of the Windows Command Prompt (as opposed to PowerShell).
PWD
Since 0.0.5
The standard PWD posix env var.
PYC_INVALIDATION_MODE
Since 0.1.7
The validation modes to use when run with --compile.
See PycInvalidationMode.
PYTHONPATH
Since 0.1.22
Adds directories to Python module search path (e.g., PYTHONPATH=/path/to/modules).
PYX_API_KEY
Since 0.8.15
The pyx API key (e.g., sk-pyx-...).
PYX_API_URL
Since 0.8.15
The URL of the pyx Simple API server.
PYX_AUTH_TOKEN
Since 0.8.15
The pyx authentication token (e.g., eyJhbGciOiJSUzI1NiIsInR5cCI6IkpXVCJ9...), as output by uv auth token.
PYX_CDN_DOMAIN
Since 0.8.15
The domain of the pyx CDN.
PYX_CREDENTIALS_DIR
Since 0.8.15
Specifies the directory where uv stores pyx credentials.
RUST_BACKTRACE
Since 0.7.22
If set, it can be used to display more stack trace details when a panic occurs. This is used by uv particularly on windows to show more details during a platform exception.
For example:
RUST_BACKTRACE=1will print a short backtrace.RUST_BACKTRACE=fullwill print a full backtrace.
See the Rust backtrace documentation for more.
RUST_LOG
Since 0.0.5
If set, uv will use this value as the log level for its --verbose output. Accepts
any filter compatible with the tracing_subscriber crate.
For example:
RUST_LOG=uv=debugis the equivalent of adding--verboseto the command lineRUST_LOG=tracewill enable trace-level logging.
See the tracing documentation for more.
RUST_MIN_STACK
Since 0.5.19
Use to set the stack size used by uv.
The value is in bytes, and if both UV_STACK_SIZE are RUST_MIN_STACK unset, uv uses a 4MB
(4194304) stack. UV_STACK_SIZE takes precedence over RUST_MIN_STACK.
Prefer setting UV_STACK_SIZE, since RUST_MIN_STACK also affects subprocesses, such as
build backends that use Rust code.
Unlike the normal RUST_MIN_STACK semantics, this can affect main thread
stack size, because we actually spawn our own main2 thread to work around
the fact that Windows' real main thread is only 1MB. That thread has size
max(RUST_MIN_STACK, 1MB).
SHELL
Since 0.1.16
The standard SHELL posix env var.
SSL_CERT_FILE
Since 0.1.14
Custom certificate bundle file path for SSL connections.
SSL_CLIENT_CERT
Since 0.2.11
If set, uv will use this file for mTLS authentication. This should be a single file containing both the certificate and the private key in PEM format.
SYSTEMDRIVE
Since 0.4.26
Path to system-level configuration directory on Windows systems.
TRACING_DURATIONS_FILE
Since 0.0.5
Use to create the tracing durations file via the tracing-durations-export feature.
USERPROFILE
Since 0.0.5
Path to root directory of user's profile on Windows systems.
UV
Since 0.6.0
The path to the binary that was used to invoke uv.
This is propagated to all subprocesses spawned by uv.
If the executable was invoked through a symbolic link, some platforms will return the path of the symbolic link and other platforms will return the path of the symbolic link’s target.
See https://doc.rust-lang.org/std/env/fn.current_exe.html#security for security considerations.
VIRTUAL_ENV
Since 0.0.5
Used to detect an activated virtual environment.
VIRTUAL_ENV_DISABLE_PROMPT
Since 0.0.5
If set to 1 before a virtual environment is activated, then the
virtual environment name will not be prepended to the terminal prompt.
XDG_BIN_HOME
Since 0.2.16
Path to directory where executables are installed.
XDG_CACHE_HOME
Since 0.1.17
Path to cache directory on Unix systems.
XDG_CONFIG_DIRS
Since 0.4.26
Path to system-level configuration directory on Unix systems.
XDG_CONFIG_HOME
Since 0.1.34
Path to user-level configuration directory on Unix systems.
XDG_DATA_HOME
Since 0.2.16
Path to directory for storing managed Python installations and tools.
ZDOTDIR
Since 0.2.25
Used to determine which .zshenv to use when Zsh is being used.
ZSH_VERSION
Since 0.1.28
Used to detect Zsh shell usage.