Features

    Switch the default repository to the new "PyPI 2.0" running at https://pypi.org/. (#5214)

Bug Fixes

    Fix a bug that made get-pip.py unusable on Windows without renaming. (#5219)
    Fix a TypeError when loading the cache on older versions of Python 2.7. (#5231)
    Fix and improve error message when EnvironmentError occurs during installation. (#5237)
    A crash when reinstalling from VCS requirements has been fixed. (#5251)
    Fix PEP 518 support when pip is installed in the user site. (#5524)

Vendored Libraries

    Upgrade distlib to 0.2.7

10.0.0 (2018-04-14)
Bug Fixes

    Prevent false-positive installation warnings due to incomplete name normalizaton. (#5134)
    Fix issue where installing from Git with a short SHA would fail. (#5140)
    Accept pre-release versions when checking for conflicts with pip check or pip install. (#5141)
    ioctl(fd, termios.TIOCGWINSZ, ...) needs 8 bytes of data (#5150)
    Do not warn about script location when installing to the directory containing sys.executable. This is the case when 'pip install'ing without activating a virtualenv. (#5157)
    Fix PEP 518 support. (#5188)
    Don't warn about script locations if --target is specified. (#5203)

10.0.0b2 (2018-04-02)
Bug Fixes

    Fixed line endings in CA Bundle - 10.0.0b1 was inadvertently released with Windows line endings. (#5131)

10.0.0b1 (2018-03-31)
Deprecations and Removals

    Removed the deprecated --egg parameter to pip install. (#1749)
    Removed support for uninstalling projects which have been installed using distutils. distutils installed projects do not include metadata indicating what files belong to that install and thus it is impossible to actually uninstall them rather than just remove the metadata saying they've been installed while leaving all of the actual files behind. (#2386)
    Removed the deprecated --download option to pip install. (#2643)
    Removed the deprecated --(no-)use-wheel flags to pip install and pip wheel. (#2699)
    Removed the deprecated --allow-external, --allow-all-external, and --allow-unverified options. (#3070)
    Switch the default for pip list to the columns format, and deprecate the legacy format. (#3654, #3686)
    Deprecate support for Python 3.3. (#3796)
    Removed the deprecated --default-vcs option. (#4052)
    Removed the setup.py test support from our sdist as it wasn't being maintained as a supported means to run our tests. (#4203)
    Dropped support for Python 2.6. (#4343)
    Removed the --editable flag from pip download, as it did not make sense (#4362)
    Deprecate SVN detection based on dependency links in pip freeze. (#4449)
    Move all of pip's APIs into the pip._internal package, properly reflecting the fact that pip does not currently have any public APIs. (#4696, #4700)

Features

    Add --progress-bar <progress_bar> to pip download, pip install and pip wheel commands, to allow selecting a specific progress indicator or, to completely suppress, (for example in a CI environment) use --progress-bar off`. (#2369, #2756)
    Add --no-color to pip. All colored output is disabled if this flag is detected. (#2449)
    pip uninstall now ignores the absence of a requirement and prints a warning. (#3016, #4642)
    Improved the memory and disk efficiency of the HTTP cache. (#3515)
    Support for packages specifying build dependencies in pyproject.toml (see PEP 518). Packages which specify one or more build dependencies this way will be built into wheels in an isolated environment with those dependencies installed. (#3691)
    pip now supports environment variable expansion in requirement files using only ${VARIABLE} syntax on all platforms. (#3728)
    Allowed combinations of -q and -v to act sanely. Then we don't need warnings mentioned in the issue. (#4008)
    Add --exclude-editable to pip freeze and pip list to exclude editable packages from installed package list. (#4015, #4016)
    Improve the error message for the common pip install ./requirements.txt case. (#4127)
    Add support for the new @ url syntax from PEP 508. (#4175)
    Add setuptools version to the statistics sent to BigQuery. (#4209)
    Report the line which caused the hash error when using requirement files. (#4227)
    Add a pip config command for managing configuration files. (#4240)
    Allow pip download to be used with a specific platform when --no-deps is set. (#4289)
    Support build-numbers in wheel versions and support sorting with build-numbers. (#4299)
    Change pip outdated to use PackageFinder in order to do the version lookup so that local mirrors in Environments that do not have Internet connections can be used as the Source of Truth for latest version. (#4336)
    pip now retries on more HTTP status codes, for intermittent failures. Previously, it only retried on the standard 503. Now, it also retries on 500 (transient failures on AWS S3), 520 and 527 (transient failures on Cloudflare). (#4473)
    pip now displays where it is looking for packages, if non-default locations are used. (#4483)
    Display a message to run the right command for modifying pip on Windows (#4490)
    Add Man Pages for pip (#4491)
    Make uninstall command less verbose by default (#4493)
    Switch the default upgrade strategy to be 'only-if-needed' (#4500)
    Installing from a local directory or a VCS URL now builds a wheel to install, rather than running setup.py install. Wheels from these sources are not cached. (#4501)
    Don't log a warning when installing a dependency from Git if the name looks like a commit hash. (#4507)
    pip now displays a warning when it installs scripts from a wheel outside the PATH. These warnings can be suppressed using a new --no-warn-script-location option. (#4553)
    Local Packages can now be referenced using forward slashes on Windows. (#4563)
    pip show learnt a new Required-by field that lists currently installed packages that depend on the shown package (#4564)
    The command-line autocompletion engine pip show now autocompletes installed distribution names. (#4749)
    Change documentation theme to be in line with Python Documentation (#4758)
    Add auto completion of short options. (#4954)
    Run 'setup.py develop' inside pep518 build environment. (#4999)
    pip install now prints an error message when it installs an incompatible version of a dependency. (#5000)
    Added a way to distinguish between pip installed packages and those from the system package manager in 'pip list'. Specifically, 'pip list -v' also shows the installer of package if it has that meta data. (#949)
    Show install locations when list command ran with "-v" option. (#979)

Bug Fixes

    Allow pip to work if the GIT_DIR and GIT_WORK_TREE environment variables are set. (#1130)
    Make pip install --force-reinstall not require passing --upgrade. (#1139)
    Return a failing exit status when pip install, pip download, or pip wheel is called with no requirements. (#2720)
    Interactive setup.py files will no longer hang indefinitely. (#2732, #4982)
    Correctly reset the terminal if an exception occurs while a progress bar is being shown. (#3015)
    "Support URL-encoded characters in URL credentials." (#3236)
    Don't assume sys.__stderr__.encoding exists (#3356)
    Fix pip uninstall when easy-install.pth lacks a trailing newline. (#3741)
    Keep install options in requirements.txt from leaking. (#3763)
    pip no longer passes global options from one package to later packages in the same requirement file. (#3830)
    Support installing from Git refs (#3876)
    Use pkg_resources to parse the entry points file to allow names with colons. (#3901)
    -q specified once correctly sets logging level to WARNING, instead of CRITICAL. Use -qqq to have the previous behavior back. (#3994)
    Shell completion scripts now use correct executable names (e.g., pip3 instead of pip) (#3997)
    Changed vendored encodings from utf8 to utf-8. (#4076)
    Fixes destination directory of data_files when pip install --target is used. (#4092)
    Limit the disabling of requests' pyopenssl to Windows only. Fixes "SNIMissingWarning / InsecurePlatformWarning not fixable with pip 9.0 / 9.0.1" (for non-Windows) (#4098)
    Support the installation of wheels with non-PEP 440 version in their filenames. (#4169)
    Fall back to sys.getdefaultencoding() if locale.getpreferredencoding() returns None in pip.utils.encoding.auto_decode. (#4184)
    Fix a bug where SETUPTOOLS_SHIM got called incorrectly for relative path requirements by converting relative paths to absolute paths prior to calling the shim. (#4208)
    Return the latest version number in search results. (#4219)
    Improve error message on permission errors (#4233)
    Fail gracefully when /etc/image_version (or another distro version file) appears to exists but is not readable. (#4249)
    Avoid importing setuptools in the parent pip process, to avoid a race condition when upgrading one of setuptools dependencies. (#4264)
    Fix for an incorrect freeze warning message due to a package being included in multiple requirements files that were passed to freeze. Instead of warning incorrectly that the package is not installed, pip now warns that the package was declared multiple times and lists the name of each requirements file that contains the package in question. (#4293)
    Generalize help text for compile/no-compile flags. (#4316)
    Handle the case when /etc is not readable by the current user by using a hardcoded list of possible names of release files. (#4320)
    Fixed a NameError when attempting to catch FileNotFoundError on Python 2.7. (#4322)
    Ensure USER_SITE is correctly initialised. (#4437)
    Reinstalling an editable package from Git no longer assumes that the master branch exists. (#4448)
    This fixes an issue where when someone who tries to use git with pip but pip can't because git is not in the path environment variable. This clarifies the error given to suggest to the user what might be wrong. (#4461)
    Improve handling of text output from build tools (avoid Unicode errors) (#4486)
    Fix a "No such file or directory" error when using --prefix. (#4495)
    Allow commands to opt out of --require-venv. This allows pip help to work even when the environment variable PIP_REQUIRE_VIRTUALENV is set. (#4496)
    Fix warning message on mismatched versions during installation. (#4655)
    pip now records installed files in a deterministic manner improving reproducibility. (#4667)
    Fix an issue where pip install -e on a Git url would fail to update if a branch or tag name is specified that happens to match the prefix of the current HEAD commit hash. (#4675)
    Fix an issue where a variable assigned in a try clause was accessed in the except clause, resulting in an undefined variable error in the except clause. (#4811)
    Use log level info instead of warning when ignoring packages due to environment markers. (#4876)
    Replaced typo mistake in subversion support. (#4908)
    Terminal size is now correctly inferred when using Python 3 on Windows. (#4966)
    Abort if reading configuration causes encoding errors. (#4976)
    Add a --no-user option and use it when installing build dependencies. (#5085)

Vendored Libraries

    Upgraded appdirs to 1.4.3.
    Upgraded CacheControl to 0.12.3.
    Vendored certifi at 2017.7.27.1.
    Vendored chardet at 3.0.4.
    Upgraded colorama to 0.3.9.
    Upgraded distlib to 0.2.6.
    Upgraded distro to 1.2.0.
    Vendored idna at idna==2.6.
    Upgraded ipaddress to 1.0.18.
    Vendored msgpack-python at 0.4.8.
    Removed the vendored ordereddict.
    Upgraded progress to 1.3.
    Upgraded pyparsing to 2.2.0.
    Upgraded pytoml to 0.1.14.
    Upgraded requests to 2.18.4.
    Upgraded pkg_resources (via setuptools) to 36.6.0.
    Upgraded six to 1.11.0.
    Vendored urllib3 at 1.22.
    Upgraded webencodings to 0.5.1.

Improved Documentation

    Added documentation on usage of --build command line option (#4262)
    (#4358)
    Document how to call pip from your code, including the fact that we do not provide a Python API. (#4743)