用pip install升级已安装的包的附加包, 以tabulate包为例

用pip install升级已安装的附加包, 以tabulate包为例

去pypi官网查看tabulate包的介绍, 发现tabulate 0.7.6才开始支持宽字符的美化打印.

而且还需要安装它的附加包: widechars

然而我的机器里的tabulate的版本是0.7.5.

下面是升级步骤以及log记录:

pip install --upgrade tabulate

pip install tabulate[widechars]

C:\Documents and Settings\Administrator>pip help install

Usage:
  pip install [options] <requirement specifier> [package-index-options] ...
  pip install [options] -r <requirements file> [package-index-options] ...
  pip install [options] [-e] <vcs project url> ...
  pip install [options] [-e] <local project path> ...
  pip install [options] <archive url/path> ...

Description:
  Install packages from:

  - PyPI (and other indexes) using requirement specifiers.
  - VCS project urls.
  - Local project directories.
  - Local or remote source archives.

  pip also supports installing from "requirements files", which provide
  an easy way to specify a whole environment to be installed.

Install Options:
  -c, --constraint <file>     Constrain versions using the given constraints
                              file. This option can be used multiple times.
  -e, --editable <path/url>   Install a project in editable mode (i.e.
                              setuptools "develop mode") from a local project
                              path or a VCS url.
  -r, --requirement <file>    Install from the given requirements file. This
                              option can be used multiple times.
  -b, --build <dir>           Directory to unpack packages into and build in.
  -t, --target <dir>          Install packages into <dir>. By default this
                              will not replace existing files/folders in
                              <dir>. Use --upgrade to replace existing
                              packages in <dir> with new versions.
  -d, --download <dir>        Download packages into <dir> instead of
                              installing them, regardless of what's already
                              installed.
  --src <dir>                 Directory to check out editable projects into.
                              The default in a virtualenv is "<venv
                              path>/src". The default for global installs is
                              "<current dir>/src".
  -U, --upgrade               Upgrade all specified packages to the newest
                              available version. The handling of dependencies
                              depends on the upgrade-strategy used.

C:\Documents and Settings\Administrator>pip  install --upgrade tabulate
Collecting tabulate
  Downloading tabulate-0.7.7-py2.py3-none-any.whl
Installing collected packages: tabulate
  Found existing installation: tabulate 0.7.5
    Uninstalling tabulate-0.7.5:
      Successfully uninstalled tabulate-0.7.5
Successfully installed tabulate-0.7.7

C:\Documents and Settings\Administrator>pip  install tabulate[widechars]
Requirement already satisfied: tabulate[widechars] in d:\anaconda2\lib\site-packages
Collecting wcwidth; extra == "widechars" (from tabulate[widechars])
  Using cached wcwidth-0.1.7-py2.py3-none-any.whl
Installing collected packages: wcwidth
Successfully installed wcwidth-0.1.7