Packages in Python

Overview of PIP Command

The pip command is a tool for installing and managing Python packages, such as those found in the Python Package Index. You can do the operations related to the pip from command prompt. To install any package through pip is very easy. Before installing any package pip should be installed. For the older version it should be installed manually but for the latest versions pip is inbuilt.

Go to the command prompt and practice these, for installing packages the Internet connection is required.

Usage:
  pip <command> [options]
Commands:
  install                     Install packages.
  download                    Download packages.
  uninstall                   Uninstall packages.
  freeze                      Output installed packages in requirements format.
  list                        List installed packages.
  show                        Show information about installed packages.
  check                       Verify installed packages have compatible dependencies.
  search                      Search PyPI for packages.
  wheel                       Build wheels from your requirements.
  hash                        Compute hashes of package archives.
  completion                  A helper command used for command completion.
  help                        Show help for commands.
General Options:
  -h, --help                  Show help.
  --isolated                  Run pip in an isolated mode, ignoring
                              environment variables and user configuration.
  -v, --verbose               Give more output. Option is additive, and can be
                              used up to 3 times.

E:\Python35>pip download xlrd

E:\Python35>pip install xlrd

Freeze: To launch python from anywhere.

Verify a successful installation by opening a command prompt window and navigating to your Python installation’s script directory (default is C:\Python35\Scripts). Type pip freeze from this location to launch the Python interpreter.   pip freeze displays the version number of all modules installed in your Python non-standard library; On a fresh install, pip freeze probably won’t have much info to show but we’re more interested in any errors that might pop up here than the actual content.

E:\Python35>c:

C:\>pip search xlrd

xlrd-with-formulas (1.0.0)  - Library for developers to extract data from
                              Microsoft Excel (tm) spreadsheet files
pythonetl-xlrd (0.9.3dev)   - Library for developers to extract data from
                              Microsoft Excel (tm) spreadsheet files
xleditor (0.95)             - Easy to open xls/xlsx file and edit it (merge
                              xlrd and xlutils)
xlrd (1.1.0)                - Library for developers to extract data from
                              Microsoft Excel (tm) spreadsheet files
  INSTALLED: 1.0.0
  LATEST:    1.1.0
xlsimport (0.1)             - Builton top of xlrd, package provides set of
                              cell parsers that make your import easier.
xlutils (2.0.0)             - Utilities for working with Excel files that
                              require both xlrd and xlwt

C:\>pip show xlrd

C:\>pip install coverage

C:\>pip show coverage

C:\>pip search coverage

C:\>pip uninstall coverage

E:\Python35>pip wheel xlrd

Skipping xlrd, due to already being wheel.

Unofficial Windows Binaries for Python Extension Packages

We can get all the unofficial wheel files from the following link to install the packages.

Link for wheels: https://www.lfd.uci.edu/~gohlke/pythonlibs/

It is important to get the correct wheel file related to your python version. Search the “coverage” wheel and download the file related to your python version.

I have selected  coverage‑4.5.1‑cp35‑cp35m‑win_amd64.whl file and downloaded in to the scripts folder in python.

To install this file go to the corresponding folder and then write the following command.

E:\Python35>cd scripts

E:\Python35\Scripts>pip install “coverage-4.5.1-cp35-cp35m-win_amd64.whl”

E:\Python35\Scripts>pip show coverage

In this way you can download the wheel files according to your requirements. The procedure is same for all the other wheels. If the version is not supported then it will not be installed and give an error.

Upgrading the pip:

To upgrade the version of pip you can use the following command at the command prompt.

python -m pip install -U pip

Pip list:

E:\Python35>pip list

E:\Python35>pip list –format columns

Package                Version
---------------------- ----------
attrs                  17.4.0
bleach                 1.5.0
certifi                2017.11.5
chardet                3.0.4
colorama               0.3.9
common                 0.1.2
……	

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