More about pip and virtualenv

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More about pip and virtualenv

More about virtualenv and virtualenvwrapper

Deleting a virtualenv is as simple as creating one. To delete a
virtualenv, at the terminal, type rmvirtualenv followed
by the name of the virtualenv that you’d like to remove, like so:

rmvirtualenv TestEnv

The above command will delete the virtualenv TestEnv,
that we created earlier.

Another useful command is lsvirtualenv, which lists all
of the virtual environments that we have created so far.

If you’d like to learn more about virtual environments, we strongly
recommend going through
the section about virtualenvs
in the book
The Hitchhiker’s Guide to Python!
.

For a full list of virtualenvwrapper commands, go

here
.

More about pip

You can also use pip to search the
Python Package Index (PyPI)
for packages. For instance, to search for a
package that allows you to work with HTTP, type,

pip search http

or maybe, to search for packages related to
matplotlib
, a Python 2D plotting library, type:

pip search matplotlib

If you find yourself installing the same package frequently in virtualenvs,
it quickly becomes a pain to wait for pip to download the package again on every
separate install. The
pip wheel
command can be used here. Here’s the syntax:

pip wheel foo
pip install foo

where foo is the name of the package to install.

The pip wheel command above downloads the package
foo
from PyPI and
keeps it in a special directory of its own. After that, whenever
you try and install the same package foo, pip will skip
the downloading phase and install it using the the file saved by
pip wheel.

This may not seem like a big deal for small packages, but for large
packages like matplotlib, which is roughly 48 megabytes in size,
pip wheel
can save you a lot of time.

You can learn more about pip
here.