def cache_installed_wheels(index_url, installed_packages):
for installed_package in installed_packages:<EOL><INDENT>if not _can_be_cached(installed_package):<EOL><INDENT>continue<EOL><DEDENT>_store_wheel_in_cache(installed_package.link.path, index_url)<EOL><DEDENT>
After installation, pip tells us what it installed and from where.

    We build a structure that looks like

    .cache/pip-faster/wheelhouse/$index_url/$wheel