### Installing version_utils Python Package

Source: https://github.com/mplanchard/version_utils/blob/development/README.rst

This snippet demonstrates the simple installation process for the `version_utils` library using pip. Since it has no external dependencies, a direct pip install command is sufficient to add it to your Python environment.

```Shell
pip install version_utils
```

--------------------------------

### Comparing RPM Package Versions in Python

Source: https://github.com/mplanchard/version_utils/blob/development/README.rst

This example illustrates how to compare a required package version against an installed system package version using `version_utils.rpm`. It first retrieves the installed package string using `subprocess`, then parses it to extract version information, and finally uses `rpm.compare_versions` to determine if the system package meets the requirement.

```Python
from subprocess import PIPE, Popen
from version_utils import rpm

pkg_req = 1.07

# Get a package string for an installed package
out, err = Popen(['rpm', '-q', 'foo'], stdout=PIPE, stderr=PIPE).communicate()
sys_pkg_str = out

# Get package information
sys_package = rpm.package(sys_pkg_str)
sys_pkg_name = sys_package.name
sys_pkg_version = sys_package.version

# Compare versions
result = rpm.compare_versions(pkg_req, sys_pkg_version)

if result < 0:  # sys_pkg was newer
    print('System package {0} does not satisfy\n              requirement!'.format(sys_pkg_name))
```

--------------------------------

### Extracting RPM Package Information with Python's Package Class

Source: https://github.com/mplanchard/version_utils/blob/development/README.rst

This example demonstrates how to use the `rpm.package()` factory function to create a `Package` object from an RPM package string. The `Package` object provides convenient attributes like `info`, `package`, `evr`, `name`, `epoch`, `version`, `release`, and `arch` to access parsed package details.

```Python
from version_utils import rpm

pkg_str = 'pkgconfig-0.23-9.1.el6.x86_64'
pkg = rpm.package(pkg_str)

# Get package name, epoch, version, release, and architecture as a tuple
print(pkg.info)

# Access the package string that was parsed to make the Package object
print(pkg.package)

# Access the epoch, version, and release information as a tuple
print(pkg.evr)

# Access name, epoch, version, release, and architecture independently
print('Name: {0}, Epoch: {1}, Version: {2}, Release: {3}, Arch:\n          {4}'.format(pkg.name, pkg.epoch, pkg.version, pkg.release, pkg.arch))
```

--------------------------------

### Directly Comparing RPM Package Strings in Python

Source: https://github.com/mplanchard/version_utils/blob/development/README.rst

This snippet demonstrates the `rpm.compare_packages` function, which allows direct comparison of two full RPM package strings. It uses the same logic as the package manager to determine which package is newer, returning a positive value if the first package is newer, negative if the second is newer, and zero if they are equivalent.

```Python
from version_utils import rpm

sys_pkg = 'perl-Compress-Raw-Zlib-2.021-136.el6_6.1.x86_64'
repo_pkg = 'perl-Compress-Raw-Zlib-2.021-138.el6_6.1.x86_64'

result = rpm.compare_packages(repo_pkg, sys_pkg)

if result > 0:  # repo_pkg is newer
    print('Repo package is newer')
```

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