<SYSTEM_TASK:>
Solve the following problem using Python, implementing the functions described below, one line at a time
<END_TASK>
<USER_TASK:>
Description:
 def get_version(package_name, version_file='_version.py'):
 """Retrieve the package version from a version file in the package root."""

    filename = os.path.join(os.path.dirname(__file__), package_name, version_file)
    with open(filename, 'rb') as fp:
        return fp.read().decode('utf8').split('=')[1].strip(" \n'")