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Solve the following problem using Python, implementing the functions described below, one line at a time
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Description:

def show_env():
    '''
    Show Environment used by Oracle Client

    CLI Example:

    .. code-block:: bash

        salt '*' oracle.show_env

    .. note::
        at first _connect() ``NLS_LANG`` will forced to '.AL32UTF8'
    '''
    envs = ['PATH', 'ORACLE_HOME', 'TNS_ADMIN', 'NLS_LANG']
    result = {}
    for env in envs:
        if env in os.environ:
            result[env] = os.environ[env]
    return result