human
Complete the below
def env_config(config):

    ''''Return a new configuration with the values found in the environment.
    The function recursively iterates over the config, checking if there is
    a matching env variable. If an env variable is found, the func updates
    the configuration with that value.
    The name of the env variable is built combining a prefix (``BIGCHAINDB``)
    with the path to the value. If the ``config`` in input is:
    ``{\'database\': {\'host\': \'localhost\'}}``
    this function will try to read the env variable ``BIGCHAINDB_DATABASE_HOST``.'
    '''

Give me a Python code to fix (``BIGCHAINDB``)?
assistant
#Here is Python code to fix (``BIGCHAINDB``)
.
    def load_from_env(value, path):
        var_name = CONFIG_SEP.join(([CONFIG_PREFIX] + list(map((lambda s: s.upper()), path))))
        return os.environ.get(var_name, value)
    return map_leafs(load_from_env, config)