airflow/configuration.py
def expand_env_var(env_var):
    """
    Expands (potentially nested) env vars by repeatedly applying
    `expandvars` and `expanduser` until interpolation stops having
    any effect.
    """
    if not env_var:
        return env_var
    while True:
        interpolated = os.path.expanduser(os.path.expandvars(str(env_var)))
        if interpolated == env_var:
            return interpolated
        else:
            env_var = interpolated
def expand_env_var(env_var):
    """
    Expands (potentially nested) env vars by repeatedly applying
    `expandvars` and `expanduser` until interpolation stops having
    any effect.
    """
    if not env_var:
        return env_var
    while True:
        interpolated = os.path.expanduser(os.path.expandvars(str(env_var)))
        if interpolated == env_var:
            return interpolated
        else:
            env_var = interpolated
def expand_env_var ( env_var ) : if not env_var : return env_var while True : interpolated = os . path . expanduser ( os . path . expandvars ( str ( env_var ) ) ) if interpolated == env_var : return interpolated else : env_var = interpolated
Expands (potentially nested) env vars by repeatedly applying
    `expandvars` and `expanduser` until interpolation stops having
    any effect.
Expands ( potentially nested ) env vars by repeatedly applying expandvars and expanduser until interpolation stops having any effect .