def is_venv():
    """Check whether if this workspace is a virtualenv.
    """
    dir_path = os.path.dirname(SRC)
    is_venv_flag = True

    if SYS_NAME == "Windows":
        executable_list = ["activate", "pip.exe", "python.exe"]
    elif SYS_NAME in ["Darwin", "Linux"]:
        executable_list = ["activate", "pip", "python"]

    for executable in executable_list:
        path = os.path.join(dir_path, BIN_SCRIPTS, executable)
        if not os.path.exists(path):
            is_venv_flag = False

    return is_venv_flag