import importlib.util

def is_module_installed(module_name):
    # 尝试查找模块
    spec = importlib.util.find_spec(module_name)
    if spec is None:
        print(module_name + " 模块未安装")
        return False
    else:
        print(module_name + " 模块已安装")
        return True

# 测试一下
is_module_installed('pywebio')