Sublime Text version 3.2.1, SublimeCodeIntel under Build 3207 meets the above requirements.

No additional configuration is required after installing the plug-in. Perference | Package Settings | SublimeCodeIntel | Settings-User check whether you correctly point to the Python installation path, for example:

{
    "python":{
        "python":"E:\\Python\\Python37\\python.exe",
        "pythonExtraPaths":[
            "E:\\Python\\Python37",
            "E:\\Python\\Python37\\DLLs",
            "E:\\Python\\Python37\\Lib",
            "E:\\Python\\Python37\\Lib\\site-packages",

        ]
    }
}

for the question scenario, SublimeCodeIntel has two smart tips:

• enter from test1 import and a prompt for importing variables appears in the space. You can select A directly from the list of prompts.
• member function prompts appear after entering A. , including custom test1 and default magic method

there may be delays without prompting directly. Try saving the current file