如何在Python 3中显示用户输入的文本作为不同的字符？

I'm trying to make a username and password program in Python, and although it isn't necessary to the final program, I thought it would be nice to make it display a different character when they input their text. Like most password fields, which may display something like an asterisk (*). So I was wondering how I might go about displaying their input as a different character. Thank you for any help :)I'm trying to make a username and password prog