Dave Gray offers a solid, free Python tutorial that runs for about 9 hours. It’s a pretty methodical course, starting with the basics and moving into more complex stuff like closures and recursion. He ...

如 r"this is a line with \n" 则 \n 会显示，并不是换行。 字符串可以用 + 运算符连接在一起，用 * 运算符重复。 Python ...