你按键盘时，甚至可以发出点击的轻微的噪音。
You can actually press the keys, and it even makes a small kind of clicking noise.
当键入if语句和终止的冒号，并按键盘上的回车键时，Python解释器就知道您输入了一个复合语句。
When you type in the if statement and the terminating colon, then press Return (or enter) on your keyboard, the Python interpreter realizes you have entered a compound statement.
关闭文件时要同时按键盘上的CTRL键和W键。
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