哪位大哥解释一下为什么是if not？？？？？？

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#1 Created at ... [Delete] [Delete and Lock User]

为什么是if not data or data.decode('utf-8') == 'exit': break 为什么不是if data=='exit': break

#2 Created at ... [Delete] [Delete and Lock User]

if not data = if data is None

#3 Created at ... [Delete] [Delete and Lock User]

代码：


if not data:
    pass

意思就是："如果data为假，则执行pass"

#4 Created at ... [Delete] [Delete and Lock User]

第二个问题：应该是因为这里的data是bytes不是str，所以要decode 一下才能变成 'exit'