python Oneline code，And和Or的妙用

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简单的If和Else：

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a = 4

if a > 3:
    if a > 4:
        j = ">4"
    else:
        j = "3< <=4"
else:
    j = "<=3"

# there are the same.
print(j)
print(a>3 and (a>4 and ">4" or "3< <=4") or "<=3")

这个If语句和下面的Or and 是一样的结果。

启动线程并同时保存到列表中

常规版：

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threadList = []
for i in range(5):
    newThread = threading.Thread(target=want)
    threadList.append(newThread)
    newThread.start()

One-line code:

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threadList = [t.start() or t for i in range(5) for t in [threading.Thread(target=want)]]