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Commit 3c8497a

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Python matrix
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‎taiyangxue/README.md‎

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- [showdata](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/showdata) : Flask + echarts 轻松搞定 nginx 日志可视化
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- [dice](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/dice) : 做硬核老爸,我用 Python
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- [python39](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/python39) : 你在享受十一长假时,Python 已悄悄地变了
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- [matrix](https://github.com/JustDoPython/python-examples/tree/master/taiyangxue/matrix) : Python 世界的黑客帝国
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‎taiyangxue/matrix/chain.py‎

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# 命令行下执行
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# 思考下下面表达式的值
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(False == False) in [False] # 合乎常理
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False == (False in [False]) # 也没问题
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False == False in [False] # 现在感觉如何?
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True is False == False
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False is False is False
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1 > 0 < 1
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(1 > 0) < 1
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1 > (0 < 1)

‎taiyangxue/matrix/eatjs.py‎

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some_dict = {}
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some_dict[5.5] = "Ruby"
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some_dict[5.0] = "JavaScript"
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some_dict[5] = "Python"
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print(some_dict[5.5]) # Ruby
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print(some_dict[5.0]) # Python Javascript 去哪了

‎taiyangxue/matrix/is.py‎

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# 命令行下执行
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a = 256
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b = 256
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a is b # 值是什么
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a = 257
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b = 257
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a is b # 值是什么
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a = []
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b = []
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a is b # 值是什么
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a = tuple()
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b = tuple()
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a is b # 值是什么

‎taiyangxue/matrix/sting.py‎

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# 命令行下执行
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a = "some_string"
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id(a)
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id("some" + "_" + "string") # 不同方式创建的字符串实质是一样的.
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a = "wtf"
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b = "wtf"
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a is b # 想想结果是什么
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a = "wtf!"
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b = "wtf!"
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a is b # 结果又会是什么

‎taiyangxue/matrix/walrus.py‎

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# 海象操作符
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a = [1,2,3,4,5]
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if n := len(n) > 4:
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print(n)
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# 命令行中执行
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a = "wtf_walrus"
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a := "wtf_walrus" # 报错!
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(a := "wtf_walrus") # 奇迹发生,竟然通过了!
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a = 6, 9 # 元组赋值
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(a := 6, 9) # 海象赋值,表达式结果正常
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# 现在 a 的值是多少?
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a, b = 6, 9 # 解包赋值
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(a, b = 16, 19) # Oh no!
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(a, b := 16, 19) # 这里竟然打印出三员元组!
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# 现在的 a 是多少?

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