4zhvml8 发表于 2024-8-18 11:12:00

Python能做的5件有趣的事情,这些操作你都会吗?


    <div style="color: black; text-align: left; margin-bottom: 10px;">
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">此刻</span>Python越来越受程序员欢迎了,程序员用Python<span style="color: black;">能够</span>做<span style="color: black;">那些</span>有趣的事情呢?</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">下面w3cschool就给小伙伴们介绍一下Python编程的5件趣事:</p>
      <h1 style="color: black; text-align: left; margin-bottom: 10px;">0.for-else用法</h1>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">循环正常结束则执行else语句。<span style="color: black;">通常</span>用于循环找符合<span style="color: black;">要求</span>的元素,<span style="color: black;">倘若</span>找到则break调出循环,不会触发else;<span style="color: black;">倘若</span><span style="color: black;">无</span>找到(完整运行循环)则print not found</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://p3-sign.toutiaoimg.com/pgc-image/1525090590524d4ee50f85d~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1723903905&amp;x-signature=V4vduQAkwuOSsb0019k4CMo3hvQ%3D" style="width: 50%; margin-bottom: 20px;"></p>
      <h1 style="color: black; text-align: left; margin-bottom: 10px;">1.or的用法</h1>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">python中x or y<span style="color: black;">暗示</span><span style="color: black;">倘若</span>x为真<span style="color: black;">便是</span>x的值,否则为y的值</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">咱们</span>会经常看到类似<span style="color: black;">这般</span>的用法(<span style="color: black;">例如</span>函数的一个value参数<span style="color: black;">无</span>设置默认值,<span style="color: black;">这般</span><span style="color: black;">运用</span>就<span style="color: black;">准许</span>它不赋值)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">value = value or {}</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 相当于</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">value = value if value else {}</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://p26-sign.toutiaoimg.com/pgc-image/1525090636254a0312f3835~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1723903905&amp;x-signature=QerP5gfYPZ%2BmywSMowgqldRMt4g%3D" style="width: 50%; margin-bottom: 20px;"></p>
      <h1 style="color: black; text-align: left; margin-bottom: 10px;">2.and的用法</h1>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">python中x and y<span style="color: black;">暗示</span><span style="color: black;">倘若</span>x是假,结果<span style="color: black;">便是</span>x的值,否则<span style="color: black;">便是</span>y的值</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">x and y and z多个and连接时,<span style="color: black;">倘若</span>全是真结果<span style="color: black;">便是</span>最后一个的值;<span style="color: black;">倘若</span>中间有假的值,结果<span style="color: black;">便是</span><span style="color: black;">第1</span>个假的值</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">举一个例子</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">def not_empty(a):</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">return a and a.strip()</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">not_empty( a )</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 值为 a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">not_empty(None)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 不会报错(<span style="color: black;">倘若</span> return a.strip() 就会报错)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 在处理None的问题上相当于</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">def not_empty(a):</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">if a is None:</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">return None</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">else:</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">return a.strip()</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">细细品味and和or的差别,<span style="color: black;">她们</span><span style="color: black;">规律</span>类似,<span style="color: black;">然则</span>实现的功能是不<span style="color: black;">能够</span>相互替代的</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">or 是结果<span style="color: black;">倘若</span>不满意有个善后工作</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">and是要做一件事之前先检验一下,<span style="color: black;">不可</span>做就不让它做。</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://p3-sign.toutiaoimg.com/pgc-image/1525090658903fdc4d7b400~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1723903905&amp;x-signature=wJHlbvbvSoWdO6nUTKQVoS6HKAY%3D" style="width: 50%; margin-bottom: 20px;"></p>
      <h1 style="color: black; text-align: left; margin-bottom: 10px;">3.单行if-else</h1>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a = 1</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">b = 3 if a == 1 else 2</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">print(it is one if a == 1 else no)</p>
      <h1 style="color: black; text-align: left; margin-bottom: 10px;">4.迭代器传入函数中<span style="color: black;">不消</span>加括号</h1>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># <span style="color: black;">通常</span>是<span style="color: black;">这般</span></p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a = (i for i in range(10))</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">sum(a)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># <span style="color: black;">咱们</span><span style="color: black;">能够</span><span style="color: black;">这般</span></p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">sum((i for i in range(10)))</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 但<span style="color: black;">咱们</span>还<span style="color: black;">能够</span><span style="color: black;">这般</span></p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">sum(i for i in range(10))</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 类似的有</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">.join(str(i) for i in range(10))</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">python有趣的解包用法</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">python中的解包<span style="color: black;">能够</span><span style="color: black;">这般</span>理解:一个list是一个整体,想把list中<span style="color: black;">每一个</span>元素当成一个个个体剥离出来,这个过程<span style="color: black;">便是</span>解包,<span style="color: black;">咱们</span>来看下面这些例子。</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1.将list中<span style="color: black;">每一个</span>元素赋值给一个变量</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; name, age, date = </p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; name</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">Bob</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; age</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">20</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; date</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2018-1-1</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">2.可迭代对象都<span style="color: black;">能够</span><span style="color: black;">这般</span>做</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 列表</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = </p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = enumerate()</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">(0, a)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 元组</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = (a, b, c)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 字典</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = {a:1, b:2, c:3}</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = {a:1, b:2, c:3}.items()</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">(a, 1)</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 字符串</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = abc</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"># 生成器</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a,b,c = (x + 1 for x in range(3))</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; a</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">1</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">倘若</span>可迭代对象<span style="color: black;">包括</span>的元素和前面待赋值变量数量不一致,则会报错。<span style="color: black;">然则</span><span style="color: black;">能够</span><span style="color: black;">经过</span>*来<span style="color: black;">暗示</span>多个元素</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><img src="https://p3-sign.toutiaoimg.com/pgc-image/152509076252414d5a82c2e~noop.image?_iz=58558&amp;from=article.pc_detail&amp;lk3s=953192f4&amp;x-expires=1723903905&amp;x-signature=Thip1dO6WJ6JzmdXg9o9pSYMWjw%3D" style="width: 50%; margin-bottom: 20px;"></p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">3.星号的<span style="color: black;">运用</span></p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><span style="color: black;">例如</span><span style="color: black;">咱们</span>要计算平均分,去除最高分和最低分,除了用切片,还<span style="color: black;">能够</span>用解包的方式<span style="color: black;">得到</span>中间的数值</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; first, *new, last = </p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">&gt;&gt;&gt; new</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"></p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;">用*来<span style="color: black;">暗示</span>多个数值</p>
      <p style="font-size: 16px; color: black; line-height: 40px; text-align: left; margin-bottom: 15px;"><strong style="color: blue;">你用python做过什么有趣的事情?</strong></p>
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