{"id":180,"date":"2023-02-09T10:06:03","date_gmt":"2023-02-09T02:06:03","guid":{"rendered":"https:\/\/www.peijun.site\/?p=180"},"modified":"2024-01-10T10:48:22","modified_gmt":"2024-01-10T02:48:22","slug":"1-lambda%e8%a1%a8%e8%be%be%e5%bc%8f","status":"publish","type":"post","link":"http:\/\/www.peijun.site\/index.php\/2023\/02\/09\/1-lambda%e8%a1%a8%e8%be%be%e5%bc%8f\/","title":{"rendered":"1. lambda\u8868\u8fbe\u5f0f"},"content":{"rendered":"<pre class=\"EnlighterJSRAW\" data-enlighter-language=\"python\" data-enlighter-theme=\"enlighter\">'''\r\nlambda\u8868\u8fbe\u5f0f\u7ec3\u4e60\r\n'''\r\n\r\nimport random\r\n\r\n# test\r\n\r\nclass User:\r\n    def __init__(self, name = '', age = 0):\r\n        self.name = name\r\n        self.age = age\r\n    \r\n    def intro(self):\r\n        print(\"My name is {}, My age is {}\".format(self.name, self.age))\r\n\r\ndef randName(len: int = 5) -&gt; str:\r\n    \"\"\"\r\n    \u6839\u636e\u4f20\u5165\u7684\u6570\u5b57\u751f\u6210\u5bf9\u5e94\u957f\u5ea6\u7684\u968f\u673a\u5b57\u7b26\u4e32\r\n    \r\n    Parameters:\r\n    len - \u5f85\u751f\u6210\u7684\u5b57\u7b26\u4e32\u957f\u5ea6\r\n    \r\n    Returns:\r\n        \u5bf9\u5e94\u957f\u5ea6\u7684\u968f\u673a\u5b57\u7b26\u4e32\r\n    \r\n    Raises:\r\n        None\r\n    \"\"\"\r\n    str = 'abcdefghijklmnopqrstuvwxyz'\r\n    name = ''\r\n    for i in range(len):\r\n        idx = random.randint(0, 25)\r\n        s = str[idx]\r\n        if name == '':\r\n            s = s.upper()\r\n        name += s\r\n    return name\r\n\r\nuserlist = []\r\nfor i in range(1, 10):\r\n    userlist.append(User(randName(random.randint(5, 10)), random.randint(15, 60)))\r\n\r\n'''\r\nfilter(function, iterable)\r\n\u5bf9\u53ef\u8fed\u4ee3\u5bf9\u8c61\u8fdb\u884c\u8fc7\u6ee4\uff0c\u53c2\u6570function\u662f\u4e00\u4e2a\u51fd\u6570\uff0c\u53c2\u6570iterable\u662f\u53ef\u8fed\u4ee3\u5bf9\u8c61\u3002\r\nfilter()\u51fd\u6570\u8c03\u7528\u65f6iterable\u4f1a\u904d\u5386\uff0c\u5b83\u7684\u5143\u7d20\u88ab\u9010\u4e00\u4f20\u5165funciton\u51fd\u6570\uff0cfunction\u51fd\u6570\u8fd4\u56de\u5e03\u5c14\u503c\u3002\r\n\u5728funciton\u51fd\u6570\u4e2d\u7f16\u5199\u8fc7\u6ee4\u6761\u4ef6\uff0c\u5982\u679c\u4e3atrue\u5219\u4fdd\u7559\uff0c\u4e3afalse\u5219\u88ab\u8fc7\u6ee4\u6389\r\n'''\r\ncuser = filter(lambda u: u.name.startswith('C'), userlist)\r\nprint(\"filter:\")\r\nfor u in cuser:\r\n    u.intro()\r\n\r\n\r\n'''\r\nmap(function, iterable)\r\n\u5bf9\u53ef\u8fed\u4ee3\u5bf9\u8c61\u7684\u5143\u7d20\u8fdb\u884c\u53d8\u6362\uff0c\u53c2\u6570\u4f7f\u7528\u540c\u4e0a\r\n'''\r\nprint(\"map:\")\r\n# map(lambda u: u.name.lower(), userlist)\r\n# for u in userlist:\r\n#     u.intro()\r\n\r\nusers = ['jack', 'Tom', 'Tony', 'Alice']\r\nusers_map = map(lambda u: u.lower(), users)  \r\nprint(list(users_map))\r\n\r\nusers_map = map(lambda u: u.lower(), filter(lambda u: u.startswith('T'), users))\r\nprint(list(users_map))\r\n\r\n\r\n\"\"\"\r\nreduce\u7684\u4f5c\u7528\u662f\u5148\u628a\u5217\u8868\u4e2d\u7684\u524d\u4fe9\u4e2a\u5143\u7d20\u53d6\u51fa\u8ba1\u7b97\u51fa\u4e00\u4e2a\u503c\u7136\u540e\u4e34\u65f6\u4fdd\u5b58\u7740,\r\n\u63a5\u4e0b\u6765\u7528\u8fd9\u4e2a\u4e34\u65f6\u4fdd\u5b58\u7684\u503c\u548c\u5217\u8868\u4e2d\u7b2c\u4e09\u4e2a\u5143\u7d20\u8fdb\u884c\u8ba1\u7b97,\u6c42\u51fa\u4e00\u4e2a\u65b0\u7684\u503c\u5c06\u6700\u5f00\u59cb\r\n\u4e34\u65f6\u4fdd\u5b58\u7684\u503c\u8986\u76d6\u6389,\u7136\u540e\u5728\u7528\u8fd9\u4e2a\u65b0\u7684\u4e34\u65f6\u503c\u548c\u5217\u8868\u4e2d\u7b2c\u56db\u4e2a\u5143\u7d20\u8ba1\u7b97.\u4f9d\u6b21\u7c7b\u63a8\r\n\"\"\"\r\nfrom functools import reduce\r\n\r\nna = [1, 2, 3, 4, 5, 6, 7, 8, 9]\r\nprint(\"reduce:\")\r\nprint(reduce(lambda x, y: x * 10 + y, na))\r\n\r\n\r\n\r\n\r\n<\/pre>\n<p>&nbsp;<\/p>\n","protected":false},"excerpt":{"rendered":"<p>Python lambda\u7ec3\u4e60<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[5],"tags":[],"_links":{"self":[{"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/posts\/180"}],"collection":[{"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/comments?post=180"}],"version-history":[{"count":5,"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/posts\/180\/revisions"}],"predecessor-version":[{"id":186,"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/posts\/180\/revisions\/186"}],"wp:attachment":[{"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/media?parent=180"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/categories?post=180"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/www.peijun.site\/index.php\/wp-json\/wp\/v2\/tags?post=180"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}