{"id":824,"date":"2022-10-10T09:42:51","date_gmt":"2022-10-10T01:42:51","guid":{"rendered":"https:\/\/qaqaq.top\/?p=824"},"modified":"2022-11-27T12:43:00","modified_gmt":"2022-11-27T04:43:00","slug":"python-%e5%ae%9e%e7%8e%b0%e5%ad%97%e7%ac%a6%e4%b8%b2%e5%8f%8d%e8%bd%ac%e7%9a%849%e7%a7%8d%e6%96%b9%e6%b3%95","status":"publish","type":"post","link":"https:\/\/qaqaq.top\/?p=824","title":{"rendered":"Python \u5b9e\u73b0\u5b57\u7b26\u4e32\u53cd\u8f6c\u76849\u79cd\u65b9\u6cd5"},"content":{"rendered":"\n<p>\u6837\u4f8b\uff1a\u5982 a=&#8217;123456789&#8242;&nbsp;\u53cd\u8f6c\u6210 a=&#8217;987654321&#8242;<\/p>\n\n\n\n<p>\u7b2c\u4e00\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528\u5b57\u7b26\u4e32\u5207\u7247<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>>>> a='123456789'\r\n>>> a = a&#91;::-1]\r\n\r\n'987654321'<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e8c\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528reversed() \u53ef\u8bfb\u884c\u597d\uff0c\u4f46\u901f\u5ea6\u8f83\u6162<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>>>> ''.join(reversed('123456789'))\r\n'987654321'<\/code><\/pre>\n\n\n\n<p>\u5c01\u88c5\u4f7f\u7528<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def reversed_string(a_string):\r\n    return a_string&#91;::-1]\r\n \r\n>>> reversed_string('123456789')\r\n'123456789'<\/code><\/pre>\n\n\n\n<p>\u6ce8\u610f\uff1a<\/p>\n\n\n\n<blockquote class=\"wp-block-quote is-layout-flow wp-block-quote-is-layout-flow\"><p>python\u7684str\u5bf9\u8c61\u4e2d\u6ca1\u6709\u5185\u7f6e\u7684\u53cd\u8f6c\u51fd\u6570<\/p><\/blockquote>\n\n\n\n<p>python\u5b57\u7b26\u4e32\u76f8\u5173\u57fa\u7840\u77e5\u8bc6\uff1a<\/p>\n\n\n\n<ol class=\"wp-block-list\"><li>python\u4e2d\uff0c\u5b57\u7b26\u6362\u662f\u4e0d\u53ef\u53d8\uff0c\u66f4\u6539\u5b57\u7b26\u4e32\u4e0d\u4f1a\u4fee\u6539\u5b57\u7b26\u4e32\uff0c\u800c\u662f\u521b\u5efa\u4e00\u4e2a\u65b0\u7684\u5b57\u7b26\u4e32\u3002<\/li><li>\u5b57\u7b26\u4e32\u662f\u53ef\u5207\u7247\uff0c\u5207\u7247\u5b57\u7b26\u4e32\u4f1a\u4ee5\u7ed9\u5b9a\u7684\u589e\u91cf\u4ece\u5b57\u7b26\u4e32\u4e2d\u7684\u4e00\u4e2a\u70b9\uff08\u5411\u540e\u6216\u5411\u524d\uff09\u5411\u53e6\u4e00\u4e2a\u70b9\u63d0\u4f9b\u4e00\u4e2a\u65b0\u5b57\u7b26\u4e32\u3002\u5b83\u4eec\u5728\u4e0b\u6807\u4e2d\u91c7\u7528\u5207\u7247\u8868\u793a\u6cd5\u6216\u5207\u7247\u5bf9\u8c61\uff1a<\/li><\/ol>\n\n\n\n<pre class=\"wp-block-code\"><code># \u4e0b\u6807\u901a\u8fc7\u5728\u5927\u62ec\u53f7\u4e2d\u5305\u542b\u5192\u53f7\u6765\u521b\u5efa\u5207\u7247\uff1a\r\nstring&#91;start:stop:step]\r\n \r\n# \u8981\u5728\u5927\u62ec\u53f7\u5916\u521b\u5efa\u5207\u7247\uff0c\u60a8\u9700\u8981\u521b\u5efa\u5207\u7247\u5bf9\r\nslice_obj = slice(start, stop, step)\r\nstring&#91;slice_obj]<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e09\u79cd\u65b9\u6cd5\uff1a\u5faa\u73af\u4ece\u5b57\u7b26\u4e32\u63d0\u53d6\u6570\u636e\uff0c\u7136\u540e\u8fdb\u884c\u5b57\u7b26\u4e32\u62fc\u63a5\uff08\u6162\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def reverse_a_string_slowly(a_string):\r\n    new_string = ''\r\n    index = len(a_string)\r\n    while index:\r\n        index -= 1                    # index = index - 1\r\n        new_string += a_string&#91;index] # new_string = new_string + character\r\n    return new_string<\/code><\/pre>\n\n\n\n<p>\u7b2c\u56db\u79cd\u65b9\u6cd5\uff1a\u5faa\u73af\u4ece\u5b57\u7b26\u4e32\u63d0\u53d6\u6570\u636e\uff0c\u5199\u5165\u5230\u4e00\u4e2a\u7a7a\u5217\u8868\u4e2d\uff0c\u7136\u540e\u4f7f\u7528join\u8fdb\u884c\u5b57\u7b26\u4e32\u62fc\u63a5\uff08\u6162\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def reverse_a_string_more_slowly(a_string):\r\n    new_strings = &#91;]\r\n    index = len(a_string)\r\n    while index:\r\n        index -= 1                       \r\n        new_strings.append(a_string&#91;index])\r\n    return ''.join(new_strings)<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e94\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528\u5b57\u7b26\u4e32\u62fc\u63a5\uff08\u6162\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def string_reverse(a_string):\r\n    n = len(a_string)\r\n    x=\"\"\r\n    for i in range(n-1,-1,-1):\r\n        x += test&#91;i]\r\n    return x<\/code><\/pre>\n\n\n\n<p>\u7b2c\u516d\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528reduce<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>reduce(lambda x,y : y+x, a_string)<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e03\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528\u9012\u5f52\uff08\u6162\uff09<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def rev_string(s): \r\n    if len(s) == 1:\r\n        return s\r\n \r\n    return s&#91;-1] + rev_string(s&#91;:-1])<\/code><\/pre>\n\n\n\n<p>\u7b2c\u516b\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528list()\u00a0\u548creverser()\u914d\u5408<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>a_string='123456789'\r\n \r\ndef rev_string(a_string):\r\n    l=list(a)\r\n    l.reverse()\r\n    return ''.join(l)<\/code><\/pre>\n\n\n\n<p>\u7b2c\u4e5d\u79cd\u65b9\u6cd5\uff1a\u4f7f\u7528\u6808<\/p>\n\n\n\n<pre class=\"wp-block-code\"><code>def rev_string(a_string):\r\n    l = list(a_string) #\u6a21\u62df\u5168\u90e8\u5165\u6808\r\n    new_string = \"\"\r\n    while len(l)>0:\r\n        new_string += l.pop() #\u6a21\u62df\u51fa\u6808\r\n    return new_string<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"<p>\u6837\u4f8b\uff1a\u5982 a=&#8217;123456789&#8242;&nbsp;\u53cd\u8f6c\u6210 a=&#8217;987654 [&hellip;]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[45],"tags":[50],"class_list":["post-824","post","type-post","status-publish","format-standard","hentry","category-python-","tag-python"],"_links":{"self":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/824"}],"collection":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=824"}],"version-history":[{"count":1,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/824\/revisions"}],"predecessor-version":[{"id":825,"href":"https:\/\/qaqaq.top\/index.php?rest_route=\/wp\/v2\/posts\/824\/revisions\/825"}],"wp:attachment":[{"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=824"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=824"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/qaqaq.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=824"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}