{"id":203,"date":"2023-02-22T22:20:42","date_gmt":"2023-02-22T14:20:42","guid":{"rendered":"https:\/\/www.appblog.cn\/?p=203"},"modified":"2023-04-30T15:29:20","modified_gmt":"2023-04-30T07:29:20","slug":"python-list","status":"publish","type":"post","link":"https:\/\/www.appblog.cn\/index.php\/2023\/02\/22\/python-list\/","title":{"rendered":"Python\u5217\u8868"},"content":{"rendered":"

\u5217\u8868<\/h2>\n

\u4e00\u4e2a\u6570\u7ec4\u4e2d\u53ef\u4ee5\u6709\u5b57\u7b26\u4e32\uff0c\u4e5f\u53ef\u4ee5\u6709\u6570\u5b57<\/h3>\n

<\/p>\n

>>> spam = [['cat','bat'],[10,20,30]]\n>>> spam[1]\n[10, 20, 30]\n>>> spam[0]\n['cat', 'bat']\n>>> spam[0][0]\n'cat'\n>>> spam[1][0]\n10\n>>> spam[0][0][0]\n'c'\n>>> spam[-1]\n[10, 20, 30]<\/code><\/pre>\n
\u5229\u7528\u5207\u7247\u83b7\u53d6\u5b50\u5217\u8868<\/h3>\n
>>> spam\n['a', 'b', 'c', 'd']\n>>> spam[1:3]\n['b', 'c']\n>>> spam[1:-1]\n['b', 'c']\n>>> <\/code><\/pre>\n
\u5217\u8868\u51fd\u6570<\/h2>\n
len<\/h3>\n
>>> len(spam)\n4<\/code><\/pre>\n
\u64cd\u4f5c\u7b26 \u2018*\u2019,\u2019+\u2019\u8fd0\u7b97<\/h3>\n
>>> ['a','c','d']+[1,2,3,4]\n['a', 'c', 'd', 1, 2, 3, 4]\n>>> (['a','c','d']+[1,2,3,4])*3\n['a', 'c', 'd', 1, 2, 3, 4, 'a', 'c', 'd', 1, 2, 3, 4, 'a', 'c', 'd', 1, 2, 3, 4]<\/code><\/pre>\n
del\u4ece\u5217\u8868\u4e2d\u5220\u9664<\/h3>\n
>>> spam\n['a', 'b', 'c', 'd']\n>>> del spam[1]\n>>> spam\n['a', 'c', 'd']<\/code><\/pre>\n
for\u5faa\u73af\u548c\u5217\u8868<\/h3>\n
>>> for i in [1,2,3]:\n    print(spam[i])<\/code><\/pre>\n
in \u548c not in \u64cd\u4f5c<\/h3>\n
>>> spam = ['a', 'b', 'c', 'd']\n>>> spam\n['a', 'b', 'c', 'd']\n>>> a = 'a'\n>>> a in spam\nTrue\n>>> temp = 'f'\n>>> temp not in spam\nTrue<\/code><\/pre>\n
\u591a\u91cd\u8d4b\u503c\u6280\u5de7<\/h2>\n
>>> spam = ['a', 'b', 'c', 'd']\n>>> a,b,c,d = spam\n>>> a\n'a'\n>>> spam[2:4] = ['1', '2']\n>>> spam\n['a', 'b', '1', '2']<\/code><\/pre>\n
\u65b9\u6cd5<\/h2>\n
index()\u65b9\u6cd5\u5728\u5217\u8868\u4e2d\u67e5\u627e\u503c<\/h3>\n
>>> spam = ['a','b','c']\n>>> spam\n['a', 'b', 'c']\n>>> spam.index('a')\n0<\/code><\/pre>\n
append()\u548cinsert()\u7684\u4f7f\u7528<\/h3>\n
>>> spam\n['a', 'b', 'c']\n>>> spam.append(a)\n>>> spam\n['a', 'b', 'c', 'a']  #\u5728\u5217\u8868\u6700\u540e\u6dfb\u52a0\u9879\u76ee\n>>> spam.insert(1, 'temp')\n>>> spam\n['a', 'temp', 'b', 'c', 'a']  #\u5728\u6307\u5b9a\u4f4d\u7f6e\u6dfb\u52a0\u5236\u5b9a\u9879<\/code><\/pre>\n
remove()\u65b9\u6cd5\u4ece\u5217\u8868\u4e2d\u5220\u9664\u503c<\/h3>\n
>>> spam\n['a', 'temp', 'b', 'c', 'a']\n>>> spam.remove('temp')\n>>> spam\n['a', 'b', 'c', 'a']\n>>> spam.remove('g')\nTraceback (most recent call last):\n  File "<pyshell#86>", line 1, in <module>\n    spam.remove('g')\nValueError: list.remove(x): x not in list<\/code><\/pre>\n
sort()\u5c06\u5217\u8868\u4e2d\u7684\u503c\u7684\u6392\u5e8f<\/h3>\n
\u9ed8\u8ba4\u6309\u7167ASCII\u6392\u5e8f<\/p>\n
>>> s = ['c', 'b', 'a', 1, 5, 3, 3.1]\n>>> s.sort()\n>>> s\n[1, 3, 3.1, 5, 'a', 'b', 'c']<\/code><\/pre>\n
\u9006\u5411\u6392\u5e8f<\/h3>\n
>>> s = [1, 4, 3.14, 3, 5]\n>>> s.sort(reverse=True)\n>>> s\n[5, 4, 3.14, 3, 1]<\/code><\/pre>\n
\u6309\u7167\u5b57\u5178\u6392\u5e8f<\/h3>\n
\u6ce8\uff1akey = str.lower \u662f\u628a\u6240\u6709\u5143\u7d20\u5f53\u4f5c\u5c0f\u5199\u00b7<\/p>\n
>>> spam = ['a','Z','z','A']\n>>> spam.sort(key=str.lower)\n>>> spam\n['a', 'A', 'Z', 'z']<\/code><\/pre>\n
\u5143\u7ec4\u6570\u636e\u7c7b\u578b<\/h2>\n
\u5143\u7ec4\u7684\u5185\u5bb9\u662f\u4e0d\u53ef\u6539\u53d8\u7684\uff0c\u5176\u6b21Python\u5bf9\u5143\u7ec4\u8fdb\u884c\u4e86\u4f18\u5316\uff0c\u4f7f\u7528\u901f\u5ea6\u66f4\u5feb<\/p>\n
>>> sp = ('hello',99,3.14)\n>>> type(sp)\n<type 'tuple'>\n>>> type(('hello',))\n<class 'tuple'>\n>>> type(('hello'))\n<class 'str'>\n>>> sp[1]\n99\n>>> sp[1] = 88\nTraceback (most recent call last):\n  File "<stdin>", line 1, in <module>\nTypeError: 'tuple' object does not support item assignment<\/code><\/pre>\n
\u4f7f\u7528list()\u548ctuple()\u51fd\u6570\u6765\u8f6c\u6362\u7c7b\u578b<\/h2>\n
>>> list(('who','are','you'))\n['who', 'are', 'you']\n>>> list(('hello'))\n['h', 'e', 'l', 'l', 'o']\n>>> tuple(['hello','word'])\n('hello', 'word')\n>>> tuple(['hello'])\n('hello',)<\/code><\/pre>\n
\u5f15\u7528<\/h2>\n
\u5728\u8d4b\u503c\u65f6\u5e76\u672a\u590d\u5236\uff0c\u800c\u662f\u6307\u5411\u540c\u4e00\u4e2a\u5217\u8868<\/p>\n
>>> spam\n[1, 5, 4, 2, 'hello', 'Z', 'z']\n>>> chees = spam\n>>> chees[2] = 'world'\n>>> spam\n[1, 5, 'world', 2, 'hello', 'Z', 'z']\n>>> chees\n[1, 5, 'world', 2, 'hello', 'Z', 'z']<\/code><\/pre>\n
\u4f20\u9012\u5e94\u7528\uff08\u7c7b\u4f3c\u4e8e\u5f15\u7528\u8c03\u7528\uff09<\/h2>\n
def eggs(temp):\n    temp.append('hello')\nspam = [1,2,3]\neggs(spam)\nprint(spam)\n#[1, 2, 3, 'hello']<\/code><\/pre>\n
copy()\u51fd\u6570\u548cdeepcopy()\u51fd\u6570<\/h2>\n
copy.copy() \u53ef\u4ee5\u7528\u6765\u590d\u5236\u5217\u8868\u548c\u5b57\u5178\u8fd9\u6837\u7684\u53ef\u53d8\u503c\uff0c\u800c\u4e0d\u53ea\u662f\u590d\u5236\u5f15\u7528<\/p>\n
>>> import copy\n>>> spam = [1,2,3]\n>>> spam\n[1, 2, 3]\n>>> temp = copy.copy(spam)\n>>> temp\n[1, 2, 3]\n>>> spam.append('hello')\n>>> spam\n[1, 2, 3, 'hello']\n>>> temp\n[1, 2, 3]\n>>> temp.append('OK')\n>>> spam,temp\n([1, 2, 3, 'hello'], [1, 2, 3, 'OK'])<\/code><\/pre>\n
\u5982\u679c\u8bf4\u5217\u8868\u4e2d\u5305\u542b\u4e86\u5217\u8868\uff0c\u5219\u5e94\u5f53\u4f7f\u7528copy.deepcopt()<\/p>\n
>>> spam\n[[1, 2, 3, 'OK'], 1, 2]\n>>> temp = copy.deepcopy(spam)\n>>> temp\n[[1, 2, 3, 'OK'], 1, 2]<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
\u5217\u8868 \u4e00\u4e2a\u6570\u7ec4\u4e2d\u53ef\u4ee5\u6709\u5b57\u7b26\u4e32\uff0c\u4e5f\u53ef\u4ee5\u6709\u6570\u5b57 >>> spam = [['cat&#039 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[79],"tags":[],"class_list":["post-203","post","type-post","status-publish","format-standard","hentry","category-python"],"_links":{"self":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/203","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/comments?post=203"}],"version-history":[{"count":0,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/posts\/203\/revisions"}],"wp:attachment":[{"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/media?parent=203"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/categories?post=203"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/www.appblog.cn\/index.php\/wp-json\/wp\/v2\/tags?post=203"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}