{"id":49,"date":"2019-11-15T11:20:16","date_gmt":"2019-11-15T03:20:16","guid":{"rendered":"http:\/\/149.129.52.76\/?p=49"},"modified":"2021-01-14T10:56:18","modified_gmt":"2021-01-14T02:56:18","slug":"python%e7%ac%94%e8%ae%b0%e4%ba%8c","status":"publish","type":"post","link":"https:\/\/blog.kishere.cn\/?p=49","title":{"rendered":"Python\u7b14\u8bb0\u4e8c"},"content":{"rendered":"

lambda\u8868\u8fbe\u5f0f :<\/p>\n

g = lambda x , y : x + y\n# \u901a\u8fc7lambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u6784\u5efa\u533f\u540d\u51fd\u6570\u7701\u53bb\u5b9a\u4e49\u548c\u547d\u540d\u7684\u8fc7\u7a0b, \u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61 \n<\/code><\/pre>\n
filter\u8fc7\u6ee4\u5668:<\/p>\n
filter(function or None, itrtable)\nfilter(None, [1, 0, false, true])#\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61\nlist(filter(None, [1, 0, false, true))#\u8fd4\u56de1, true\n#filter\u9002\u5408\u4e0elambda\u8868\u8fbe\u5f0f\u4e00\u8d77\u4f7f\u7528\nlist(filter(lambda x : x % 2, range(10))\n#\u8f93\u51fa1~10 \u4e2d\u7684\u5947\u6570, \u5076\u6570\u90fd\u53d8\u6210\u4e86false(0)\nmap\u6620\u5c04:\nlist(map(lambda x : x * 2, range(10)))\n#\u8f93\u51fa1~10\u4e2d\u6bcf\u4e2a\u5143\u7d20\u4e58\u4e8c\u7684\u7ed3\u679c\n<\/code><\/pre>\n
\u9012\u5f52:<\/p>\n
#\u8bbe\u7f6e\u9012\u5f52\u6df1\u5ea6: \nimport sys \nsys.setrecursionlimit(x)#x\u4e3a\u4f60\u60f3\u8981\u5b9a\u4e49\u7684\u9012\u5f52\u6df1\u5ea6\n<\/code><\/pre>\n
\u5b57\u5178 :<\/p>\n
dict1 = {'kishere' : '\u70b8\u9e21', '\u9655\u897f\u79d1\u6280\u5927\u5b66' : '\u50bb\u79d1\u5927'}\n#\u5b57\u5178\u662fpython\u4e2d\u552f\u4e00\u7684\u952e\u503c\u5bf9\u5e94\u7ed3\u6784\nprint(dict1(kishere))#\u6253\u5370\u51fa\u70b8\u9e21\ndict2 = dict((('a' , 97), ('b', 98), ('c', 99)))#dict()\u5de5\u5382\u51fd\u6570\u521b\u5efa\u5b57\u5178\ndict3 = dict(kishere = '\u70b8\u9e21', \u9655\u897f\u79d1\u6280\u5927\u5b66 = '\u50bb\u79d1\u5927')#\u6ce8\u610f\u8fd9\u91cc\u4e0d\u80fd\u5728\u952e\u91cc\u52a0\u5f15\u53f7\ndict3['kishere'] = 'god'#\u4fee\u6539\u952e'kishere'\u5bf9\u5e94\u7684\u503c\ndict3['PHP'] = '\u4e16\u754c\u4e0a\u6700\u597d\u7684\u7f16\u7a0b\u8bed\u8a00'#\u5411dict3\u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9\ndict1 = {} \ndict1.fromkeys((1, 2, 3))#\u8f93\u51fa{1:None, 2:None, 3:None}\ndict1.fromkeys((1, 2, 3), 'number')#\u8f93\u51fa{1:number, 2:number, 3:number} \u6ce8\u610f\u53ea\u80fd\u7ed9\u6240\u6709\u952e\u8d4b\u4e00\u6837\u7684\u503c, \u60f3\u8981\u7ed9\u591a\u4e2a\u952e\u8d4b\u4e0d\u4e00\u6837\u7684\u503c\u7528\u5143\u7ec4\u4e5f\u4e0d\u884c.\ndict1. fromkeys(range(32),'\u8d5e')\nfor eachkey in dict1.keys():\n    print(eachkey)\n#\u904d\u5386\u6253\u5370\u6bcf\u4e00\u4e2a\u952e\nfor eachvalue in dict1.values():\n    print(eachvalue)\n#\u904d\u5386\u6253\u5370\u6bcf\u4e00\u4e2a\u503c\nfor eachvitem in dict1.items():\n    print(eachitem)\n#\u904d\u5386\u7b54\u5e94\u6bcf\u4e00\u4e2a\u76f8\ndict1.get(32, 'notfind')#\u8fd4\u56de\u7b2c32\u4e2a\u503c, \u5982\u679c\u6ca1\u6709\u8fd4\u56de'notfind', \u7b2c\u4e8c\u4e2a\u53c2\u6570\u5982\u679c\u4e0d\u5199, \u5219\u9ed8\u8ba4\u8fd4\u56deNone\ndict1.clear()#\u6e05\u7a7a\u5b57\u5178\ndict2 = dict1.copy()#\u5b57\u5178\u6d45\u62f7\u8d1d\ndict1.pop(2)#\u5220\u9664\u952e\u4e3a2\u7684\u952e\u503c\u5bf9\ndict1.setdefault('pp', 'ap')#\u8fd9\u4e2a\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u67e5\u8be2, \u5982\u679c\u6ca1\u6709\u67e5\u8be2\u5230\u5c31\u81ea\u52a8\u6dfb\u52a0, \u5982\u679c\u4e0d\u8bbe\u7f6e\u6dfb\u52a0\u7684\u76f8\u7684\u503c, \u5c31\u9ed8\u8ba4\u8bbe\u7f6e\u4e3aNone\n<\/code><\/pre>\n
\u96c6\u5408:<\/p>\n
set1 = {1, 2, 3, 4}#\u5982\u679c\u6570\u636e\u6ca1\u6709\u4f53\u73b0\u6620\u5c04\u5173\u7cfb, \u5c31\u4f1a\u53d8\u6210\u96c6\u5408\nset2 = {1, 2, 3, 4, 5, 5, 2}#\u96c6\u5408\u4e2d\u7684\u6570\u636e\u4e0d\u80fd\u91cd\u590d, \u5426\u5219\u91cd\u590d\u7684\u6570\u636e\u4f1a\u88ab\u5254\u9664\nset3 = set(x)#set()\u662f\u5de5\u5382\u51fd\u6570, x\u53ef\u4ee5\u662f\u5217\u8868, \u5143\u7ec4, \u5b57\u7b26\u4e32\nset1.add(6)#\u5411\u96c6\u5408\u4e2d\u589e\u52a06\nset1.remove(6)#\u5411\u96c6\u5408\u4e2d\u5220\u96646\nnum1 = frozenset([1, 2, 3])\nnum1.add(4)#\u8fd9\u6837\u662f\u4e0d\u884c\u7684, \u4f7f\u7528\u4e86frozenset\u7684\u96c6\u5408\u4e0d\u80fd\u589e\u52a0\u5220\u9664\n<\/code><\/pre>\n","protected":false},"excerpt":{"rendered":"
lambda\u8868\u8fbe\u5f0f : g = lambda x , y : x + y # \u901a\u8fc7lambda\u8868\u8fbe\u5f0f\u53ef\u4ee5\u6784\u5efa\u533f\u540d\u51fd\u6570\u7701\u53bb\u5b9a\u4e49\u548c\u547d\u540d\u7684\u8fc7\u7a0b, \u8fd4\u56de\u503c\u662f\u4e00\u4e2a\u51fd\u6570\u5bf9\u8c61 filter\u8fc7\u6ee4\u5668: filter(function or None, itrtable) filter(None, [1, 0, false, true])#\u8fd4\u56de\u4e00\u4e2a\u5bf9\u8c61 list(filter(None, [1, 0, false, true))#\u8fd4\u56de1, true #filter\u9002\u5408\u4e0elambda\u8868\u8fbe\u5f0f\u4e00\u8d77\u4f7f\u7528 list(filter(lambda x : x % 2, range(10)) #\u8f93\u51fa1~10 \u4e2d\u7684\u5947\u6570, \u5076\u6570\u90fd\u53d8\u6210\u4e86false(0) map\u6620\u5c04: list(map(lambda x : x * 2, range(10))) #\u8f93\u51fa1~10\u4e2d\u6bcf\u4e2a\u5143\u7d20\u4e58\u4e8c\u7684\u7ed3\u679c \u9012\u5f52: #\u8bbe\u7f6e\u9012\u5f52\u6df1\u5ea6: import sys sys.setrecursionlimit(x)#x\u4e3a\u4f60\u60f3\u8981\u5b9a\u4e49\u7684\u9012\u5f52\u6df1\u5ea6 \u5b57\u5178 : dict1 = {‘kishere’ : ‘\u70b8\u9e21’, ‘\u9655\u897f\u79d1\u6280\u5927\u5b66’ : ‘\u50bb\u79d1\u5927’} #\u5b57\u5178\u662fpython\u4e2d\u552f\u4e00\u7684\u952e\u503c\u5bf9\u5e94\u7ed3\u6784 print(dict1(kishere))#\u6253\u5370\u51fa\u70b8\u9e21 dict2 = dict(((‘a’ , 97), (‘b’, 98), (‘c’, 99)))#dict()\u5de5\u5382\u51fd\u6570\u521b\u5efa\u5b57\u5178 dict3 = dict(kishere = ‘\u70b8\u9e21’, \u9655\u897f\u79d1\u6280\u5927\u5b66 = ‘\u50bb\u79d1\u5927’)#\u6ce8\u610f\u8fd9\u91cc\u4e0d\u80fd\u5728\u952e\u91cc\u52a0\u5f15\u53f7 dict3[‘kishere’] = ‘god’#\u4fee\u6539\u952e’kishere’\u5bf9\u5e94\u7684\u503c dict3[‘PHP’] = ‘\u4e16\u754c\u4e0a\u6700\u597d\u7684\u7f16\u7a0b\u8bed\u8a00’#\u5411dict3\u4e2d\u6dfb\u52a0\u952e\u503c\u5bf9 dict1 = {} dict1.fromkeys((1, 2, 3))#\u8f93\u51fa{1:None, 2:None, 3:None} dict1.fromkeys((1, 2, 3), ‘number’)#\u8f93\u51fa{1:number, 2:number, 3:number} \u6ce8\u610f\u53ea\u80fd\u7ed9\u6240\u6709\u952e\u8d4b\u4e00\u6837\u7684\u503c, \u60f3\u8981\u7ed9\u591a\u4e2a\u952e\u8d4b\u4e0d\u4e00\u6837\u7684\u503c\u7528\u5143\u7ec4\u4e5f\u4e0d\u884c. dict1. fromkeys(range(32),’\u8d5e’) for eachkey in dict1.keys(): print(eachkey) #\u904d\u5386\u6253\u5370\u6bcf\u4e00\u4e2a\u952e for eachvalue in dict1.values(): print(eachvalue) #\u904d\u5386\u6253\u5370\u6bcf\u4e00\u4e2a\u503c for eachvitem in dict1.items(): print(eachitem) #\u904d\u5386\u7b54\u5e94\u6bcf\u4e00\u4e2a\u76f8 dict1.get(32, ‘notfind’)#\u8fd4\u56de\u7b2c32\u4e2a\u503c, \u5982\u679c\u6ca1\u6709\u8fd4\u56de’notfind’, \u7b2c\u4e8c\u4e2a\u53c2\u6570\u5982\u679c\u4e0d\u5199, \u5219\u9ed8\u8ba4\u8fd4\u56deNone dict1.clear()#\u6e05\u7a7a\u5b57\u5178 dict2 = dict1.copy()#\u5b57\u5178\u6d45\u62f7\u8d1d dict1.pop(2)#\u5220\u9664\u952e\u4e3a2\u7684\u952e\u503c\u5bf9 dict1.setdefault(‘pp’, ‘ap’)#\u8fd9\u4e2a\u65b9\u6cd5\u4e5f\u53ef\u4ee5\u67e5\u8be2, \u5982\u679c\u6ca1\u6709\u67e5\u8be2\u5230\u5c31\u81ea\u52a8\u6dfb\u52a0, \u5982\u679c\u4e0d\u8bbe\u7f6e\u6dfb\u52a0\u7684\u76f8\u7684\u503c, \u5c31\u9ed8\u8ba4\u8bbe\u7f6e\u4e3aNone \u96c6\u5408: set1 = {1, 2, 3, 4}#\u5982\u679c\u6570\u636e\u6ca1\u6709\u4f53\u73b0\u6620\u5c04\u5173\u7cfb, \u5c31\u4f1a\u53d8\u6210\u96c6\u5408 set2 = {1, 2, 3, 4, 5, 5, 2}#\u96c6\u5408\u4e2d\u7684\u6570\u636e\u4e0d\u80fd\u91cd\u590d, \u5426\u5219\u91cd\u590d\u7684\u6570\u636e\u4f1a\u88ab\u5254\u9664 set3 = set(x)#set()\u662f\u5de5\u5382\u51fd\u6570, x\u53ef\u4ee5\u662f\u5217\u8868, \u5143\u7ec4, \u5b57\u7b26\u4e32 set1.add(6)#\u5411\u96c6\u5408\u4e2d\u589e\u52a06 set1.remove(6)#\u5411\u96c6\u5408\u4e2d\u5220\u96646 num1 = frozenset([1, 2, 3]) num1.add(4)#\u8fd9\u6837\u662f\u4e0d\u884c\u7684, \u4f7f\u7528\u4e86frozenset\u7684\u96c6\u5408\u4e0d\u80fd\u589e\u52a0\u5220\u9664<\/p>\n","protected":false},"author":1,"featured_media":66,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"inline_featured_image":false,"footnotes":""},"categories":[12,5],"tags":[],"_links":{"self":[{"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/posts\/49"}],"collection":[{"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=49"}],"version-history":[{"count":5,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/posts\/49\/revisions"}],"predecessor-version":[{"id":112,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/posts\/49\/revisions\/112"}],"wp:featuredmedia":[{"embeddable":true,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=\/wp\/v2\/media\/66"}],"wp:attachment":[{"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=49"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=49"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/blog.kishere.cn\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=49"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}