{"id":596,"date":"2017-03-04T15:37:27","date_gmt":"2017-03-04T07:37:27","guid":{"rendered":"http:\/\/192.168.1.20\/?p=596"},"modified":"2017-10-23T11:57:20","modified_gmt":"2017-10-23T03:57:20","slug":"201734-python{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}e5{d4daabd1ba368d9860c36387ddb72bbda14f8f9559d69d60a952800885260c03}ad{47dd41ec6bdcbd9a214c783a3735392b82ea6d1d918378c5a5","status":"publish","type":"post","link":"http:\/\/alextop.top\/?p=596","title":{"rendered":"2017\/3\/4 python\u5b66\u4e60\u65e5\u8bb0"},"content":{"rendered":"

Dict\u904d\u5386=\u5206\u884c\u6253\u5370
\n<\/span><\/p>\n

d = dict(a=1, b=2, c=3)
\n<\/span><\/p>\n

for k, v in d.items():
\n<\/span><\/span><\/span><\/span><\/p>\n


\n\t\t\tprint k, v
\n<\/span><\/span><\/span><\/p>\n

# a 1
\n\t\t\t<\/span><\/span><\/p>\n

# c 3
\n\t\t\t<\/span><\/span><\/p>\n

# b 2
\n<\/span><\/p>\n

\u901a\u8fc7\u8fd9\u4e2a\u65b9\u6cd5\u5b9e\u73b0\u4e86<\/span>headers<\/span>\u7684\u591a\u884c\u6253\u5370<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

response = requests.get(url_ip)
print<\/strong>(‘<<<headers>>>’<\/strong>)
w = response.headers
for <\/strong>k,v in <\/strong>w.items():
x = ‘:’
\n\t\t\t\t\t\t\t\t\t\t\t\t\tprint <\/span><\/strong>k,x,v
\n<\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

key <\/span>\u4e0e<\/span>value<\/span>\u4e4b\u95f4\u52a0\u4e86\u5192\u53f7\u3002\u3002\u4f46\u662f\u6709\u7a7a\u683c\u4e0d\u8212\u670d<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

\n\u00a0<\/p>\n

dict.copy()<\/span>\u662f\u4e00\u4e2a\u6d45\u62f7\u8d1d\uff0c\u5f53\u9047\u5230\u5b57\u5178\u6216\u8005\u5217\u8868\u65f6\uff0c\u5c06\u4e0d\u80fd\u5b8c\u5168\u62f7\u8d1d\u3002\u4f7f\u7528<\/span>copy<\/span>\u6a21\u5757\u7684<\/span>deepcopy()<\/span>\u65b9\u6cd5\u3002<\/span>
\n\t\t\t<\/span><\/span><\/p>\n

import copy
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

dict1 = {‘a’: [1, 2], ‘b’: 3}
\n<\/span><\/p>\n

dict2 = dict1
\n<\/span><\/p>\n

dict3 = dict1.copy()
\n<\/span><\/p>\n

dict4 = copy.deepcopy(dict1)
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

dict1[‘b’] = ‘change’
\n<\/span><\/p>\n

dict1[‘a’].append(‘change’)
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

print dict1 # {‘a’: [1, 2, ‘change’], ‘b’: ‘change’}
\n<\/span><\/p>\n

print dict2 # {‘a’: [1, 2, ‘change’], ‘b’: ‘change’}
\n<\/span><\/p>\n

print dict3 # {‘a’: [1, 2, ‘change’], ‘b’: 3}
\n<\/span><\/p>\n

print dict4 # {‘a’: [1, 2], ‘b’: 3}
\n<\/span><\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\u4f7f\u7528get, pop\u6765\u83b7\u53d6\/\u5220\u9664key\n<\/p>\n

\n\u00a0<\/p>\n

\u9996\u5148\uff0cdict[key] \u4e0e delete dict[key]\u4e5f\u53ef\u4ee5\u83b7\u53d6\/\u5220\u9664key\u3002\u4f46\u662fkey\u4e0d\u5b58\u5728\u65f6\uff0c\u4f1a\u5f15\u53d1 KeyError \u5f02\u5e38\u3002\u4e3a\u4e86\u907f\u514d\u5f15\u53d1\u5f02\u5e38\u53ef\u4ee5\u4f7f\u7528get\u548c\u5e26defaut\u53c2\u6570\u7684pop\n<\/p>\n

\u2022get(key[, default])<\/span>\n\t<\/p>\n

\u5982\u679ckey\u5728\u5b57\u5178\u4e2d\uff0c\u8fd4\u56de\u5bf9\u5e94\u7684value, \u5426\u5219\u8fd4\u56dedefault\u3002\u6240\u4ee5\u4ece\u6765\u4e0d\u4f1a\u5f15\u53d1\u5f02\u5e38\u3002\n<\/p>\n

\u2022pop(key[, default])<\/span>\n\t<\/p>\n

\u5982\u679cdefault\u672a\u8bbe\u7f6e\uff0c\u5219\u5982\u679ckey\u4e0d\u5728\u5b57\u5178\u4e2d\uff0c\u5220\u9664key\u5c06\u5f15\u53d1\u5f02\u5e38\u3002\u4f7f\u7528\u65f6\u52a0\u4e0adefault\u3002\n<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\n\n\n<\/colgroup>\n\n\n
\n

import string
\n<\/span><\/p>\n

s = string.ascii_lowercase
\n<\/span><\/p>\n

e = enumerate(s)
\n<\/span><\/p>\n

print s
\n<\/span><\/p>\n

print list(e)<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u8f93\u51fa\u4e3a\uff1a\n<\/p>\n

?<\/a>\n\t<\/p>\n

\n\n\n\n<\/colgroup>\n\n\n
\n

1\n<\/p>\n

2<\/p>\n<\/td>\n

\n

abcdefghij
\n<\/span><\/p>\n

[(0, ‘a’), (1, ‘b’), (2, ‘c’), (3, ‘d’), (4, ‘e’), (5, ‘f’), (6, ‘g’), (7, ‘h’), (8, ‘i’), (9, ‘j’)]<\/span><\/p>\n<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

\u5728\u540c\u65f6\u9700\u8981index\u548cvalue\u503c\u7684\u65f6\u5019\u53ef\u4ee5\u4f7f\u7528 enumerate\u3002\n<\/p>\n

\n\u00a0<\/p>\n

\n\u00a0<\/p>\n

\u5728python\u4e2d\u53ef\u4ee5\u901a\u8fc7in\u548cnot in\u5173\u952e\u5b57\u6765\u5224\u8bfb\u4e00\u4e2alist\u4e2d\u662f\u5426\u5305\u542b\u4e00\u4e2a\u5143\u7d20\n<\/p>\n

theList = [‘a’,’b’,’c’]
\n<\/span><\/p>\n

if ‘a’ in theList:
\n<\/span><\/p>\n

print ‘a in the list’<\/span>\n\t<\/p>\n

\n\u00a0<\/p>\n

if ‘d’ not in theList:
\n<\/span><\/p>\n

print ‘d is not in the list’<\/span>\n\t<\/p>\n

\n\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"

Dict\u904d\u5386=\u5206\u884c\u6253\u5370 d =…<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[24,10],"tags":[],"class_list":["post-596","post","type-post","status-publish","format-standard","hentry","category-python","category-jishu"],"_links":{"self":[{"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts\/596"}],"collection":[{"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=596"}],"version-history":[{"count":1,"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts\/596\/revisions"}],"predecessor-version":[{"id":996,"href":"http:\/\/alextop.top\/index.php?rest_route=\/wp\/v2\/posts\/596\/revisions\/996"}],"wp:attachment":[{"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=596"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=596"},{"taxonomy":"post_tag","embeddable":true,"href":"http:\/\/alextop.top\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=596"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}