{"id":725,"date":"2019-05-01T17:51:42","date_gmt":"2019-05-01T09:51:42","guid":{"rendered":"http:\/\/www.eait.co\/?p=725"},"modified":"2019-05-01T18:00:16","modified_gmt":"2019-05-01T10:00:16","slug":"%e6%8e%a8%e5%af%bc%e8%a1%a8%e8%be%be%e5%bc%8f%e8%bf%ad%e4%bb%a3%e5%99%a8%e7%94%9f%e6%88%90%e5%99%a8%e6%a8%a1%e5%9d%97%e5%92%8c%e5%8c%85","status":"publish","type":"post","link":"https:\/\/notes.coremix.net\/?p=725","title":{"rendered":"\u63a8\u5bfc\u8868\u8fbe\u5f0f\u8fed\u4ee3\u5668\u751f\u6210\u5668\u6a21\u5757\u548c\u5305"},"content":{"rendered":"
\u9b54\u6cd5\u65b9\u6cd5\u9700\u8981\u7279\u5b9a\u7684\u6761\u4ef6\u53bb\u89e6\u53d1<\/div>\n
\u6709next\u662f\u8fed\u4ee3\u5668<\/div>\n
<\/div>\n
<\/div>\n
# li = []<\/div>\n
# for i in range(1,10):<\/div>\n
# li.append(i)<\/div>\n
# print(li)<\/div>\n
# ————————————–<\/div>\n
<\/div>\n
# li = [i for i in range(1,10)] #\u5fc5\u987b\u638c\u63e1<\/div>\n
# print(li)<\/div>\n
# —————————————–<\/div>\n
#\u5217\u8868\u63a8\u5bfc + \u6761\u4ef6\u5224\u65ad (\u5fc5\u987b\u638c\u63e1)<\/div>\n
# li2 = [i*10 for i in range(1,10) if i%2 ==0]<\/div>\n
# print(li2)<\/div>\n
# ——————————————–<\/div>\n
#\u5217\u8868\u63a8\u5bfc+\u4e09\u76ee\u8fd0\u7b97\u7b26 \uff08\u5fc5\u987b\u638c\u63e1\uff09<\/div>\n
# li3 = [i*100 if i%3 ==0 else i*10 for i in range(1,10) ]<\/div>\n
# print(li3)<\/div>\n
# ——————————————–<\/div>\n
#\u96c6\u5408\u63a8\u5bfc<\/div>\n
# se = {i for i in range(1,10)}<\/div>\n
# print(se)<\/div>\n
# —————————————<\/div>\n
#\u5b57\u5178\u63a8\u5bfc<\/div>\n
a = [1,2,3,4,5,6,7]<\/div>\n
# b = enumerate(a)#\u8fd9\u4e2a\u51fd\u6570\u662f\u4ec0\u4e48\u610f\u601d<\/div>\n
<\/div>\n
# di = {i:j for i,j in enumerate(a)}<\/div>\n
# print(di)<\/div>\n
<\/div>\n
\u8fed\u4ee3\uff1a<\/div>\n
\u6bcf\u4e00\u6b21\u5faa\u73af\u90fd\u4f1a\u81ea\u52a8\u8ba9\u201c\u8fed\u4ee3\u53d8\u91cf\u201d\u6307\u5411\u201c\u4e0b\u4e00\u4e2a\u5143\u7d20\u201d<\/div>\n
the_list = [5,4,3,2,1,]<\/div>\n
for index in the_list:<\/div>\n
\u00a0\u00a0 \u00a0print(index)<\/div>\n
<\/div>\n
var = None<\/div>\n
index = 0<\/div>\n
while index < len(the_list):<\/div>\n
\u00a0\u00a0 \u00a0var = the_list[index]<\/div>\n
\u00a0\u00a0 \u00a0print(var)<\/div>\n
\u00a0\u00a0 \u00a0index +=1<\/div>\n
<\/div>\n
\u8fed\u4ee3\u5668\uff1a<\/div>\n
\u751f\u6210\u8fed\u4ee3\u5668\u7684\u65b9\u6cd5\uff1a<\/div>\n
1\uff0c iterator = iter(li)<\/div>\n
2, iterator = li.__iter__()<\/div>\n
02,\u00a0\u8fed\u4ee3\u5668\u5bf9\u8c61\u672c\u8eab\u9700\u8981\u652f\u6301\u4ee5\u4e0b\u4e24\u79cd\u65b9\u6cd5\uff0c\u4ed6\u4eec\u4e00\u8d77\u6784\u6210\u8fed\u4ee3\u5668\u534f\u8bae\uff1a<\/div>\n
iterator.__iter__()\u00a0 \u00a0 \u00a0\uff08\u4f7f\u7528dir\u67e5\u770b\u53ea\u6709\u8fd9\u4e2a\u7684\u662f\u53ef\u8fed\u4ee3\u5bf9\u8c61\uff09<\/div>\n
iterator.__next__()\u00a0 \u00a0\uff08\u4f7f\u7528dir\u67e5\u770b\u6709\u8fd9\u4e2a\u7684\u662f\u8fed\u4ee3\u5668\uff09<\/div>\n
<\/div>\n
\u53d6\u503c\uff1a<\/div>\n
next(iterator)<\/div>\n
iterator.__next__()<\/div>\n
\u6ce8\u610f\uff1a\u00a0\u5982\u679c\u8fed\u4ee3\u5668\u53d6\u503c\u5b8c\u4e4b\u540e\uff0c\u4f1a\u8fd4\u56deStoplteration\u9519\u8bef<\/div>\n
<\/div>\n
\u4ece\u53ef\u8fed\u4ee3\u5bf9\u8c61\u751f\u6210\u4e00\u4e2a\u8fed\u4ee3\u5668\uff1a<\/div>\n
\u8fed\u4ee3\u5668 =\u00a0iter(\u53ef\u8fed\u4ee3\u5bf9\u8c61)<\/div>\n
\u4e0b\u4e2a\u503c =\u00a0next(\u8fed\u4ee3\u5668)<\/div>\n
<\/div>\n
for\u5b9e\u73b0\u539f\u7406\uff1a<\/div>\n
li4 = [1,2,3,4,5,6,7,8,9,10]<\/div>\n
it = iter(li4)#\u9996\u5148\u5c06\u4e00\u4e2a\u5bf9\u8c61\u53d8\u6210\u53ef\u8fed\u4ee3\u7c7b\u578b<\/div>\n
while True:<\/div>\n
\u00a0\u00a0 \u00a0try:<\/div>\n
\u00a0\u00a0 \u00a0var = next(it)\u00a0 \u00a0 #\u4e00\u4e2a\u4e00\u4e2a\u53d6\u503c<\/div>\n
\u00a0\u00a0 \u00a0print(var)<\/div>\n
except StopIteration:\u00a0 \u00a0#\u76f4\u5230\u6ca1\u6709\u503c\uff0c\u5c31\u8df3\u51fa\u5faa\u73af<\/div>\n
\u00a0\u00a0 \u00a0break<\/div>\n
<\/div>\n
\u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668(\u638c\u63e1\u539f\u7406)\uff1a<\/div>\n
class Testlter:<\/div>\n
\u00a0 \u00a0 def __init__(self,li):<\/div>\n
\u00a0\u00a0 \u00a0\u00a0 \u00a0 self.li = li<\/div>\n
\u00a0\u00a0 \u00a0\u00a0 \u00a0 self.index = 0<\/div>\n
\u00a0 \u00a0 def __iter__(self):<\/div>\n
\u00a0\u00a0 \u00a0\u00a0 \u00a0 return self<\/div>\n
\u00a0 \u00a0 def __next__(self):<\/div>\n
\u00a0\u00a0 \u00a0\u00a0 \u00a0 if self.index < len(self.li):<\/div>\n
\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0 \u00a0 index\u00a0 = self.li[self.index]<\/div>\n
\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0 \u00a0 self.index += 1<\/div>\n
\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0 \u00a0 return index<\/div>\n
\u00a0\u00a0 \u00a0\u00a0 \u00a0 else:<\/div>\n
\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0\u00a0 \u00a0 raise StopIteration<\/div>\n
\u7b80\u5355\u539f\u7406\u8bb0\u5fc6\uff1a<\/div>\n
\u9996\u5148\u5b9a\u4e49init\u6765\u4f20\u5165\u53c2\u6570<\/div>\n
\u7136\u540e\u5fc5\u987b\u7528iter\u6765\u751f\u6210\u8fed\u4ee3\u5668<\/div>\n
\u7136\u540e\u8981\u6709next\u6765\u8fd4\u56de\u5f53\u524d\u8fd0\u884c\u5230\u54ea\u4e2aindex\u4e86<\/div>\n
next\u91cc\u8d85\u51falen\u4ee5\u540e\u5c31\u629b\u51fa\u5f02\u5e38<\/div>\n
<\/div>\n
\u751f\u6210\u5668\uff1a<\/div>\n
\u65b9\u6cd5\u4e00\uff1a\u5217\u8868\u63a8\u5bfc\u5f0f\u7684[]\u6539\u6210()<\/div>\n
b = (x for x in range(10))<\/div>\n
print(next(b))<\/div>\n
print(next(b))<\/div>\n
print(next(b))<\/div>\n
<\/div>\n
\u65b9\u6cd5\u4e8c\uff1a\u5728\u51fd\u6570\u91cc\u9762\u52a0\u4e0ayield<\/div>\n
def func(num):<\/div>\n
\u00a0\u00a0 \u00a0a = 0<\/div>\n
\u00a0\u00a0 \u00a0while a<num:<\/div>\n
\u00a0\u00a0 \u00a0\u00a0\u00a0 \u00a0yield a<\/div>\n
\u00a0\u00a0\u00a0\u00a0 \u00a0 \u00a0a +=1<\/div>\n
ge = func(10)<\/div>\n
print(next(ge))<\/div>\n
print(next(ge))<\/div>\n
print(next(ge))<\/div>\n
print(next(ge))<\/div>\n
\u751f\u6210\u5668\u4e0d\u4f1a\u4e00\u4e0b\u5b50\u628a\u6240\u6709\u5185\u5bb9\u751f\u6210\u51fa\u6765\uff0c\u5728\u6211\u4eec\u9700\u8981\u7684\u65f6\u5019\u7528next()\u53bb\u751f\u6210\uff0c\u53ef\u4ee5\u8282\u7701\u5185\u5b58\u7a7a\u95f4<\/div>\n
<\/div>\n
yield\u8fd0\u884c\u89c4\u5219<\/div>\n
\u6ce8\u610f\uff1a<\/div>\n
yield\u8868\u8fbe\u5f0f\u53ea\u80fd\u5728\u51fd\u6570\u4e2d\u4f7f\u7528<\/div>\n
yield\u8868\u8fbe\u5f0f\u53ef\u4ee5\u4f7f\u51fd\u6570\u6210\u4e3a\u4e00\u4e2a\u751f\u6210\u5668<\/div>\n
yield\u53ef\u4ee5\u8fd4\u56de\u8868\u8fbe\u5f0f\u7ed3\u679c\uff0c\u5e76\u4e14\u6682\u505c\u51fd\u6570\u6267\u884c\uff0c\u76f4\u5230next\u6fc0\u6d3b\u4e0b\u4e00\u4e2ayield<\/div>\n
<\/div>\n
<\/div>\n
\u7b80\u5355\u7406\u89e3\u751f\u6210\u5668\u5c31\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668<\/div>\n
python\u4f7f\u7528\u751f\u6210\u5668\u5bf9\u5ef6\u8fdf\u64cd\u4f5c\u63d0\u4f9b\u4e86\u652f\u6301\u3002\u6240\u8c13\u5ef6\u8fdf\u64cd\u4f5c\uff0c\u662f\u6307\u5728\u9700\u8981\u7684\u65f6\u5019\u624d\u4ea7\u751f\u7ed3\u679c\uff0c\u800c\u4e0d\u662f\u7acb\u5373\u4ea7\u751f\u7ed3\u679c\uff0c\u4ece\u800c\u8282\u7701\u4e86\u5927\u91cf\u7a7a\u95f4\uff0c\u8fd9<\/div>\n
\u4e5f\u662f\u751f\u6210\u5668\u7684\u4e3b\u8981\u597d\u5904\u3002<\/div>\n
<\/div>\n
<\/div>\n
\u6a21\u5757\uff1a<\/div>\n
\u5728python\u4e2d\uff0c\u6a21\u5757\u5c31\u662f\u4e00\u4e2apy\u6587\u4ef6\uff0c\u53ef\u4ee5\u4f7f\u7528\u4e0b\u9762\u4e24\u79cd\u65b9\u6cd5\u5bfc\u5165<\/div>\n
import\u00a0datetime<\/div>\n
from\u00a0datetime\u00a0import datetime (as dm)<\/div>\n
\u5728\u540c\u4e00\u76ee\u5f55\u4e0b\uff0c\u53ef\u76f4\u63a5\u4f7f\u7528\u4e0a\u9762\u4e24\u79cd\u65b9\u6cd5\u5bfc\u5165<\/div>\n
\u5728\u4e0d\u540c\u76ee\u5f55\u4e0b\uff0c\u9700\u8981\u4f7f\u7528sys.path\u6dfb\u52a0\u8def\u5f84<\/div>\n
sys.path.append(‘path’)<\/div>\n
<\/div>\n
\u5728python3\u4e2d\u5bfc\u5165\u540e\uff0c\u5728\u5f53\u524d\u8def\u5f84\u4e0b\u4f1a\u751f\u6210\u4e00\u4e2a__pycache__\u6587\u4ef6\u5939<\/div>\n
<\/div>\n
<\/div>\n
\u6590\u6ce2\u90a3\u5951\uff1a<\/div>\n
<\/div>\n
def feibonaqi(i,n):<\/div>\n
i1 = 0<\/div>\n
i2 = i<\/div>\n
count = 0<\/div>\n
while True:<\/div>\n
if count < n:<\/div>\n
count +=1<\/div>\n
b = i1+i2<\/div>\n
i1 = i2<\/div>\n
i2 = b<\/div>\n
yield b<\/div>\n
else:<\/div>\n
break<\/div>\n
<\/div>\n
<\/div>\n
import feibo<\/div>\n
aa = feibo.feibonaqi(1,20)<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
# li = []<\/div>\n
# for i in range(1,10):<\/div>\n
# li.append(i)<\/div>\n
# print(li)<\/div>\n
# ————————————–<\/div>\n
<\/div>\n
# li = [i for i in range(1,10)] #\u5fc5\u987b\u638c\u63e1<\/div>\n
# print(li)<\/div>\n
# —————————————–<\/div>\n
#\u5217\u8868\u63a8\u5bfc + \u6761\u4ef6\u5224\u65ad (\u5fc5\u987b\u638c\u63e1)<\/div>\n
# li2 = [i*10 for i in range(1,10) if i%2 ==0]<\/div>\n
# print(li2)<\/div>\n
# ——————————————–<\/div>\n
#\u5217\u8868\u63a8\u5bfc+\u4e09\u76ee\u8fd0\u7b97\u7b26 \uff08\u5fc5\u987b\u638c\u63e1\uff09<\/div>\n
# li3 = [i*100 if i%3 ==0 else i*10 for i in range(1,10) ]<\/div>\n
# print(li3)<\/div>\n
# ——————————————–<\/div>\n
#\u96c6\u5408\u63a8\u5bfc<\/div>\n
# se = {i for i in range(1,10)}<\/div>\n
# print(se)<\/div>\n
# —————————————<\/div>\n
#\u5b57\u5178\u63a8\u5bfc<\/div>\n
a = [1,2,3,4,5,6,7]<\/div>\n
# b = enumerate(a)#\u8fd9\u4e2a\u51fd\u6570\u662f\u4ec0\u4e48\u610f\u601d<\/div>\n
<\/div>\n
# di = {i:j for i,j in enumerate(a)}<\/div>\n
# print(di)<\/div>\n
# ————————————-<\/div>\n
<\/div>\n
# the_list = [5,4,3,2,1,]<\/div>\n
# for index in the_list:<\/div>\n
# print(index)<\/div>\n
#<\/div>\n
# var = None<\/div>\n
# index = 0<\/div>\n
# while index < len(the_list):<\/div>\n
# var = the_list[index]<\/div>\n
# print(var)<\/div>\n
# index +=1<\/div>\n
<\/div>\n
<\/div>\n
#for \u5b9e\u73b0\u539f\u7406\uff1a<\/div>\n
# li4 = [1,2,3,4,5,6,7,8,9,10]<\/div>\n
# it = iter(li4)#\u9996\u5148\u5c06\u4e00\u4e2a\u5bf9\u8c61\u53d8\u6210\u53ef\u8fed\u4ee3\u7c7b\u578b<\/div>\n
# while True:<\/div>\n
# try:<\/div>\n
# var = next(it)#<\/div>\n
# print(var)<\/div>\n
# except StopIteration:<\/div>\n
# break<\/div>\n
<\/div>\n
# \u81ea\u5b9a\u4e49\u8fed\u4ee3\u5668\uff1a<\/div>\n
# class Testlter:<\/div>\n
# def __init__(self,li):<\/div>\n
# self.li = li<\/div>\n
# self.index = 0<\/div>\n
# def __iter__(self):<\/div>\n
# return self<\/div>\n
# def __next__(self):<\/div>\n
# if self.index < len(self.li):<\/div>\n
# index = self.li[self.index]<\/div>\n
# self.index += 1<\/div>\n
# return index<\/div>\n
# else:<\/div>\n
# raise StopIteration<\/div>\n
<\/div>\n
#\u751f\u6210\u5668 1\uff0c \u5217\u8868\u63a8\u5bfc\u5f0f\u7684[]\u6539\u6210 ()<\/div>\n
# b = (x for x in range(10))<\/div>\n
# print(next(b))<\/div>\n
# print(next(b))<\/div>\n
# print(next(b))<\/div>\n
# 2,\u5728\u51fd\u6570\u91cc\u52a0\u4e0ayield<\/div>\n
# def func(num):<\/div>\n
# a = 0<\/div>\n
# while a<num:<\/div>\n
# yield a<\/div>\n
# a +=1<\/div>\n
# ge = func(10)<\/div>\n
# print(next(ge))<\/div>\n
# print(next(ge))<\/div>\n
# print(next(ge))<\/div>\n
# print(next(ge))<\/div>\n
<\/div>\n
import feibo<\/div>\n
aa = feibo.feibonaqi(1,20)<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
print(next(aa))<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n
<\/div>\n","protected":false},"excerpt":{"rendered":"

\u9b54\u6cd5\u65b9\u6cd5\u9700\u8981\u7279\u5b9a\u7684\u6761\u4ef6\u53bb\u89e6\u53d1 \u6709next\u662f\u8fed\u4ee3\u5668 # li = [] # for i in range(1,1 […]<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"open","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[22,23],"tags":[20],"class_list":["post-725","post","type-post","status-publish","format-standard","hentry","category-java","category-python_note","tag-python"],"blocksy_meta":[],"_links":{"self":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts\/725","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=725"}],"version-history":[{"count":1,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts\/725\/revisions"}],"predecessor-version":[{"id":726,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=\/wp\/v2\/posts\/725\/revisions\/726"}],"wp:attachment":[{"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=725"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Fcategories&post=725"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/notes.coremix.net\/index.php?rest_route=%2Fwp%2Fv2%2Ftags&post=725"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}