Python \u8fed\u4ee3\u5668<\/h1>\n

\u641e\u61c2Python\u51fd\u6570\u7684\u5b9a\u4e49\u4e0e\u8c03\u7528<\/span>\n <\/div>\n

\n \u8fed\u4ee3\u662fPython\u6700\u5f3a\u5927\u7684\u529f\u80fd\u4e4b\u4e00\uff0c\u662f\u8bbf\u95ee\u96c6\u5408\u5143\u7d20\u7684\u4e00\u79cd\u65b9\u5f0f\u3002\n <\/div>\n

\u8fed\u4ee3\u5668\u662f\u4e00\u4e2a\u53ef\u4ee5\u8bb0\u4f4f\u904d\u5386\u7684\u4f4d\u7f6e\u7684\u5bf9\u8c61\u3002<\/span>
\n \u8fed\u4ee3\u5668\u5bf9\u8c61\u4ece\u96c6\u5408\u7684\u7b2c\u4e00\u4e2a\u5143\u7d20\u5f00\u59cb\u8bbf\u95ee\uff0c\u76f4\u5230\u6240\u6709\u7684\u5143\u7d20\u88ab\u8bbf\u95ee\u5b8c\u7ed3\u675f\u3002\u8fed\u4ee3\u5668\u53ea\u80fd\u5f80\u524d\u4e0d\u4f1a\u540e\u9000\u3002<\/span>
\n \u8fed\u4ee3\u5668\u6709\u4e24\u4e2a\u57fa\u672c\u7684\u65b9\u6cd5\uff1aiter() \u548c next()\u3002<\/span>
\n \u5b57\u7b26\u4e32\uff0c\u5217\u8868\u6216\u5143\u7ec4\u5bf9\u8c61\u90fd\u53ef\u7528\u4e8e\u521b\u5efa\u8fed\u4ee3\u5668\uff1a<\/span> <\/p>\n

 list<\/span> = [\"dog\",\"cat\",\"cow\",\"lion\",\"wolf\"]<\/span>
 # \u521b\u5efa\u8fed\u4ee3\u5668\u5bf9\u8c61<\/span>
 it<\/span> = iter(list)<\/span>
 for<\/span> x in it:<\/span>
     print (x, end=\" \"<\/span>) <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\uff1a\n  <\/div>\n\ndog cat cow lion wolf<\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u4e5f\u53ef\u4ee5\u4f7f\u7528 next() \u51fd\u6570\uff1a\n  <\/div>\n\n import sys<\/span> # \u5f15\u5165 sys \u6a21\u5757<\/span>
 list<\/span> = [\"dog\",\"cat\",\"cow\",\"lion\",\"wolf\"]<\/span>
 # \u521b\u5efa\u8fed\u4ee3\u5668\u5bf9\u8c61<\/span>
 it<\/span> = iter(list)<\/span>
 while True:<\/span>
     try:<\/span>
         print (next(it)<\/span>)
     except StopIteration:<\/span>
         sys.exit()<\/span> <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\uff1a\n  <\/div>\n\ndog
cat
cow
lion
wolf<\/span><\/code><\/pre>\n<\/p><\/div>\n\u521b\u5efa\u4e00\u4e2a\u8fed\u4ee3\u5668<\/h2>\n\n    \u628a\u4e00\u4e2a\u7c7b\u4f5c\u4e3a\u4e00\u4e2a\u8fed\u4ee3\u5668\u4f7f\u7528\u9700\u8981\u5728\u7c7b\u4e2d\u5b9e\u73b0\u4e24\u4e2a\u65b9\u6cd5 __iter__() \u4e0e __next__() \u3002\n  <\/div>\n\n    \u5982\u679c\u4f60\u5df2\u7ecf\u4e86\u89e3\u7684\u9762\u5411\u5bf9\u8c61\u7f16\u7a0b\uff0c\u5c31\u77e5\u9053\u7c7b\u90fd\u6709\u4e00\u4e2a\u6784\u9020\u51fd\u6570\uff0cPython \u7684\u6784\u9020\u51fd\u6570\u4e3a __init__(), \u5b83\u4f1a\u5728\u5bf9\u8c61\u521d\u59cb\u5316\u7684\u65f6\u5019\u6267\u884c\u3002\n  <\/div>\n\n    __iter__() \u65b9\u6cd5\u8fd4\u56de\u4e00\u4e2a\u7279\u6b8a\u7684\u8fed\u4ee3\u5668\u5bf9\u8c61\uff0c \u8fd9\u4e2a\u8fed\u4ee3\u5668\u5bf9\u8c61\u5b9e\u73b0\u4e86 __next__() \u65b9\u6cd5\u5e76\u901a\u8fc7 StopIteration \u5f02\u5e38\u6807\u8bc6\u8fed\u4ee3\u7684\u5b8c\u6210\u3002\n  <\/div>\n\n    \u521b\u5efa\u4e00\u4e2a\u8fd4\u56de\u6570\u5b57\u7684\u8fed\u4ee3\u5668\uff0c\u521d\u59cb\u503c\u4e3a 1\uff0c\u9010\u6b65\u9012\u589e 1\uff1a\n  <\/div>\n\n class<\/span> NumberCount:<\/span>
     def<\/span> __iter__(self):<\/span>
         self.number<\/span> = 1<\/span>
         return<\/span> self<\/span>

     def<\/span> __next__(self):<\/span>
         x<\/span> = self.number<\/span>
         self.number<\/span> += 1<\/span>
         return<\/span> x<\/span>

 y<\/span> = NumberCount()<\/span>
 z<\/span> = iter(y)<\/span>
 print(next(z)<\/span>)
 print(next(z)<\/span>)
 print(next(z)<\/span>) <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\uff1a\n  <\/div>\n\n1
2
3<\/span><\/code><\/pre>\n<\/p><\/div>\nStopIteration<\/h2>\n\n    StopIteration \u5f02\u5e38\u7528\u4e8e\u6807\u8bc6\u8fed\u4ee3\u7684\u5b8c\u6210\uff0c\u9632\u6b62\u51fa\u73b0\u65e0\u9650\u5faa\u73af\u7684\u60c5\u51b5\uff0c\u5728 __next__() \u65b9\u6cd5\u4e2d\u6211\u4eec\u53ef\u4ee5\u8bbe\u7f6e\u5728\u5b8c\u6210\u6307\u5b9a\u5faa\u73af\u6b21\u6570\u540e\u89e6\u53d1 StopIteration \u5f02\u5e38\u6765\u7ed3\u675f\u8fed\u4ee3\u3002 \u5728 5 \u6b21\u8fed\u4ee3\u540e\u505c\u6b62\u6267\u884c\uff1a\n  <\/div>\n\n class<\/span> NumberCount:<\/span>
     def<\/span> __iter__(self):<\/span>
         self.number<\/span> = 1<\/span>
         return<\/span> self<\/span>

     def<\/span> __next__(self):<\/span>
         if<\/span>  self.number<\/span> <= 5:
             x<\/span> = self.number<\/span>
             self.number<\/span> += 1<\/span>
             return<\/span> x<\/span>
         else<\/span>:
             raise StopIteration<\/span>
 y<\/span> = NumberCount()<\/span>
 z<\/span> = iter(y)<\/span>
 for<\/span> x in z:<\/span>
     print(x) <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\uff1a\n  <\/div>\n\n1
2
3
4
5<\/span><\/code><\/pre>\n<\/p><\/div>\n\u751f\u6210\u5668<\/h2>\n\n    \u5728 Python \u4e2d\uff0c\u4f7f\u7528\u4e86 yield \u7684\u51fd\u6570\u88ab\u79f0\u4e3a\u751f\u6210\u5668\uff08generator\uff09\u3002\n  <\/div>\n\n    \u8ddf\u666e\u901a\u51fd\u6570\u4e0d\u540c\u7684\u662f\uff0c\u751f\u6210\u5668\u662f\u4e00\u4e2a\u8fd4\u56de\u8fed\u4ee3\u5668\u7684\u51fd\u6570\uff0c\u53ea\u80fd\u7528\u4e8e\u8fed\u4ee3\u64cd\u4f5c\uff0c\u66f4\u7b80\u5355\u70b9\u7406\u89e3\u751f\u6210\u5668\u5c31\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\u3002\n  <\/div>\n\n    \u5728\u8c03\u7528\u751f\u6210\u5668\u8fd0\u884c\u7684\u8fc7\u7a0b\u4e2d\uff0c\u6bcf\u6b21\u9047\u5230 yield \u65f6\u51fd\u6570\u4f1a\u6682\u505c\u5e76\u4fdd\u5b58\u5f53\u524d\u6240\u6709\u7684\u8fd0\u884c\u4fe1\u606f\uff0c\u8fd4\u56de yield \u7684\u503c, \u5e76\u5728\u4e0b\u4e00\u6b21\u6267\u884c next() \u65b9\u6cd5\u65f6\u4ece\u5f53\u524d\u4f4d\u7f6e\u7ee7\u7eed\u8fd0\u884c\u3002\n  <\/div>\n\n    \u8c03\u7528\u4e00\u4e2a\u751f\u6210\u5668\u51fd\u6570\uff0c\u8fd4\u56de\u7684\u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\u5bf9\u8c61\u3002\n  <\/div>\n\n    \u4ee5\u4e0b\u5b9e\u4f8b\u4f7f\u7528 yield \u5b9e\u73b0\u6590\u6ce2\u90a3\u5951\u6570\u5217\uff1a\n  <\/div>\n\n import sys<\/span> # \u5f15\u5165 sys \u6a21\u5757<\/span>
 def<\/span> fibonacci(n):<\/span>  # \u751f\u6210\u5668\u51fd\u6570 - \u6590\u6ce2\u90a3\u5951<\/span>
     a, b, counter<\/span> = 0, 1, 0<\/span>
     while True:<\/span>
         if (counter > n<\/span>):
             return<\/span>
         yield a<\/span>
         a, b<\/span> = b, a + b<\/span>
         counter<\/span> += 1<\/span>

 f<\/span> = fibonacci(10)<\/span>  # f \u662f\u4e00\u4e2a\u8fed\u4ee3\u5668\uff0c\u7531\u751f\u6210\u5668\u8fd4\u56de\u751f\u6210<\/span>
 while True:<\/span>
     try:<\/span>
         print (next(f), end=\" \"<\/span>)
     except StopIteration:<\/span>
         sys.exit()<\/span> <\/span><\/code><\/pre>\n<\/p><\/div>\n\n    \u6267\u884c\u7ed3\u679c\uff1a\n  <\/div>\n\n0 1 1 2 3 5 8 13 21 34 55<\/span><\/code><\/pre>\n<\/p><\/div>\n <\/body>
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