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  • python--生成器(generator)

    #生成器函数
    # def generator():
    #     print(1)
    #     return 'a'
    #
    # ret = generator()
    # print(ret)
    
    #只要含有yield关键字的函数都是生成器函数
    # yield不能和return共用且需要写在函数内
    # def generator():
    #     print(1)
    #     yield 'a'
    # #生成器函数 : 执行之后会得到一个生成器作为返回值
    # ret = generator()
    # print(ret)
    # print(ret.__next__())
    
    # def generator():
    #     print(1)
    #     yield 'a'
    #     print(2)
    #     yield 'b'
    #     yield 'c'
    # g = generator()
    # for i in g:
    #     print(i)
    # ret = g.__next__()
    # print(ret)
    # ret = g.__next__()
    # print(ret)
    # ret = g.__next__()
    # print(ret)
    
    #娃哈哈%i
    def wahaha():
        for i in range(2000000):
            yield '娃哈哈%s'%i
    # g = wahaha()
    # g1 = wahaha()
    # print(g.__next__())
    # print(g1.__next__())
    
    # g = wahaha()
    # count = 0
    # for i in g:
    #     count +=1
    #     print(i)
    #     if count > 50:
    #         break
    # # print('*******',g.__next__())
    # for i in g:
    #     count +=1
    #     print(i)
    #     if count > 100:
    #         break

    监听输入文件

    def tail(filename):
        f = open(filename,encoding='utf-8')
        while True:
            line = f.readline()
            if line.strip():
                yield line.strip()
    
    g = tail('file')
    for i in g:
        if 'python' in i:
            print('***',i)
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  • 原文地址:https://www.cnblogs.com/jsit-dj-it/p/11425811.html
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