从PyGen_Type这个对象对tp_iter,tp_iternext的设置来看,说明generator是实现了iterator protocol了,可以在for 语句中迭代它。 2.PyCodeObject、PyFrameObject,PyFunctionObject 3.PyGenObject typedef struct { PyObject_HEAD /* The gi_ prefix is intended to remind of generator-iterator. */ /* Note: gi_fr...
同样的,把函数改成generator后,我们基本上从来不会⽤ next() 来获取下⼀个返回值,⽽是直接使⽤ for 循环来迭代: 但是⽤for循环调⽤generator时,发现拿不到generator的return语句的返回值。如果想要拿到返回值,必须捕获 StopIteration错误,返回值包含在StopIteration的value中: def fib_a(times): # 初始化...
或者使用for循环直接迭代生成器对象: for value in simple_generator(): print(value) # 输出: 1, 2, 3, 4, 5 三、生成器的优势 内存效率:生成器无需一次性地在内存中存储所有值,而是在需要时逐个生成值。这对于处理大量数据或无限数据流非常有用。 惰性求值:生成器允许你实现惰性求值,即只在需要时才计算...
True >>> iter(odd_num) is odd_num True >>> help(odd_num) Help on generator object: odd = class generator(object) | Methods defined here: | | __iter__(self, /) | Implement iter(self). | | __next__(self, /) | Implement next(self). ...看到上面...
g = (x for x in range(10)) help(g) Help on generator object: <genexpr> = class generator(object) | Methods defined here: | | __del__(...) | | __getattribute__(self, name, /) | Return getattr(self, name). | | __iter__(self, /) | Implement iter(self). | | __next...
在python中 coroutine(协程)被称为的generator,这两个东西在python其实是同一个东东,之所以如此称呼是因为它有迭代器的功能,但是又可以只消耗很少的内存。不吃能存,又产生数据,称为generator还是很符合状况的。 Python中的generotor是一种PyFunctionCode 和PyFrameObject的包装,这个生成器是有自己独立 value stack 的...
>>> y=(x for x in "abc") >>> type(y) <class 'generator'> >>> print(y) <generator object <genexpr> at 0x7f93e0276740> >>> next(y) 'a' >>> next(y) 'b' >>> next(y) 'c' >>> next(y) Traceback (most recent call last): File "<stdin>", line 1, in <module> ...
Instead of using a for loop, you can also call next() on the generator object directly. This is especially useful for testing a generator in the console: Python >>> gen = infinite_sequence() >>> next(gen) 0 >>> next(gen) 1 >>> next(gen) 2 >>> next(gen) 3 Here, you ha...
set([<generator object <genexpr> at 0x1004d5280>, <generator object <genexpr> at 0x1004d5320>, <generator object <genexpr> at 0x1004d5370>]) 我期望的是 set(['e','I','u','o','v','l','y') 谁能告诉我导致这个问题的原因?江户...
Runtime error (TypeErrorException): 'generator' object is unsubscriptable Traceback: line 26, in getStandardDeviation, "<string>" line 44, in calculate, "<string>" line 54, in script Any help pointing out why I am getting this error and how I can fix it would be most appreciated, al...