Technically, a Pythoniterator objectmust implement two special methods,__iter__()and__next__(), collectively called theiterator protocol. Iterating Through an Iterator In Python, we can use thenext()function to return the next item in the sequence. Let's see an example, # define a listmy...
Example 1: Using Built-In Iterators Python has several built-in data types that support iteration, such as lists, tuples, strings, and dictionaries. These objects are iterable, meaning they can return an iterator using the iter() function. This example demonstrates how to convert a list into ...
In the code example, we use a built-in iterator on a string. In Python a string is an immutable sequence of characters. it = iter(text) The iter function returns an iterator on object. print(next(it)) The next function returns the next element from the iterable. ...
Creating an iterator in Python is easy. All you need to do is define a class that implements the iterator protocol. Here is an example:class MyIterator: def __init__(self, start, end): self.current = start self.end = end def __iter__(self): return self def __next__(self): ...
Example to create our own Python Iterator Here is an example to build our own iterator to display odd number from 1 to the max number supplied as the argument. class OddNum: """Class to implement iterator protocol""" def __init__(self, num = 0): self.num = num def __iter__(sel...
In the code example, we show a built-in iterator on a string. In Python a string is an immutable sequence of characters. The iter function returns an iterator on object. We can also use the list or tuple functions on iterators.
Example Code: Here I have created an iterator called ‘numbers’. I have put in a line of code to check its type. We are expecting the iteration to output all the numbers. However, I have asked it to print the 6th output, although there are only 5 values in the iterator. Let’s ...
In the__next__()method, we can add a terminating condition to raise an error if the iteration is done a specified number of times: Example Stop after 20 iterations: classMyNumbers: def__iter__(self): self.a =1 returnself def__next__(self): ...
>>> sum((x*x for x in range(10))) 285 When there is only one argument to the calling function, the parenthesis around generator expression can be omitted.>>> sum(x*x for x in range(10)) 285 Another fun example:Lets say we want to find first 10 (or any n) pythogorian ...
Python has several built-in objects, which implement the iterator protocol. For example lists, tuples, strings, dictionaries or files. (此处表述有些问题,严格地说上述python内建对象并不是迭代器,而是可迭代对象。因为它们本身并未实现next方法。只有在iter方法作用于这些对象之后,生成的新对象才具备next方法...