Iterators in Python

1. What are iterators in Python?
2. What are iterators and generators in Python?
3. Why do we use iterator in python?
4. How do you write iterator in python?
5. What is __ init __ in Python?
6. Is string iterable Python?
7. Are generators iterable Python?
8. Is a list An iterable Python?
9. Which is faster iterator or generator?
10. What is slicing in Python?
11. What is the difference between Python arrays and lists?

What are iterators in Python?

An iterator is an object that can be iterated upon, meaning that you can traverse through all the values. ... Technically, in Python, an iterator is an object which implements the iterator protocol, which consist of the methods __iter__() and __next__() .

What are iterators and generators in Python?

Python generators are a simple way of creating iterators. All the work we mentioned above are automatically handled by generators in Python. Simply speaking, a generator is a function that returns an object (iterator) which we can iterate over (one value at a time).

Why do we use iterator in python?

An iterator is an object that can be iterated (looped) upon. It is used to abstract a container of data to make it behave like an iterable object. You probably already use a few iterable objects every day: strings, lists, and dictionaries to name a few.

How do you write iterator in python?

An iterator is the object that does the actual iterating. You can get an iterator from any iterable by calling the built-in iter function on the iterable. You can use the built-in next function on an iterator to get the next item from it (you'll get a StopIteration exception if there are no more items).

What is __ init __ in Python?

"__init__" is a reseved method in python classes. It is called as a constructor in object oriented terminology. This method is called when an object is created from a class and it allows the class to initialize the attributes of the class.

Is string iterable Python?

A String is an immutable sequence of bytes. Strings are iterable; iteration over a string yields each of its 1-byte substrings in order. But String doesn't implement Iterable 's Iterate method.

Are generators iterable Python?

A python iterator doesn't. Python generator saves the states of the local variables every time 'yield' pauses the loop in python. An iterator does not make use of local variables, all it needs is iterable to iterate on. A generator may have any number of 'yield' statements.

Is a list An iterable Python?

An object is called iterable if we can get an iterator from it. Most built-in containers in Python like: list, tuple, string etc. are iterables.

Which is faster iterator or generator?

From the timings above you can see that the generator function variant of the self-made range() iterator runs faster than the iterator class variant and when no optimization of code is involved this behavior propagates also into C-code level of C-code created by Cython.

What is slicing in Python?

Slicing in python means taking elements from one given index to another given index. We pass slice instead of index like this: [start:end] . We can also define the step, like this: [start:end:step] . If we don't pass start its considered 0. If we don't pass end its considered length of array in that dimension.

What is the difference between Python arrays and lists?

A list can be created using [] containing data values. Contents of lists can be easily merged and copied using python's inbuilt functions.
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