Python iter() method (original) (raw)
Last Updated : 11 Dec, 2024
Python iter() method is a built-in method that allows to create an iterator from an iterable. An iterator is an object that enables us to traverse through a collection of items one element at a time. Let’s start by understanding how iter() works with a simple example.
Python `
a = [10, 20, 30, 40]
Convert the list into an iterator
iterator = iter(a)
Access elements using next()
print(next(iterator))
print(next(iterator))
`
Table of Content
Syntax of
iter()methoditerator = iter(iterable)
**Parameters
iterable: Any object capable of returning its elements one at a time. Examples include lists, tuples, dictionaries, and strings.**Return Type
- Returns an **iterator object that can be used with the
next()function or aforloop to access the elements sequentially.
**Examples of iter() Method
**Using iter() with String
Python `
Convert string to iterator
s = "Python" iterator = iter(s)
print(next(iterator))
print(next(iterator))
`
**Using iter() with Dictionary
Python `
d = {'a': 1, 'b': 2, 'c': 3} iterator = iter(d)
for key in iterator: print(key)
`
**Using iter() with Callable and Sentinel
Python `
Generate numbers until sentinel value is encountered
import random
iterator = iter(lambda: random.randint(1, 5), 3) for num in iterator: print(num)
`
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