Iterating Over Collections

• Iterators are commonly used to iterate over collections like lists, tuples, dictionaries, etc.

my_list = [1, 2, 3, 4, 5]
for item in my_list:
    print(item)

Iterator Protocol

• Iterators implement the iterator protocol, which consists of two methods: __iter__() and next(). The iter() method returns the iterator object itself, and next() returns the next item in the sequence.

my_iter = iter(my_list)
print(next(my_iter))  # Output: 1
print(next(my_iter))  # Output: 2

Built-in Iterators:

• Python provides several built-in iterators and functions to work with iterators, such as range(), enumerate(), zip(), etc.

for i in range(5):
    print(i)  # Output: 0 1 2 3 4

for index, value in enumerate(my_list):
    print(index, value)