when to use a iterator in python code example

Example 1: python how to use iter

s = 'hello'
s_iter = iter(s) #Changes the string to an iterator
print(next(s_iter)) #Will print h
print(next(s_iter)) #Will print e
print(next(s_iter)) #Will print l
print(next(s_iter)) #Will print l
print(next(s_iter)) #will print o

Example 2: python iterator

pies = ["cherry", "apple", "pumpkin", "pecan"]

iterator = iter(pies)

print(next(iterator))
#prints "cherry" because it's the current one being iterated over