python iterator

Example Python program python-iterator.py Python version 3.x or newer. To check the Python version use:

python --version

Classes

• class NewNumbers:

Methods

• def iter(self):
• def next(self):

Code

Python example

# __iter__() returns the iterator object
# __next__() returns the next item in the sequence


# creating a list
new_list = [1, 2, 3, 7, 9]

# using iter()
new_iter = iter(new_list)

# print 1
print(next(new_iter))

# print 2
print(next(new_iter))

# print 3
print(new_iter.__next__())

# print 7
print(new_iter.__next__())

# print 9
print(new_iter.__next__())

# looping thru new_list
for element in new_list:
    print(element)

# build an iterator
class NewNumbers:
    def __iter__(self):
        self.a = 1
        return self

    def __next__(self):
        x = self.a
        self.a += 1
        return x

newclass = NewNumbers()
newiter = iter(newclass)

#print the iteration
print(next(newiter))
print(next(newiter))
print(next(newiter))
print(next(newiter))
print(next(newiter))

Useful Links

• Articles: https://python-commandments.org/
• Python shell: https://bsdnerds.org/learn-python/
• Tutorial: https://pythonprogramminglanguage.com/