Some implementations of infinite / endless for loops in Python.

infinite_for_loops.py

"""
Some implementations of infinite / endless for loops in Python.
No practical applications, just pure theoretical interest :)

C/C++ example:
  for (;;) {}

src: https://stackoverflow.com/questions/5737196/an-expression-for-an-infinite-generator
"""
import itertools


def infinite_for_loop1():
    # iter(collection) -> iterator
    # iter(callable, sentinel) -> iterator
    #
    # Get an iterator from an object.  In the first form, the argument must
    # supply its own iterator, or be a sequence.
    # In the second form, the callable is called until it returns the sentinel.
    for _ in iter(int, 1):
        pass


def infinite_for_loop2():
    # Same as `infinite_for_loop1`
    for _ in iter(lambda: 0, 1):
        pass


#
# itertools examples
#

def infinite_for_loop3():
    # count(start=0, step=1) --> count object
    #
    # Return a count object whose .next() method returns consecutive values.
    # Equivalent to:
    #
    # def count(firstval=0, step=1):
    #     x = firstval
    #     while 1:
    #         yield x
    #         x += step
    for _ in itertools.count():
        pass


def infinite_for_loop4():
    # cycle(iterable) --> cycle object
    # Return elements from the iterable until it is exhausted.
    # Then repeat the sequence indefinitely.
    for _ in itertools.cycle(range(1)):
        pass


def infinite_for_loop5():
    # repeat(object [,times]) -> create an iterator which returns the object
    # for the specified number of times.  If not specified, returns the object
    # endlessly.
    for _ in itertools.repeat(0):
        pass