Python: Generate an infinite cycle of elements from an iterable

Last update on May 28 2022 13:00:24 (UTC/GMT +8 hours)

Python Itertools: Exercise-5 with Solution

Write a Python program to generate an infinite cycle of elements from an iterable.
Note: Iterable should be a list or a string or a dictionary, etc.

Sample Solution:

Python Code:

import itertools as it
def cycle_data(iter):
    return it.cycle(iter)
# Following  loops will run for ever    
#List
result = cycle_data(['A','B','C','D'])
print("The said function print never-ending items:")
for i in result:
    print(i)

#String
result = cycle_data('Python itertools')
print("The said function print never-ending items:")
for i in result:
    print(i)

Sample Output:

The said function print never-ending items:
A
B
C
D
A
B
C
D
A
B
C
D
A
B
C
D
A
B
....

Python Code Editor:

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Previous: Write a Python program to construct an infinite iterator that returns evenly spaced values starting with a specified number and step.
Next: Write a Python program to make an iterator that drops elements from the iterable as soon as an element is a positive number.

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Python: Tips of the Day

Find current directory and file's directory:

To get the full path to the directory a Python file is contained in, write this in that file:

import os 
dir_path = os.path.dirname(os.path.realpath(__file__))

(Note that the incantation above won't work if you've already used os.chdir() to change your current working directory, since the value of the __file__ constant is relative to the current working directory and is not changed by an os.chdir() call.)

To get the current working directory use

import os
cwd = os.getcwd()

Documentation references for the modules, constants and functions used above:

The os and os.path modules.
The __file__ constant
os.path.realpath(path) (returns "the canonical path of the specified filename, eliminating any symbolic links encountered in the path")
os.path.dirname(path) (returns "the directory name of pathname path")
os.getcwd() (returns "a string representing the current working directory")
os.chdir(path) ("change the current working directory to path")

Ref: https://bit.ly/3fy0R6m