World's Best AI Learning Platform with profoundly Demanding Certification Programs
Designed by IITians, only for AI Learners.
Download our e-book of Introduction To Python
Related Blog
Top Discussion
+256704300651- Psychic lost love Spell Caster // Divorce Spell // Marriage Proposal +256704300651 == WASHINGTON DC// TOP DEATH SPELLS @POWERFUL REVENGE DEATH SPELL CASTER IN USA,CANADA, UK, CALIFONIA, MEXICO, IRELAND, NY, CANADA, LONDON, SWEDEN, BOTSWANA Exception Type: JSONDecodeError at /update/ Exception Value: Expecting value: line 1 column 1 (char 0) How can I write Python code to change a date string from "mm/dd/yy hh: mm" format to "YYYY-MM-DD HH: mm" format? ((+256704300651}} INSTANT DEATH SPELL CASTER / REVENGE SPELL/ VOODOO A SPELL CASTER/╬ ₩௹]+256704300651₩௹]╬MAMA ZAMIE A TRADITIONAL HEALER /SANGOMA AND A SPIRITUAL HEALER in BELGIUM, +256704300651.. === Revenge Death spells caster In Denmark / Sweden / Germany / spell caster, revenge spell, spell caster review, witchcraft, psychic, magic forum. ↩⁜↪ +91-9352799565↩⁜↪ Divorce Problem Solution IN mumbai Join Discussion
Top Courses
Master's In Artificial Intelligence Job Guarantee Program
4.5 (1,292 Ratings)
559 Learners
Webinars
Why You Should Learn Data Science in 2023?
Jun 8th (7:00 PM) 289 Registered
Python Design Patterns - Singleton
Neha Kumawat
a year ago
This pattern restricts the instantiation of a class to one object. It is a type of creational pattern and involves only one class to create methods and specified objects.
It provides a global point of access to the instance created.
How to implement a singleton class?
The following program demonstrates the implementation of singleton class where it prints the instances created multiple times.
class Singleton:
__instance = None
@staticmethod
def getInstance():
""" Static access method. """
if Singleton.__instance == None:
Singleton()
return Singleton.__instance
def __init__(self):
""" Virtually private constructor. """
if Singleton.__instance != None:
raise Exception("This class is a singleton!")
else:
Singleton.__instance = self
s = Singleton()
print s
s = Singleton.getInstance()
print s
s = Singleton.getInstance()
print s
Output
The above program generates the following output −
The number of instances created are same and there is no difference in the objects listed in output.
Like the Blog, then Share it with your friends and colleagues to make this AI community stronger.
To learn more about nuances of Artificial Intelligence, Python Programming, Deep Learning, Data Science and Machine Learning, visit our insideAIML blog page.
Keep Learning. Keep Growing.