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Add Singleton Pattern implementation in Python #6800

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Add Singleton Pattern implementation in Python #6800

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23 changes: 23 additions & 0 deletions code/design_pattern/src/singleton_pattern/singleton_pattern.py
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Original file line number Diff line number Diff line change
@@ -0,0 +1,23 @@
class SingletonClass:
_instance = None

def __new__(cls, *args, **kwargs):
if not cls._instance:
cls._instance = super(SingletonClass, cls).__new__(
cls, *args, **kwargs
)

return cls._instance

def foo(self):
print("bar")


# Usage
s1 = SingletonClass()
s2 = SingletonClass()

print(s1 is s2) # Output: True, both refer to the same instance

s1.foo() # Output: bar
s2.foo() # Output: bar