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How are arguments passed by value or by reference in Python?
Python uses a mechanism, which is known as "Call-by-Object", sometimes also called "Call by Object Reference" or "Call by Sharing"
If you pass immutable arguments like integers, strings or tuples to a function, the passing acts like Call-by-value. It's different, if we pass mutable arguments.
All parameters (arguments) in the Python language are passed by reference. It means if you change what a parameter refers to within a function, the change also reflects back in the calling function.
Example
student={'Archana':28,'krishna':25,'Ramesh':32,'vineeth':25} def test(student): new={'alok':30,'Nevadan':28} student.update(new) print("Inside the function",student) return test(student) print("outside the function:",student)
Output
Inside the function {'Archana': 28, 'krishna': 25, 'Ramesh': 32, 'vineeth': 25, 'alok': 30, 'Nevadan': 28} outside the function: {'Archana': 28, 'krishna': 25, 'Ramesh': 32, 'vineeth': 25, 'alok': 30, 'Nevadan': 28}
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