Write a Python program defining a function `greet_user(name, greeting=’Hello’)` that prints `[greeting], [name]!`.
A name string.
Print the greeting message.
Non-empty string name
John
Hello, John!
Default arguments are used if no value is provided for that parameter during the call.
def greet_user(name, greeting='Hello'):
# Write your code here
pass
name = input()
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