When we are unsure about the number of agrument to pass in the function, we can use *args and **kwargs

Python *args : Non Keyword Arguments

• *args allow us to pass the variable number of non keyword arguments to function.
• In the function definition, we should use an asterisk * before the parameter name to pass variable length arguments. The arguments are passed as a tuple and these passed arguments make tuple inside the function with same name as the parameter excluding asterisk *.

	
	def addnumbers(*args):
		return sum(args)*.05

	addnumbers(40,60,20)
	




	
	def addnumbers(*num):
		sum = 0
		
		for n in num:
			sum = sum + n

		print("Sum is : "+ sum)

	adder(6,5)
	adder(6,7,8,4,8)
	

Python **kwargs : Keyword Arguments

• It allows us to pass the variable length of keyword arguments to the function.
• In the function definition, we should use double asterisk ** before the parameter name to pass variable length arguments. The arguments are passed as a dictionary and these arguments make a dictionary inside function with name same as the parameter excluding double asterisk **.

	
	def myfunc(**fr):
		if 'fruit' in fr:
			print(f"My favorite fruit is {fr['fruit']}")  
		else:
			print("I don't like fruit")
        
	myfunc(fruit='Mango')  # My favorite fruit is Mango
	
	myfunc()					# I don't like fruit
	

Python *args and **kwargs combined:

• We can pass *args and **kwargs into the same function, but *args have to appear before **kwargs. Otherwise it will throw an exception as "SyntaxError: positional argument follows keyword argument"

	
	def myfunc(*args, **kwargs):
		if 'fruit' and 'juice' in kwargs:
			print(f"I like {' and '.join(args)} and my favorite fruit is {kwargs['fruit']}")
			print(f"May I have some {kwargs['juice']} juice?")
		else:
			pass
        
	myfunc('eggs','spam',fruit='cherries',juice='orange')
	
	o/p:
	I like eggs and spam and my favorite fruit is cherries
	May I have some orange juice?