PYTHON

args kwargs python

>>> def argsKwargs(*args, **kwargs):
...     print(args)
...     print(kwargs)
... 
>>> argsKwargs('1', 1, 'slgotting.com', upvote='yes', is_true=True, test=1, sufficient_example=True)
('1', 1, 'slgotting.com')
{'upvote': 'yes', 'is_true': True, 'test': 1, 'sufficient_example': True}

use of kwargs and args in python classes

def myFun(*args,**kwargs): 
    print("args: ", args) 
    print("kwargs: ", kwargs) 
    
myFun('my','name','is Maheep',firstname="Maheep",lastname="Chaudhary")

# *args - take the any number of argument as values from the user 
# **kwargs - take any number of arguments as key as keywords with 
# value associated with them

python *args

# *args is a Variable Length Argument of type Tuple,
# which takes any number of parameters, including 0 number of arguments as well.
def variableLengthArguments(*args):
  print (sum(args))

variableLengthArguments() # Output: 0
variableLengthArguments(10) # Output: 10
variableLengthArguments(10, 20) # Output: 30
variableLengthArguments(10, 20, 30, 50, 90) # Output: 200

Kwargs in python

def tester(**kwargs):
   for key, value in kwargs.items():
       print(key, value, end = " ")
tester(Sunday = 1, Monday = 2, Tuesday = 3, Wednesday = 4)

args in python

def add(*args):
    total = 0
    for i in args:
        total += i
    
    return total

print(add(5,5,10))

args in python

def mul(*args):  # args as argument
    multiply = 1
    for i in args:
        multiply *= i
        
    return multiply

lst = [4,4,4,4]
tpl = (4,4,4,4)    

print(mul(*lst))  # list unpacking
print(mul(*tpl)) # tuple unpacking

what are args and kwargs in python

# Python program to illustrate   
# **kwargs for variable number of keyword arguments 
  
def info(**kwargs):  
    for key, value in kwargs.items(): 
        print ("%s == %s" %(key, value)) 
  
# Driver code 
info(first ='This', mid ='is', last='Me')     

args in python

def func(*args):
    x = []          # emplty list
    for i in args:
        i = i * 2
        x.append(i)  
        y = tuple(x) # converting back list into tuple
    return y
        
tpl = (2,3,4,5)        
print(func(*tpl))

python *args and **kwargs

def foo(*args):
    for a in args:
        print(a)        

foo(1)
# 1

foo(1,2,3)
# 1
# 2
# 3

args in python

# if args is not passed it return message
# "Hey you didn't pass the arguements"

def ech(nums,*args):
    if args:
        return [i ** nums for i in args]  # list comprehension
    else:
        return "Hey you didn't pass args"
    
print(ech(3,4,3,2,1))

kwargs in python

def display(**kwargs):
    d = {k.upper():v.upper() for k,v in kwargs.items() }
    return d
   
d = {"name":"neo","age":"33","city":"tokyo"}
print(display(**d))

*kwargs

# Python program to illustrate 
# *kwargs for variable number of keyword arguments
 
def myFun(**kwargs):
    for key, value in kwargs.items():
        print ("%s == %s" %(key, value))
 
# Driver code
myFun(first ='Geeks', mid ='for', last='Geeks') 

''' output: 
last == Geeks
mid == for
first == Geeks
'''

args in python

# normal parameters with *args

def mul(a,b,*args): # a,b are normal paremeters
    multiply = 1
    for i in args:
        multiply *= i
        
    return multiply

print(mul(3,5,6,7,8))   # 3 and 5 are being passed as a argument but 6,7,8 are args 

**kwargs python

def calculate(n, **kwargs):
	n += kwargs["add"]
	n *= kwargs["multiply"]
	return n

print(calculate(3, add=3, multiply=5)) # (3+3)*5 = 30

args in python

def wrap(*args):
        lis = list(args)  # it is important to convert args into list before looping, args take tuple as a argument 
        for i in range(len(lis)):
            lis[i] = lis[i] * 2
        args = tuple(lis)
        return args
print(wrap(2,3,4,5,6))

kwargs in python

def display2(a,b,c):
    print("kwarg1:", a)
    print("kwarg2:", b)
    print("kwarg3:", c)

d = {"a": 1, "b": 2, "c": 3}
display2(**d)

args in python

def func2(*args):
    for i in args:
        print(i * 2)
        
func2(2,3,4,5)

args in python

def display(a,b,c):
    print("arg1:", a)
    print("arg2:", b)
    print("arg3:", c)

lst = [2,3]
display(1,*lst)

args in python

# if args is not passed it return message
# "Hey you didn't pass the arguements"

def ech(num,*args):  
    if args:
        a = []
        for i in args:
            a.append(i**num)
        return a                 # return should be outside loop
    else:
        return "Hey you didn't pass the arguements"     # return should be outside loop
    
print(ech(3))

**kwargs,*args

def myFun(arg1, arg2, arg3):
    print("arg1:", arg1)
    print("arg2:", arg2)
    print("arg3:", arg3)
 
 
# Now we can use *args or **kwargs to
# pass arguments to this function :
args = ("Geeks", "for", "Geeks")
myFun(*args)
 
kwargs = {"arg1": "Geeks", "arg2": "for", "arg3": "Geeks"}
myFun(**kwargs)

**kwargs

*args and **kwargs in Python are used in  a function that doesn't have
a specified number of arguments (parameters).

**kwargs in Python

def myFun(arg1, **kwargs):
    for key, value in kwargs.items():
        print("%s == %s" % (key, value))
 
 
# Driver code
myFun("Hi", first='Geeks', mid='for', last='Geeks')

*args in Python

def myFun(arg1, *argv):
    print("First argument :", arg1)
    for arg in argv:
        print("Next argument through *argv :", arg)
 
 
myFun('Hello', 'Welcome', 'to', 'GeeksforGeeks')