Python “extend” for a dictionary

>>> a = { "a" : 1, "b" : 2 }
>>> b = { "c" : 3, "d" : 4 }
>>> a 
{'a': 1, 'b': 2}
>>> b 
{'c': 3, 'd': 4}
I'm looking for an operation to obtain this avoiding for loop:
{ "a" : 1, "b" : 2, "c" : 3, "d" : 4 }
I wish to do something like:
a.extend(b) # This does not work

a = { "a" : 1, "b" : 2 }

b = { "c" : 3, "d" : 4 }

c={**a, **b}

print(c)

Note :

Python extend dictionary: The best way to extend a dictionary with another dictionary python is to use the dictionary comprehension with a dictionary mapping method:- a = { "a" : 1, "b" : 2 }.