Объединение словарей

dct1 = dict(zip(range(4), 'abcd'))
print(dct1)
dct2 = dict(zip(range(2,6), 'efgh'))
print(dct2)
 
print({**dct2, **dct1})

d1={"q":111, "w":222, "r":333}
d2={"r":444, "t":555, "y":666}
 
def foo(d1,d2):
    d={}
    for k,v in d1.items():
        d[k]=v
    for k,v in d2.items():
        if not d.get(k):
            d[k]=v
    return d        
        
print(foo(d1,d2))

def foo(d1, d2):
    d = {}
    d.update(d2)
    d.update(d1)
    return d
 
 
dct1 = dict(zip(range(4), 'abcd'))
print(dct1)
dct2 = dict(zip(range(2, 6), 'efgh'))
print(dct2)
 
d = foo(dct1, dct2)
print(d)

dict1={"q":111, "w":222, "r":333}
dict2={"q":444, "t":555, "y":666}
 
def plus(dict1,dict2):
    dict={}
    for k,v in dict1.items():
        dict[k]=v
    for k,v in dict2.items():
        if not dict.get(k):
            dict[k]=v
    return dict        
        
print(plus(dict1,dict2))

>>> dict1={"q":111, "w":222, "r":333}
>>> dict2={"q":444, "t":555, "y":666}
>>> def plus (dict1, dict2):
...     return {**dict1, **dict2}
... 
>>> plus(dict1, dict2)
{'q': 444, 'w': 222, 'r': 333, 't': 555, 'y': 666}

def plus(d1, d2):
    d = {}
    d.update(d1)
    d.update(d2)
    return d
 
 
dict1 = {"q": 111, "w": 222, "r": 333}
dict2 = {"q": 444, "t": 555, "y": 666}
 
d = plus(dict1, dict2)
print(d)