In [1]:

    

default = {'a': 1, 'b': 2}
override = {'a': 3, 'c': 4}


    

In [2]:

    

# previous way
final = default.copy()
final.update(override)
final


    

    
Out[2]:





{'a': 3, 'b': 2, 'c': 4}

In [4]:

    

# with PEP 448
final = {**default, **override}
final


    

    
Out[4]:





{'a': 3, 'b': 2, 'c': 4}

In [7]:

    

final = {'a': 1, 'b': 2, **override}


    

In [1]:

    

a = [1, 2, 3]
b = (4, 5, 6)
c = 'seven'  # alone
d = (x ** 3 for x in range(2, 5))
e = {'a': None, 'b': False}


    

In [2]:

    

joint = a + b


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-2-166c4836e45e> in <module>()
----> 1 joint = a + b

TypeError: can only concatenate list (not "tuple") to list

In [3]:

    

joint = a + list(b) + [c] + list(d) + sorted(e)
joint


    

    
Out[3]:





[1, 2, 3, 4, 5, 6, 'seven', 8, 27, 64, 'a', 'b']

In [22]:

    

joint = [*a, *b, c, *d, *sorted(e)]


    

In [21]:

    

joint


    

    
Out[21]:





[1, 2, 3, 4, 5, 6, 'seven', 'b', 'a']

In [28]:

    

'a: {} b: {} c: {}'.format(*[1, 2], 3)


    

    
Out[28]:





'a: 1 b: 2 c: 3'

In [31]:

    

[(*t, 'love') for t in final.items()]


    

    
Out[31]:





[('b', 2, 'love'), ('a', 3, 'love'), ('c', 4, 'love')]

In [7]:

    

def f(*args, **kwargs):
    return args, kwargs


    

In [8]:

    

f(**{'x': 2}, **{'x': 3})


    

    




---------------------------------------------------------------------------
TypeError                                 Traceback (most recent call last)
<ipython-input-8-56c423ed66fe> in <module>()
----> 1 f(**{'x': 2}, **{'x': 3})

TypeError: f() got multiple values for keyword argument 'x'

In [9]:

    

f(**{**{'x': 2}, **{'x': 3}})


    

    
Out[9]:





((), {'x': 3})

In [ ]: