[merge two dicts] #python

字典合并.md

Q

>>> x = {'a':1, 'b': 2}
>>> y = {'b':10, 'c': 11}
>>> z = x.update(y)
>>> print(z)
None
>>> x
{'a': 1, 'b': 10, 'c': 11}

如何合并字典且不改变x

A:

In Python 3.5 or greater, :

z = {**x, **y}

In Python 2, (or 3.4 or lower) write a function:

def merge_two_dicts(x, y):
    z = x.copy()   # start with x's keys and values
    z.update(y)    # modifies z with y's keys and values & returns None
    return z

z = merge_two_dicts(x, y)

python2

z = dict(x.items() + y.items())

python3

z = dict(list(x.items()) + list(y.items()))