字典a={“x”:1,“z”:3},
b={“y”:2,“z”:4},
请设计一个函My_Func(),
当My_Func(a,b)时输出c={“x”:1,“y”:2,“z”:3}，
当My_Func(b,a)时输出c={“x”:1,“y”:2,“z”:4}

import operator

a = {"x": 1, "z": 3}
b = {"y": 2, "z": 4}


def my_func(a, b):

    # 方法1:
    a.update(b)
    c = sorted(a.items, key=operator.itemgetter(1))
    print(c)

    # 方法2：
    c = {}
    for k in a.keys():
        c.setdefault(k, a[k])
    b1 = list(b.keys())
    c.setdefault(b1[0], b[b1[0]])
    c = sorted(c.items(), key=operator.itemgetter(1))
    print(c)
    
    # 方法3：
    d1 = list(a.keys())
    d2 = list(a.values())
    e1 = list(b.keys())
    e2 = b[e1[0]]
    d1.append(e1[0])
    d2.append(e2)
    d1.sort()
    d2.sort()
    c = {}
    for i in range(len(d1)):
        c.setdefault(d1[i], d2[i])
    print(c)

my_func(a, b)
my_func(b, a)