如何在python字典中添加元素

x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}

x.pop(1)   #pop()，()里为需要删除的key值；即若x.pop(3)，则删除3:4元素。

print(x)

-->{0: 0, 2: 1, 3: 4, 4: 3}

x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}

del x[1]

print(x)

-->{0: 0, 2: 1, 3: 4, 4: 3}

 def remove_key(d, key):

r = dict(d)

del r[key]

return r

x = {1: 2, 3: 4, 4: 3, 2: 1, 0: 0}

print(remove_key(x, 1))

print(x)

-->{0: 0, 2: 1, 3: 4, 4: 3}

-->{0: 0, 1: 2, 2: 1, 3: 4, 4: 3}