dic = {'k3': 'v3', 'k2': 'v2', 'k4': 'v4', 'k1': 'v1'}
for i in dic:
    print(i)
for i in dic:
    print(i, dic[i])
for i in dic:
    print(dic[i])
dic['k5'] = 'v5'
print(dic)
if dic.get('k5'):
    dic.pop('k5')
else:
    print(dic.get('k5'))
if dic.get('k5'):
    dic.pop('k5')
else:
    print(dic.get('k5'))
print(dic)
dic2 = {'k1':'v111','a':'b'}
print(dic2)
dic2.update(dic)
print(dic2)