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)