使用item()就有点类似于php里的foreach类似。都能把键=>值的方式遍历出来,如果纯使用for..in则只能取得每一对元素的key值 代码如下: person={'name':'lizhong','age':'26','city':'BeiJing','blog':'www.jb51.net'} for x in person: print x 执行结果:...
'age', 'height'])print(person.values())# dict_values(['王大锤', 25, 178])print(person.items())# dict_items([('name', '王大锤'), ('age', 25), ('height', 178)])forkey,valueinperson.items():print(f'{key}:\t{value}') ...
('goose', 3), ('duck', 4)] #输出都一样 >>> print(d1,d2,d3,sep='\n') {'cat': 0, 'dog': 1, 'bird': 2, 'goose': 3, 'duck': 4} {'cat': 0, 'dog': 1, 'bird': 2, 'goose': 3, 'duck': 4} {'cat': 0, 'dog': 1, 'bird': 2, 'goose': 3, 'duck'...
item=int(temp)#转换为数字 ifitem==4: print("|---感谢使用通讯录程序---|") break name=input("请输入联系人姓名:") ifitem==1: ifnameinaddressBook: print(name,':',addressBook[name]) continue else: print("该联系人不存在!") ifitem==2: ifnameinaddressBook: print("您输入的姓名在通讯录...
scores={"Alice":85,"Bob":92,"Charlie":78,"David":90}first_data=[itemforiteminscores.items()][0]student_name,score=first_dataprint("学生姓名:",student_name)print("成绩:",score) 1. 2. 3. 4. 5. 6. 7. 8. 代码执行的结果如下所示: ...
(self, item): key, value = item if key in self.data: self.data.move_to_end(key) self.data[key] = value def dequeue(self): try: return self.data.popitem(last=False) except KeyError: print("Empty queue") def __len__(self): return len(self.data) def __repr__(self): return ...
print sorted(dic.iteritems(), key=lambda d:d[1], reverse = False ) #[('d', 0), ('c', 3), ('asd', 4), ('bc', 5), ('a', 31), ('33', 56)] 解释如下: (1)、dic.iteritems(),返回字典键值对的元祖集合 print dic.iteritems() #<dictionary-itemiterator object at 0x00B71...
When the resultant getter receives the tuple, it returns the first item in the tuple—the value at index 0. If you call itemgetter() with an argument of 1, then it gets the value at index position 1.You can use this itemgetter as a key for the sorted() function:...
dict = {'Name': 'Runoob', 'Age': 7, 'Class': 'First'} dict11 = dict.copy()print(dict11)print("新复制的字典为 : ", dict11) dict1 = {'user': 'runoob', 'num': [1, 2, 3]} # 浅拷贝: 引用对象 赋值dict2 = dict1# 拷贝dict3 = dict1.copy() ...
The new element will appear in document order after the last existing subelement (or directly after the text, if it's the first subelement), but before the end tag for this element. """ self._assert_is_element(subelement) self._children.append(subelement) def extend(self, elements): 为...