#!/usr/bin/python tinydict = {'Name': 'Runoob', 'Age': 7, 'Class': 'First'} print "tinydict['Alice']: ", tinydict['Alice']以上实例输出结果:tinydict['Alice']: Traceback (most recent call last): File "test.py", line 5, in <module> print "tinydict['Alice']: ", tinydict...
# 1.使用{} dic1 = {} # 空的字典 print(type(dic1)) # 输出:<class 'dict'> dic2 = { 'name':'王峰', 'sex':'男', 'hiredate':'1997-2-2', 'salary':'2000', 'job':'销售' } print(dic2) # 输出:{'name': '王峰', 'sex': '男', 'hiredate': '1997-2-2', 'salary'...
Pythondictionaryis a container of key-value pairs. It is mutable and can contain mixed types. A dictionary is an unordered collection. Python dictionaries are called associative arrays or hash tables in other languages. The keys in a dictionary must be immutable objects like strings or numbers. ...
<class 'list'> 2>使用 for in 循环遍历它们的返回值 举例 代码语言:python 代码运行次数:0 运行 AI代码解释 dict15 = {'a': 1, 'b': 2, 'c': 3} for key in dict15.keys(): print(key, end="") print('\n---') for value in dict15.values(): print(value, end="") print('...
在另外一个python文件中import了上面的a from test import a class test1: def add(self): b = '3' a.update({'d': b}) print(a) def add1(self): b = 4 a.update({'e':b}) print(a) if __name__ == '__main__': tst = test1() ...
dict = {'Name': 'Ligang', ‘Age’: 20, 'Class': 'Python'} del dict['Name'] # 如果字典带了key值，表示删除这一个元素 dict.clear() # 清空字典里面所有的内容，但是字典还在 del dict # 将字典这个对象从内存中彻底删除 五、字典键的特性：1）一个字典里面不能有两个相同的key值，后面...
11 Most Useful Python Dictionary Methods: In this tutorial, we will learn about the Python dictionary methods which are used for various dictionary operations such as insert, remove, get, update, etc.
Python的基本数据类型--Dictionary 字典是一组无序的集合,由key和vlaue组成,通过key映射你想要存储或者获取的内容, Python中的字典就像现实世界中的字典一样,都可以通过索引找到对应的值 如何创建字典 字典的创建方式和集合一样,也是在{}中用逗号隔开每组元素,不同的是字典中的每组元素有key:value组成,其中key是...
实例 #!/usr/bin/python dict = {'Name': 'Zara', 'Age': 7, 'Class': 'First'} print "dict['Alice']: ", dict['Alice'] 以上实例输出结果: dict['Alice']: Traceback (most recent call last): File "test.py", line 5, in <module> print "dict['Alice']: ", dict['Alice']KeyErr...
File "test.py", line 5, in <module> print "dict['Alice']: ", dict['Alice']KeyError: 'Alice'5. 1.2 修改字典 向字典添加新内容的方法是增加新的键/值对，修改或删除已有键/值对如下实例:#!/usr/bin/python dict = {'Name': 'Zara', 'Age': 7, 'Class': 'First'} dict['Age'] = ...