python基础数据类型汇总

I = ['太白',[1,2,3,],'WuSir','女神']<br>print(I[1])&nbsp; //[1,2,3]<br>print([-1])&nbsp; //'女神'<br>print([1:3])&nbsp; //[[1,2,3],'WuSir']<br>print([::2])&nbsp; //['太白','WuSir']<br>print([-1:-4:-1])&nbsp; //['女神','WuSir',[1,2,3]]<br>

增加

删除

修改

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其他操作方法

改

查

其他操作方法

dic = {'name':'太白','age':18}<br>dic['weight'] = 75&nbsp; //&nbsp; 没有weight这个键，就增加键值对<br>print(dic)&nbsp; //&nbsp; {'name':'太白','age',':18,'weight':75}<br>dic['name'] = 'barry'&nbsp; //&nbsp; 有name这个键，就成了字典的改值<br>print(dic)&nbsp; //&nbsp; {'name':'barry','age':18,'weight':75}

dic = {'name':'太白','age':18}<br>dic.setdefault('height',175)&nbsp; //&nbsp; 没有weight这个键，则添加<br>print(dic)&nbsp; //&nbsp; {'name':'太白','age':18,'height':175}<br>dic.setdefault('name','barry')&nbsp; //&nbsp; 有此键则不变<br>print(dic)&nbsp; //&nbsp; {'name':'太白','age':18,'height':175}

通过key删除字典的键值对，有返回值，可设置返回值。

3.5版本之前，popitem为随机删除，3.6之后为删除最后一个，有返回值

清空字典

通过键删除键值对

del&nbsp; dic&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 删除整个字典

dic = {'name':'太白','age':18}<br>del dic['name']<br>print(dic)&nbsp; //&nbsp; {'age':18}

源码： D.update([E, ]**F) -&gt; None. Update D from dict/iterable E and F. If E is present and has a .keys() method, then does: for k in E: D[k] = E[k]<br>If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v<br>In either case, this is followed by: for k in F: D[k] = F[k]

直接dic[key]（没有此键会报错）

get

dic = {'name': '太白', 'age': 18} print(dic.keys()) # dict_keys(['name', 'age'])

dic = {'name': '太白', 'age': 18} print(dic.values()) # dict_values(['太白', 18])

dic = {'name': '太白', 'age': 18} print(dic.items()) # dict_items([('name', '太白'), ('age', 18)])

dic = {'name': '太白', 'age': 18}<br>for key in dic:<br>print(key)<br>for k,v in dic.items():<br>print(k,v)

dic = dict.fromkeys('abcd','太白') print(dic) # {'a': '太白', 'b': '太白', 'c': '太白', 'd': '太白'}<br>dic = dict.fromkeys([1, 2, 3],'太白')<br>print(dic) # {1: '太白', 2: '太白', 3: '太白'}&nbsp;

浅copy

可用于索引，切片

字符串的操作方法（带颜色的标为重要方法）