Thenewweek学习Python数据类型

name_list&＃61;[&＃39;Alex&＃39;,&＃39;jack&＃39;,&＃39;smone&＃39;,&＃39;1001&＃39;] #定义一个列表
name_list.append(&＃39;1001&＃39;) #添加值到最后一位
#del name_list[0] #删除某个索引的值
name_list[2]&＃61;&＃39;1001&＃39; #替换某个索引的值
#name_list.sort() #正序排列
name_list.pop() #删除最后一位元素
#name_list.remove(&＃39;Alex&＃39;) #删除特定元素
x&＃61;name_list.count(&＃39;1001&＃39;) #计算某一元素在列表内的个数
name_list[1:2]&＃61;[] #将1号元素删除为空
print(x)
print(name_list)
print(name_list[:-2]) #打印从0到-1之间的值
print(name_list[:1]) #打印从0到0的值
print(name_list[2:]) #打印从2到6之间的值
print(max(name_list)) #打印列表内最大的值

运行结果&＃xff1a;
2
[&＃39;Alex&＃39;, &＃39;1001&＃39;, &＃39;1001&＃39;]
[&＃39;Alex&＃39;]
[&＃39;Alex&＃39;]
[&＃39;1001&＃39;]
Alex

p&＃61;tuple() #创建一个元祖p
p&＃61;(&＃39;jack&＃39;,&＃39;11&＃39;,&＃39;22&＃39;,&＃39;Tom&＃39;)
print(type(p)) #查询格式
ret&＃61;p.count(&＃39;22&＃39;) #计算元素出现的次数
print(ret)
rat&＃61;p.index(&＃39;22&＃39;) #查询某个值的索引
print(rat)运行结果&＃xff1a;
<class &＃39;tuple&＃39;>
1
2

class dict(object):"""dict() -> new empty dictionarydict(mapping) -> new dictionary initialized from a mapping object&＃39;s(key, value) pairsdict(iterable) -> new dictionary initialized as if via:d &＃61; {}for k, v in iterable:d[k] &＃61; vdict(**kwargs) -> new dictionary initialized with the name&＃61;value pairsin the keyword argument list. For example: dict(one&＃61;1, two&＃61;2)"""def clear(self): # real signature unknown; restored from __doc__ #清除字典里的所有值""" D.clear() -> None. Remove all items from D. """passdef copy(self): # real signature unknown; restored from __doc__ #浅拷贝该字典""" D.copy() -> a shallow copy of D """pass&＃64;staticmethod # known casedef fromkeys(*args, **kwargs): # real signature unknown""" Returns a new dict with keys from iterable and values equal to value. """passdef get(self, k, d&＃61;None): # real signature unknown; restored from __doc__ """ D.get(k[,d]) -> D[k] if k in D, else d. d defaults to None. """passdef items(self): # real signature unknown; restored from __doc__ #一个keys和values对应的就是一个item""" D.items() -> a set-like object providing a view on D&＃39;s items """passdef keys(self): # real signature unknown; restored from __doc__ #取所有的key""" D.keys() -> a set-like object providing a view on D&＃39;s keys """passdef pop(self, k, d&＃61;None): # real signature unknown; restored from __doc__ #将某个key的value拿出来"""D.pop(k[,d]) -> v, remove specified key and return the corresponding value.If key is not found, d is returned if given, otherwise KeyError is raised"""passdef popitem(self): # real signature unknown; restored from __doc__ #将最后一组键值拿出来"""D.popitem() -> (k, v), remove and return some (key, value) pair as a2-tuple; but raise KeyError if D is empty."""passdef setdefault(self, k, d&＃61;None): # real signature unknown; restored from __doc__ #查找某个key的value&＃xff0c;若不存在该key则返回为none""" D.setdefault(k[,d]) -> D.get(k,d), also set D[k]&＃61;d if k not in D """pass def update(self, E&＃61;None, **F): # known special case of dict.update #将某个字典添加到另外一个字典中去"""D.update([E, ]**F) -> 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] &＃61; E[k]If E is present and lacks a .keys() method, then does: for k, v in E: D[k] &＃61; vIn either case, this is followed by: for k in F: D[k] &＃61; F[k]"""passdef values(self): # real signature unknown; restored from __doc__ #同keys()""" D.values() -> an object providing a view on D&＃39;s values """pass

dic&＃61;dict() #定义一个字典类型
dic&＃61;{&＃39;cod&＃39;:&＃39;sudo&＃39;,&＃39;xia&＃39;:&＃39;zha&＃39;,&＃39;you&＃39;:[&＃39;jack&＃39;,&＃39;22&＃39;]} #创建一个字典&＃xff0c;value可为列表或元祖
print(dic.keys()) #打印所有的key
d&＃61;dic.values() #定义value为d
print(d) #打印d&＃xff0c;即所有的values
dic[&＃39;name&＃39;]&＃61;&＃39;laji&＃39; #在右边添加key和value
dic[&＃39;cod&＃39;]&＃61;4 #更改某个key的值
a&＃61;dic.popitem() #取出最后一对键值
a1&＃61;dic.pop(&＃39;xia&＃39;) #删除key对应的value
dic1&＃61;{&＃39;k1&＃39;:&＃39;v1&＃39;}
b&＃61;dic.update(dic1) #将字典添加到另外一个字典里
print(dic)
c&＃61;dic.setdefault(&＃39;cod&＃39;) #查找某个key的value值
d&＃61;dic.setdefault(&＃39;llkl&＃39;) #若不存在返回none
print(dic)
print(a)
print(a1)
print(c)
print(d)运行结果&＃xff1a;
dict_keys([&＃39;cod&＃39;, &＃39;xia&＃39;, &＃39;you&＃39;])
dict_values([&＃39;sudo&＃39;, &＃39;zha&＃39;, [&＃39;jack&＃39;, &＃39;22&＃39;]])
{&＃39;cod&＃39;: 4, &＃39;you&＃39;: [&＃39;jack&＃39;, &＃39;22&＃39;], &＃39;k1&＃39;: &＃39;v1&＃39;}
{&＃39;cod&＃39;: 4, &＃39;you&＃39;: [&＃39;jack&＃39;, &＃39;22&＃39;], &＃39;k1&＃39;: &＃39;v1&＃39;, &＃39;llkl&＃39;: None}
(&＃39;name&＃39;, &＃39;laji&＃39;)
zha
4
None

a&＃61;set(&＃39;python&＃39;)
print(type(a)) #查看集合的类型
print(a)
a.add(&＃39;j&＃39;) #添加一个值到集合里
print(a)
a.remove(&＃39;o&＃39;) #移除一个值
print(a)
a.update(&＃39;jack&＃39;) #添加一个字符串到集合
print(a)
del a #删除

运行结果&＃xff1a;
<class &＃39;set&＃39;>
{&＃39;p&＃39;, &＃39;y&＃39;, &＃39;n&＃39;, &＃39;t&＃39;, &＃39;o&＃39;, &＃39;h&＃39;}
{&＃39;p&＃39;, &＃39;y&＃39;, &＃39;n&＃39;, &＃39;t&＃39;, &＃39;o&＃39;, &＃39;h&＃39;, &＃39;j&＃39;}
{&＃39;p&＃39;, &＃39;y&＃39;, &＃39;n&＃39;, &＃39;t&＃39;, &＃39;h&＃39;, &＃39;j&＃39;}
{&＃39;p&＃39;, &＃39;y&＃39;, &＃39;n&＃39;, &＃39;t&＃39;, &＃39;a&＃39;, &＃39;h&＃39;, &＃39;k&＃39;, &＃39;j&＃39;, &＃39;c&＃39;}