一.基本数据类型
整数:int
字符串:str(注:\\t等于一个tab键)
布尔值: bool
列表:list
列表用[]
元祖:tuple
元祖用()
字典:dict
注:所有的数据类型都存在想对应的类列里,元祖和列表功能一样,列表可以修改,元祖不能修改。
二.字典所有数据类型:
常用操作:
索引、新增、删除、键、值、键值对、循环、长度
class dict(object): \"\"\" dict() -> new empty dictionary dict(mapping) -> new dictionary initialized from a mapping object\'s (key, value) pairs dict(iterable) -> new dictionary initialized as if via: d = {} for k, v in iterable: d[k] = v dict(**kwargs) -> new dictionary initialized with the name=value pairs in the keyword argument list. For example: dict(one=1, two=2) \"\"\" def clear(self): # real signature unknown; restored from __doc__ \"\"\" D.clear() -> None. Remove all items from D. \"\"\" pass def copy(self): # real signature unknown; restored from __doc__ \"\"\" D.copy() -> a shallow copy of D \"\"\" pass @staticmethod # known case def fromkeys(*args, **kwargs): # real signature unknown \"\"\" Returns a new dict with keys from iterable and values equal to value. \"\"\" pass def get(self, k, d=None): # real signature unknown; restored from __doc__ \"\"\" D.get(k[,d]) -> D[k] if k in D, else d. d defaults to None. \"\"\" pass def items(self): # real signature unknown; restored from __doc__ \"\"\" D.items() -> a set-like object providing a view on D\'s items \"\"\" pass def keys(self): # real signature unknown; restored from __doc__ \"\"\" D.keys() -> a set-like object providing a view on D\'s keys \"\"\" pass def pop(self, k, d=None): # real signature unknown; restored from __doc__ \"\"\" 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 \"\"\" pass def popitem(self): # real signature unknown; restored from __doc__ \"\"\" D.popitem() -> (k, v), remove and return some (key, value) pair as a 2-tuple; but raise KeyError if D is empty. \"\"\" pass def setdefault(self, k, d=None): # real signature unknown; restored from __doc__ \"\"\" D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D \"\"\" pass def update(self, E=None, **F): # known special case of dict.update \"\"\" 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] = E[k] If E is present and lacks a .keys() method, then does: for k, v in E: D[k] = v In either case, this is followed by: for k in F: D[k] = F[k] \"\"\" pass def values(self): # real signature unknown; restored from __doc__ \"\"\" D.values() -> an object providing a view on D\'s values \"\"\" pass def __contains__(self, *args, **kwargs): # real signature unknown \"\"\" True if D has a key k, else False. \"\"\" pass def __delitem__(self, *args, **kwargs): # real signature unknown \"\"\" Delete self[key]. \"\"\" pass def __eq__(self, *args, **kwargs): # real signature unknown \"\"\" Return self==value. \"\"\" pass def __getattribute__(self, *args, **kwargs): # real signature unknown \"\"\" Return getattr(self, name). \"\"\" pass def __getitem__(self, y): # real signature unknown; restored from __doc__ \"\"\" x.__getitem__(y) <==> x[y] \"\"\" pass def __ge__(self, *args, **kwargs): # real signature unknown \"\"\" Return self>=value. \"\"\" pass def __gt__(self, *args, **kwargs): # real signature unknown \"\"\" Return self>value. \"\"\" pass def __init__(self, seq=None, **kwargs): # known special case of dict.__init__ \"\"\" dict() -> new empty dictionary dict(mapping) -> new dictionary initialized from a mapping object\'s (key, value) pairs dict(iterable) -> new dictionary initialized as if via: d = {} for k, v in iterable: d[k] = v dict(**kwargs) -> new dictionary initialized with the name=value pairs in the keyword argument list. For example: dict(one=1, two=2) # (copied from class doc) \"\"\" pass def __iter__(self, *args, **kwargs): # real signature unknown \"\"\" Implement iter(self). \"\"\" pass def __len__(self, *args, **kwargs): # real signature unknown \"\"\" Return len(self). \"\"\" pass def __le__(self, *args, **kwargs): # real signature unknown \"\"\" Return self<=value. \"\"\" pass def __lt__(self, *args, **kwargs): # real signature unknown \"\"\" Return selfsize of D in memory, in bytes \"\"\" pass __hash__ = None
三.所有字典数据类型举例
user_info = { 0 :\"zhangyanlin\", \"age\" :\"18\", 2 :\"pythoner\" } #获取所有的key print(user_info.keys()) #获取所有的values print(user_info.values()) #获取所有的key和values print(user_info.items()) clear清除所有的内容 user_info.clear() print(user_info) #get 根据key获取值,如果key不存在,可以指定一个默认值 val = user_info.get(\'age\') print(val) #update批量更新 test = { \'a\':111, \'b\':222 } user_info.update(test) print(user_info)
四.索引
#如果没有key,会报错 user_info = { \"name\" :\'zhangyanlin\', \"age\" :18, \"job\" :\'pythoner\' } print(user_info[\'name\'])
五.for循环
#循环 user_info = { 0 :\"zhangyanlin\", \"age\" :\"18\", 2 :\"pythoner\" } for i in user_info: print(i) #循环输出所有的键入值 for k,v in user_info.items(): print(k) print(v)
以上就是本文的全部内容了,希望对大家熟练掌握Python数据结构能够有所帮助。