后端开发|Python教程
Python数据类型,字典,dict
后端开发-Python教程
一.基本数据类型
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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
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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。
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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 objects (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 Ds items """ pass def keys(self): # real signature unknown; restored from __doc__ """ D.keys() -> a set-like object providing a view on Ds 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 Ds 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 objects(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 pairsin 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 self size 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keyprint(user_info.keys()) #获取所有的valuesprint(user_info.values()) #获取所有的key和valuesprint(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, :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[ ame])
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。
