Python之字典方法

def clear(self): # 清除所有内容
    """ D.clear() -> None.  Remove all items from D. """
    pass

def copy(self): # 浅复制
    """ D.copy() -> a shallow copy of D """

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): # 根据字典的key获取值，如果key不存在，返回None。
    """ D.get(k[,d]) -> D[k] if k in D, else d.  d defaults to None. """
    pass

def items(self): # 获取字典所有的键值对
    """ D.items() -> a set-like object providing a view on D's items """
    pass
example：
　　dic = {

    1: 'abc',
    2: 'def',
    3: 'hjk'
}

for k,v in dic.items():
    print(k,v)　　

　　1 abc    #返回结果
　　2 def
　　3 hjk

def keys(self): # 获取字典所有的key
    """ D.keys() -> a set-like object providing a view on D's keys """
    pass

def pop(self, k, d=None): # 获取并在字典中移除，可指定移除。
    """
    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): # 获取并在字典中移除，只能从尾部移除。
    """
    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): # 批量更新
    """
    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]
    """
example：
　　dic = {

    1: 'abc',
    2: 'def',
    3: 'hjk'
　　}

　　test = {
    4: 'lmn',
    5: 'opq'
　　}
　　dic.update(test)
　　print(dic)

　　　　{1: 'abc', 2: 'def', 3: 'hjk', 4: 'lmn', 5: 'opq'}  #返回结果

def values(self): # 获取字典所有的值
    """ D.values() -> an object providing a view on D's values """
    pass