Python成长之路第二篇（3）_字典的
发布时间：2019-07-25 09:16:14编辑：auto阅读（1635）
字典的置函数用法（字典dict字典中的key不可以重复）
"""
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)
"""
（1）def clear(self): 清除内容
# real signature unknown; restored from __doc__
""" 清除内容 """
""" D.clear() -> None. Remove all items from D. """
pass
（2）def copy(self): 浅拷贝
# real signature unknown; restored from __doc__
""" 浅拷贝 """
""" D.copy() -> a shallow copy of D """
pass
@staticmethod # known case
def fromkeys(S, v=None): # real signature unknown; restored from __doc__
"""
dict.fromkeys(S[,v]) -> New dict with keys from S and values equal to v.
v defaults to None.
"""
pass
深Copy
（3）def get(self, k, d=None): 根据key获取值
# real signature unknown; restored from __doc__
""" D.get(k[,d]) -> D[k] if k in D, else d. d defaults to None. """
Pass
（4）def fromkeys(S, v=None): 读取列表生成字典
# real signature unknown; restored from __doc__
"""
dict.fromkeys(S[,v]) -> New dict with keys from S and values equal to v.
v defaults to None.
"""（5）def has_key(self, k): 是否有这个key
# real signature unknown; restored from __doc__
""" D.has_key(k) -> True if D has a key k, else False """
return False
（6）def items(self):转换成列表
# real signature unknown; restored from __doc__
""" 所有项的列表形式 """
""" D.items() -> list of D's (key, value) pairs, as 2-tuples """
return []
列表循环
（7）def iteritems(self):迭代
# real signature unknown; restored from __doc__
""" 项可迭代 """
""" D.iteritems() -> an iterator over the (key, value) items of D """
pass
（8）def iterkeys(self): key可迭代
# real signature unknown; restored from __doc__
""" D.iterkeys() -> an iterator over the keys of D """
pass
（9）def itervalues(self): value可迭代
# real signature unknown; restored from __doc__
""" value可迭代 """
""" D.itervalues() -> an iterator over the values of D """
pass
（10）def keys(self):显示所有的key列表
# real signature unknown; restored from __doc__
""" 所有的key列表 """
""" D.keys() -> list of D's keys """
return []
（11）def pop(self, k, d=None): 获取并在字典中移除
# real signature unknown; restored from __doc__
""" 获取并在字典中移除 """
"""
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
（12）def popitem(self):按照内存顺序删除
# real signature unknown; restored from __doc__
""" 获取并在字典中移除 """
"""
D.popitem() -> (k, v), remove and return some (key, value) pair as a
2-tuple; but raise KeyError if D is empty.
"""
pass
（13）def setdefault(self, k, d=None): 如果key不存在，则创建，如果存在，则返回已存在的值且不修改
# real signature unknown; restored from __doc__
""" 如果key不存在，则创建，如果存在，则返回已存在的值且不修改 """
""" D.setdefault(k[,d]) -> D.get(k,d), also set D[k]=d if k not in D """
pass
（14）def update(self, E=None, **F):整合字典C字典更新d字典
# known special case of dict.update
""" 更新
{'name':'alex', 'age': 18000}
[('name','sbsbsb'),]
"""
"""
D.update([E, ]**F) -> None. Update D from dict/iterable E and F.
If E present and has a .keys() method, does: for k in E: D[k] = E[k]
If E present and lacks .keys() method, 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
（15）def values(self): 打印所有的val
# real signature unknown; restored from __doc__
""" 所有的值 """
""" D.values() -> list of D's values """
return []
（16）def viewitems(self): 查看所有项，只是将内容保存至view对象中
# real signature unknown; restored from __doc__
""" D.viewitems() -> a set-like object providing a view on D's items """
Pass
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