python dict类型_Python数据类型详解（四）字典：dict

爱被打了一巴掌 2022-10-31 13:44 332阅读 0赞

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 self

pass

@staticmethod \# known case of \_\_new\_\_

def \_\_new\_\_(\*args, \*\*kwargs): \# real signature unknown

""" Create and return a new object. See help(type) for accurate signature. """

pass

def \_\_ne\_\_(self, \*args, \*\*kwargs): \# real signature unknown

""" Return self!=value. """

pass

def \_\_repr\_\_(self, \*args, \*\*kwargs): \# real signature unknown

""" Return repr(self). """

pass

def \_\_setitem\_\_(self, \*args, \*\*kwargs): \# real signature unknown

""" Set self\[key\] to value. """

pass

def \_\_sizeof\_\_(self): \# real signature unknown; restored from \_\_doc\_\_

""" D.\_\_sizeof\_\_() -> 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。

python dict类型_Python数据类型详解（四）字典：dict

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