# __rmul__()
# 左右兩個物件比較並做乘法
class
foo:
def__init__
(self, val)
: self.val = val
def__rmul__
(self, other)
:return foo(self.val * other.val)
def__str__
(self)
:return
'foo [% s]'
% self.val
class
bar:
def__init__
(self, val)
: self.val = val
def__rmul__
(self, other)
:return foo(self.val * other.val)
def__str__
(self)
:return
'bar [% s]'
% self.val
f = foo(3)
b = bar(4)
print
(f * b)
f = foo(3)
b = bar(
'abc'
)print
(f * b)
print
(b * f)
# __dict__() 例項屬性管理
class
anotherfun
:def
__init__
(self)
: self.name =
'yorlen'
print
(self.__dict__)
self.age =
24print
(self.__dict__)
self.male =
true
print
(self.__dict__)
af = anotherfun(
)# __setattr__()屬性註冊
# 重寫__setattr__方便使用者提供簡單資料
# 從而對物件的初始化做相對改變
# 如果重寫__setattr__()但什麼都不做
# 那麼物件將沒有任何屬性
class
fun:
def__init__
(self)
: self.name =
'yorlen'
self.age =
24 self.male =
true
def__setattr__
(self, key, value)
:print
('-----------------'
)print
('setting:{},with:{}'
.format
(key, value)
)print
('current __dict__:{}'
.format
(self.__dict__)
)# 屬性註冊
self.__dict__[key]
= value
print
('current __dict__:{}'
.format
(self.__dict__)
)def
print_hello
(self)
:print
('hello,{}'
.format
(self.name)
)fun = fun(
)print
(fun)
print
(fun.__dict__)
# __sizeof__()顯示物件的記憶體占用長度
# 類物件的記憶體占用長度為32
print
(fun.__sizeof__())
print
(af.__sizeof__())
print
(f.__sizeof__())
print
(b.__sizeof__())
# __slots__控制物件屬性
# 不能像任意類一樣可以隨意新增屬性
# 在__slots__內定義了哪些屬性
class
test_slots
: __slots__ =
'x',
'y'def
__init__
(self)
: self.x =
22# self.z = 44
defsay
(self)
:print
("i'm {}"
.format
(self.x)
)sl = test_slots(
)print
(sl.x)
try:
print
(sl.y)
except attributeerror as reason:
print
(reason)
sl.y =
33print
(sl.y)
sl.x =
44print
(sl.x)
# sl.z = 55 報錯
# print(sl.z)
class
test_n
:def
__init__
(self)
: self.x =
22 self.y =
33# self.z = 44
defsay
(self)
:print
("i'm {}"
.format
(self.x)
)sl1 = test_n(
)print
(sl1.x)
print
(sl1.y)
sl1.x =
44print
(sl1.x)
sl1.z =
55print
(sl1.z)
c:\users\administrator\pycharmprojects\pythonproject\venv\scripts\python.exe d:/codefile/pass/pythonneizhifunctonsix.py
foo [12]
foo [abcabcabc]
foo [abcabcabc]
-----------------
setting:name,with:yorlen
current __dict__:{}
current __dict__:
-----------------
setting:age,with:24
current __dict__:
current __dict__:
-----------------
setting:male,with:true
current __dict__:
current __dict__:
<__main__.fun object at 0x0000000001e2a400>
3232
323222y
3344
2233
4455
process finished with exit code 0
python之內置函式
非空即真，非0即真 記住這句話可以讓你少寫好多 l asdfgwert3r 1 sorted l 排序 字串可以直接使用sorted排序 2 all 如果list裡面都為真的情況返回為 true all 1 2,3 4 print true all 1 2,3 0 print false all 1...
python之內置函式
它將兩個 非複數 數字作為實參，並在執行整數除法時返回一對商和餘數。對於混合運算元型別，適用雙目算術運算子的規則。對於整數，結果和 a b,a b 一致，分別對應取整數和取餘數 對於浮點數，結果是 q,a b q 通常是 math.floor a b 但可能會比 1 小。如 將153拆解 a,b d...
python 之內置模組
裝飾器 def trace func result func args,kwargs print s r,r r func.name args,kwargs,result return result trace 裝飾器含義就是 fibonacci trace fibonacci def fibona...