補(bǔ)充

pipreqs：

- 項(xiàng)目依賴 pip3 install pipreqs
- 生成依賴文件：pipreqs ./ 
- 安裝依賴文件：pip3 install -r requirements.txt 

函數(shù)和方法

from types import MethodType,FunctionType

class Foo(object):
    def fetch(self):
        pass

print(isinstance(Foo.fetch,MethodType))
print(isinstance(Foo.fetch,FunctionType)) # True

obj = Foo()
print(isinstance(obj.fetch,MethodType)) # True
print(isinstance(obj.fetch,FunctionType))

threading.local

多個(gè)線程修改同一個(gè)數(shù)據(jù)，復(fù)制多份變量給每個(gè)線程用,為每個(gè)線程開辟一塊空間進(jìn)行數(shù)據(jù)存儲

不用threading.local

# 不用local
from threading import Thread
import time
lqz = -1
def task(arg):
    global lqz
    lqz = arg
    # time.sleep(2)
    print(lqz)

for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

threading.local使用

from threading import Thread
from threading import local
import time
from threading import get_ident
# 特殊的對象
lqz = local()
def task(arg):
    # 對象.val = 1/2/3/4/5
    lqz.value = arg
    time.sleep(2)
    print(lqz.value)
for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

通過字典自定義threading.local（函數(shù)）

from threading import get_ident,Thread
import time
storage = {}
def set(k,v):
    ident = get_ident()
    if ident in storage:
        storage[ident][k] = v
    else:
        storage[ident] = {k:v}
def get(k):
    ident = get_ident()
    return storage[ident][k]
def task(arg):
    set('val',arg)
    v = get('val')
    print(v)

for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

面向?qū)ο蟀?/h3>

from threading import get_ident,Thread
import time
class Local(object):
    storage = {}
    def set(self, k, v):
        ident = get_ident()
        if ident in Local.storage:
            Local.storage[ident][k] = v
        else:
            Local.storage[ident] = {k: v}
    def get(self, k):
        ident = get_ident()
        return Local.storage[ident][k]
obj = Local()
def task(arg):
    obj.set('val',arg) 
    v = obj.get('val')
    print(v)
for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

通過setattr和getattr實(shí)現(xiàn)

from threading import get_ident,Thread
import time
class Local(object):
    storage = {}
    def __setattr__(self, k, v):
        ident = get_ident()
        if ident in Local.storage:
            Local.storage[ident][k] = v
        else:
            Local.storage[ident] = {k: v}
    def __getattr__(self, k):
        ident = get_ident()
        return Local.storage[ident][k]
obj = Local()
def task(arg):
    obj.val = arg
    print(obj.val)
for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

每個(gè)對象有自己的存儲空間（字典）

from threading import get_ident,Thread
import time
class Local(object):
    def __init__(self):
        object.__setattr__(self,'storage',{})
    def __setattr__(self, k, v):
        ident = get_ident()
        if ident in self.storage:
            self.storage[ident][k] = v
        else:
            self.storage[ident] = {k: v}
    def __getattr__(self, k):
        ident = get_ident()
        return self.storage[ident][k]
obj = Local()
def task(arg):
    obj.val = arg
    obj.xxx = arg
    print(obj.val)
for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

兼容線程和協(xié)程

try:
    from greenlet import getcurrent as get_ident
except Exception as e:
    from threading import get_ident
from threading import Thread
import time
class Local(object):
    def __init__(self):
        object.__setattr__(self,'storage',{})
    def __setattr__(self, k, v):
        ident = get_ident()
        if ident in self.storage:
            self.storage[ident][k] = v
        else:
            self.storage[ident] = {k: v}
    def __getattr__(self, k):
        ident = get_ident()
        return self.storage[ident][k]
obj = Local()
def task(arg):
    obj.val = arg
    obj.xxx = arg
    print(obj.val)
for i in range(10):
    t = Thread(target=task,args=(i,))
    t.start()

partial偏函數(shù)

#偏函數(shù)的第二個(gè)部分(可變參數(shù))，按原有函數(shù)的參數(shù)順序進(jìn)行補(bǔ)充，參數(shù)將作用在原函數(shù)上，最后偏函數(shù)返回一個(gè)新函數(shù)
from functools import partial
def test(a,b,c,d):
    return a+b+c+d

tes=partial(test,1,2)
print(tes(3,4))

session源碼分析

SecureCookieSessionInterface
    -open_session
    -save_session