function scope of Python adorner

1. Function Scope LEGB

l:local function Internal Scope

e:enclosing function inside and inline function

G:global Global scope

B:build-in built-in scopes

Passline = 60deffunc (val): Passline= 90ifVal >=Passline:Print('Pass')    Else:        Print('failed')    defIn_func ()Print(val) in_func ()defMax (val1,val2):returnMax (Val1,val2) func (89)Print(Max (90,100))

2. Closure understanding and use

Closure concept: Closure: An intrinsic function that references a variable in a enclosing scope

function Essence and property

1: function is an object

2: Internal variable recycling after function execution completes

3: Function Properties

4: function return value

Closure function

1: Package

2: Code Reuse

Passline = 60# -deffunc (val):Print('%x'%ID (val)) Passline= 90ifVal >=Passline:Print('Pass')    Else:        Print('failed')    defIn_func ():#(Val,)        Print(val) in_func ()returnIN_FUNCF= Func (89) F ()Print(F.__closure__)

29198a8failed8989(<cell at 0x7fe62bbf42f0:int Object @ 0x29198a8> in 0.0S]

deffunc_150 (val): Passline= 90ifVal >=Passline:Print('%d pass'%val)Else:        Print('failed')    deffunc_100 (val): Passline= 60ifVal >=Passline:Print('%d pass'%val)Else:        Print('failed')defSet_passline (passline):defCMP (val):ifVal >=Passline:Print('Pass')        Else:            Print('failed')    returncmpf_100= Set_passline (60) f_150= Set_passline (90)Print(Type (f_100))Print(f_100.__closure__) f_100 (89) f_100 (59) f_150 (89) f_150 (59)

Pass in 0.0s]

defMy_averge (*Arg):Print('In My_averge')    returnSUM (ARG)/Len (ARG)defMy_sum (*Arg):Print('In my_sum')    returnsum (ARG)defDec (func):defIn_dec (*Arg):Print('In dec arg =', Arg)ifLen (arg) = =0:return0 forValinchARG:if  notisinstance (val, int):return0returnFunc (*Arg)returnIn_dec#Dec return in_dec-My_sum#my_sum = In_dec (*arg)My_sum =Dec (my_sum)Print(My_sum (1, 2, 3, 4, 5))Print(My_sum (1, 2, 3, 4, 5,'6'))Print(My_averge (1, 2, 3, 4, 5)) My_averge=Dec (my_averge)Print(My_averge (1, 2, 3, 4, 5,'6'))

('In dec arg =', (1, 2, 3, 4, 5))inchMy_sum15('In dec arg =', (1, 2, 3, 4, 5,'6')) 0inchMy_averge3('In dec arg =', (1, 2, 3, 4, 5,'6')) 0[finishedinch0.0S]

3. Decorative Device

1: Decorator for decorating functions

2: Returns a Function object

3: The decorated function identifier points to the returned function object

4: Grammar Sugar @deco

defDec (func):Print('Call Dec')    defIn_dec (*arg):#My_sum        Print('In dec arg =', Arg)ifLen (arg) = =0:return0 forValinchARG:if  notisinstance (val, int):return0returnFunc (*Arg)returnIn_dec@decdefMy_sum (*arg):#my_sum = In_dec    Print('In my_sum')    returnsum (ARG)Print(My_sum (1, 2, 3, 4, 5))#my_sum = Dec (my_sum) #Deco (BAR)-In_deco#bar = In_deco#Bar () In_deco () bar ()defDeco (func):defIn_deco (x, y):Print('In deco') func (x, y)Print('Call Deco')    returnIn_deco@decodefBar (x, y):Print('In bar', x+y)Print(Type (bar)) Bar ()

Call Dec (", (1, 2, 3, 4, 5)) inch my_sumcalldeco'function'> in  deco (  'inbar', 3 in 0.0s]

Python adorner function scope