Python inline functions

Local Variables

def discount (price, rate):

Final_price = Price * Rate

Return Final_price

Old_price = float (Input (' Enter Price: ')) global variable

Rate = Float (input (' Please enter discount ratio: '))

New_price = Discount (old_price, rate)

Print (' Price after Discount: ', New_price)

Print (the value of ' Print local variable final_price: ',final_price) is shown as a defined variable, Final_price is a variable in the discount function, is a local variable, and the discount is invalid.

Defining global variables in local variables

>>> test1 = 5

>>> def Change ():

Test1 = 10

Print (test1)

>>> Change ()

10

>>> test1

5

>>> def Change ():

Global Test1

Test1 = 10

Print (test1)

>>> Change ()

10

>>> test1

10

inline functions

>>> def fun1 ():

Print (' fun1 is being called: ')

Def fun2 ():

Print (' fun2 is being called ... ')

Fun2 ()

>>> fun1 () call FUN1 () to execute call FUN2 ()

FUN1 is being called:

Fun2 is being called ...

closures If in an intrinsic function, a reference to a variable in the outer scope

>>> def fun3 (x):

def fun4 (y):

return x * y

Return FUN4

>>> Fun3 (1)

<function Fun3.<locals>.fun4 at 0x0000000002f549d8>

>>> type (FUN3)

<class ' function ' >

>>> fun3 (1) (2)

2

>>> def fun1 ():

x = 5

Def fun2 ():

X *= x

return x

Return fun2 ()

>>> fun1 ()

Traceback (most recent):

File "<pyshell#52>", line 1, in <module>

FUN1 ()

File "<pyshell#50>", line 6, in FUN1

Return fun2 ()

File "<pyshell#50>", line 4, in fun2

X *= x

unboundlocalerror:local variable ' x ' referenced before assignment

>>> def fun1 ():

x = 5

Def fun2 ():

nonlocal x Force Declaration of non-local variables

X *= x

return x

Return fun2 ()

>>> fun1 ()

25

Python inline functions