What is the namespace and scope of Python functions

This article mainly introduces what is the namespace and scope of Python functions. It is very detailed and has a certain reference value. Friends who are interested must finish it!

1.Local scope a = 100def func5 (): B = 50 a = 99 print ('within the function, a) print (' within the function, b) print ('outside the function, a) func5 () print (' outside the function, b)

Return the result:

Outside the function a 100

Within the function a 99

Within the function b 50

Traceback (most recent call last):

File "C:/Users/Administrator/Desktop/python knowledge Summary / 2.python self-study Network-General Module-Video Source Code / test.py", line 12, in

Print ('outside the function, b)

NameError: name 'b'is not defined

The b variable is defined in the above function, so it cannot be output outside.

2.Enclosing function locals scope a = 100def func5 (): B = 50 print ('intra-function, a) print (' intra-function, b) def func6 (): print ('lower-level function, a) print (' lower-level function, b) func6 () func5 ()

Return the result:

A 100 within the function

Within the function b 50

Within the lower level function a 100

Within the lower level function b 50

3.Global global variable a = 123def func (): a = 100print (a) print (a) func (a) print (a) print (a) = 123def func (): global a # cannot use nonlocal a = 100print (a) print (locals ()) # View the local variable print (globals ()) # look at the global variable print (a) func () print (a) 4. The nonlocal variable nonlocaldef func5 (): B = 50 print (b) def func6 (): nonlocal b # is nonlocal and only applies to the interior of the closure b = 60 print (b) func6 () print (b) func5 () 5. The nearest principle b = 1111def func5 (): B = 50 print (b) def func6 (): B = 60 print (b) # where b finds func6 () print (b) func5 () a = 100def func5 (): B = 50 print (a) print (b) def func6 (): B = 60 print (b) print (a) func5 () 6. Function execution order a = 123def func1 (): print (a) print (b) func1 () # cannot print bb = 456func1 () # can print b7. If True: a = 100print (a) for i in range (1,10): print (I) print (I)

There is no scope in the loop code block.

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