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      def foo():
print('function')
foo()
     ÔÚÉÏÊö´úÂëÖУ¬¶¨ÒåÁËÒ»¸öÃûΪfooµÄº¯Êý£¬Õâ¸öº¯ÊýûÓвÎÊý¡£×îºóÒ»ÐдúÂëµÄ¹¦ÄÜÊǵ÷ÓÃÕâ¸öº¯Êý¡£ÕâÊÇÒ»¸öº¯ÊýµÄ×î¼òµ¥ÐÎʽ¡£ÏÂÃæÀ´½éÉÜÒ»ÏÂÓвÎÊýµÄº¯Êý£º
      def foo():
print('function')
def foo1(a,b):
print(a+b)
foo()
foo1(1,2)
     foo1¾ÍÊÇÒ»¸öÓвÎÊýµÄº¯Êý£¬Ê¹ÓÃfoo1(1,2)¾Í¿ÉÒÔµ÷ÓÃÕâ¸öÓвεĺ¯ÊýÁË¡£
     ÔÚ³ÌÐòÖУ¬ÓбäÁ¿´æÔÚ£¬¾Í»áÉæ¼°µ½±äÁ¿µÄ×÷ÓÃÓòµÄÎÊÌâ¡£ÔÚPythonÖУ¬±äÁ¿µÄ×÷ÓÃÓò·ÖÈý¸öµÈ¼¶£ºglobal¡¢localºÍnonlocal¡£
global£º¹ËÃû˼Ò壬±íʾȫ¾Ö±äÁ¿¡£¼´Õâ¸ö±äÁ¿ÔÚpythonÖд¦ÓÚ×î¸ß²ã´ÎÉÏ£¬Ò²¾ÍÊÇÕâ¸ö±äÁ¿µÄ¶¨Òå²ã´Î×î¸ß£¬¶ø²»ÊÇÔÚº¯Êý»òÀàÖС£
local£º¾Ö²¿±äÁ¿£¬±»¶¨ÒåÔÚº¯ÊýÖ®ÖС£
nonlocal£ºÕâÊÇÒ»¸öÏà¶ÔµÄ¸ÅÄî¡£ÔÚpythonÖУ¬º¯ÊýÄÚ²¿¿ÉÒÔǶÌ×¶¨ÒåÄÚ²¿º¯Êý£¬ÕâÑùº¯ÊýÄÚ²¿µÄ±äÁ¿Ïà¶ÔÓÚº¯ÊýÄÚ²¿µÄÄÚǶº¯ÊýÀ´½²¾ÍÊÇnonlocalµÄ¡£
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      x = 1
y = 2
def foo(x):
print(x)
print(y)
print('***********')
x = 3
global y
y = 3
print(x)
print(y)
print('***********')
foo(x)
print(x)
print(y)
#************************
#ÔËÐнá¹û
1
2
***********
3
3
***********
1
3
     ÔÚÉÏÊö³ÌÐòÖУ¬¶¨ÒåÁËÁ½¸öÈ«¾Ö±äÁ¿xºÍy£¬ ÔÚº¯ÊýfooÄÚ²¿£¬Ò²¶¨ÒåÁËÒ»¸ö¾Ö²¿±äÁ¿x¡£¸ù¾ÝÔËÐнá¹û¿ÉÖª£¬ÔÚfooÄÚ²¿£¬±äÁ¿xÊÇÕæÕýµÄ¾Ö²¿±äÁ¿¡£ÒòΪ¶ÔÆäËù×öµÄÐ޸IJ¢Ã»ÓжÔÈ«¾Ö±äÁ¿x²úÉúÓ°Ïì¡£ÁíÍ⣬Èç¹ûÔÚfooÄÚ²¿ÐèҪʹÓÃÈ«¾Ö±äÁ¿£¬ÔòÐèҪʹÓÃglobal¹Ø¼ü×Ö¡£global yµÄÒâͼ¾ÍÊÇÉùÃ÷±äÁ¿yΪÍⲿÉùÃ÷¹ýµÄÈ«¾Ö±äÁ¿y¡£ËùÒÔ£¬ÔÚfooÄÚ²¿¶Ôy½øÐÐÐ޸ĺó£¬ÔÚfooÍⲿÈÔÈ»ÓÐÓ°Ïì¡£ÒòΪfooÐ޸ĵÄÊÇÈ«¾Ö±äÁ¿¡£
     ÔÙÀ´¿´Ò»ÏÂnonlocal£º
      def out():
z = 3
def inner():
nonlocal z
z = 4
print('inner function


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