607的彩的正确网址

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全局变量报错:UnboundLocalError: local variable ‘l’ referenced before assignment

2020年02月14日 云计算 ⁄ 共 1460字 ⁄ 字号 评论关闭

  zaichengxuzhongshezhide sum shuyuquanjubianliang,erzaihanshuzhongmeiyou sum dedingyi,genjupythonfangwenjububianlianghequanjubianliangdeguize:dangsousuoyigebianliangdeshihou,pythonxiancongjubuzuoyongyukaishisousuo,ruguozaijubuzuoyongyumeiyouzhaodaoneigebianliang,neiyangpythonjiuzaiquanjubianliangzhongzhaozheigebianliang,ruguozhaobudaopaochuyichang(nameerrorhuozheunbound-localerror,zheiqujueyupythonbanben。)

  ruguoneibuhanshuyouyinyongwaibuhanshudetongmingbianlianghuozhequanjubianliang,bingqieduizheigebianliangyouxiugai.neimepythonhuirenweitashiyigejububianliang,youyinweihanshuzhongmeiyousumdedingyihefuzhi,suoyibaocuo。

  congxiamianlianggechengxukandandudefangwenhuozhexiugaiquanjubianliang,bingbubaocuo~

  访问全局变量:

607的彩的正确网址  #!/usr/bin/python

607的彩的正确网址  # -*- coding: utf-8 -*-

  import sys

  sum=5

  def add(a=1,b=3):

  print a,b

  print sum #jinjinfangwen

  add(4,8)

607的彩的正确网址  print sum

  shuchujieguowei:

  4 8

  5

  5

607的彩的正确网址  xiugaitongmingdequanjubianliang,zerenweishiyigejububianliang:

  #!/usr/bin/python

  # -*- coding: utf-8 -*-

607的彩的正确网址  import sys

  sum=5

607的彩的正确网址  def add(a=1,b=3):

607的彩的正确网址  print a,b

  #neibuhanshuyouyinyongwaibuhanshudetongmingbianlianghuozhequanjubianliang,bingqieduizheigebianliangyouxiugai.neimepythonhuirenweitashiyigejububianliang

607的彩的正确网址  sum=b+a #zaihanshuneibuxiugai

  print sum

  add(4,8)

  shuchujieguowei:

  4 8

  12

  xiamiandechengxujiuhuiyinwei"ruguoneibuhanshuyouyinyongwaibuhanshudetongmingbianlianghuozhequanjubianliang,bingqieduizheigebianliangyouxiugai。neime python huirenweitashiyigejububianliang,youyinweihanshuzhongmeiyou sum dedingyihefuzhi,suoyibaocuo:

  #!/usr/bin/python

  # -*- coding: utf-8 -*-

607的彩的正确网址  import sys

  sum=5

  def add(a=1,b=3):

  print a,b

  print sum #neibuhanshuyinyongtongmingbianliang,bingqiexiugaizheigebianliang。pythonhuirenweitashijububianliang。yinweizaicichuprintzhiqian,meiyoudingyisumbianliang,suoyihuibaocuo(jianyiyuqingkuangyibijiao,beizhu:cichuzhishibishanglixianprint sum)

  sum=b+a

607的彩的正确网址  print sum

  add(4,8)

  print sum

  baocuoxinxi:

  4 8

607的彩的正确网址  traceback (most recent call last):

  ...

  ...

  ...

  unboundlocalerror: local variable 'sum' referenced before assignment

  yudaozaichengxuzhongfangwenquanjubianliangbingqieyaoxiugaiquanjubianliangdezhideqingkuangkeyishiyong:global guanjianzi,zaihanshuzhongshengmingcibianliangshiquanjubianliang。

  #!/usr/bin/python

  # -*- coding: utf-8 -*-

  import sys

  sum=5

607的彩的正确网址  print 'gaibianzhiqian:sum=',sum

  def add(a=1,b=3):

607的彩的正确网址  global sum

  print 'add hanshuzhong:sum=',sum

  sum=b+a

607的彩的正确网址  print 'hanshuzhonggaibianzhihou:sum= ',sum

  add(4,8)

607的彩的正确网址  print 'gaibianzhihou sum=',sum

  shuchujieguowei:

  gaibianzhiqian:sum= 5

607的彩的正确网址  add hanshuzhong:sum= 5

607的彩的正确网址  hanshuzhonggaibianzhihou:sum= 12

  gaibianzhihou sum= 12

  yishangjiushiquanjubianliangbaocuodexiangguanjieshao,ruguoniyougenghaodejiejuefangfahuozhexianglejiegengduozhishi,qingguanzhuxuebuyuan。

baoqian!pinglunyiguanbi.

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