*hi all,*
*我这里有个代码,*
*#!/usr/bin/python*
*def func(x):*
 *print 'x is', x*
* x = 2*
* print 'Changed local x to', x*
** 
*x = 50*
*func(x)*
*print 'x is still', x*
** 
*为什么输出会是*
x is 50
Changed local x to 2
x is still 50
为什么第一个x is 50用的会是function外的x = 50呢？
而非x = 2？
 请教!多谢！
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变量的作用域问题……
函数里外的x不一样，当然出现这种情况了。

On 8/23/05, Deslay <deslay at gmail.com> wrote:
> 
> *hi all,*
> *我这里有个代码,*
> *#!/usr/bin/python*
> *def func(x):*
>  *print 'x is', x*
> * x = 2*
> * print 'Changed local x to', x*
> ** 
> *x = 50*
> *func(x)*
> *print 'x is still', x*
> ** 
> *为什么输出会是*
> x is 50
> Changed local x to 2
> x is still 50
> 为什么第一个x is 50用的会是function外的x = 50呢？
> 而非x = 2？
>  请教!多谢！
>   
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese
> 
> 
> 


-- 
#############################################
# "your future depends on your dreams." so go to sleep.
# save water. shower with your girlfriend.
#
# Welcom2 : http//blog.csdn.net/auding1900/
#############################################
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在 05-8-23，Deslay<deslay at gmail.com> 写道：
> hi all, 
> 我这里有个代码, 
> #!/usr/bin/python 
> def func(x): 
>   print 'x is', x 
>   x = 2 
>   print  'Changed local x to', x 
>   
> x = 50 
> func(x) 
> print 'x is still', x 
>   
> 为什么输出会是 
> x is 50
> Changed local x to 2
> x is still 50 
> 为什么第一个x is 50用的会是function外的x = 50呢？ 
> 而非x = 2？ 
>   
> 请教!多谢！ 
>   

Python中的参数是值参，而不是变参。因此在函数中的对参数的修改，并不影响外面的原值。

-- 
I like python! 
My Donews Blog: http://www.donews.net/limodou

多谢各位.
  missv   <lj0508 at gmail.com> to python-chinese
 More options 7:38 pm (1½ hours ago) > def func(x):
> print 'x is', x #这个x是函数参数x,值为50
> x = 2 #这个x是函数内的x,作用域从这一句开始,并覆盖参数x
> print 'Changed local x to', x
这个我想我看明白了的.

 On 8/23/05, limodou <limodou at gmail.com> wrote: 
> 
> 在 05-8-23，Deslay<deslay at gmail.com> 写道：
> > hi all,
> > 我这里有个代码,
> > #!/usr/bin/python
> > def func(x):
> > print 'x is', x
> > x = 2
> > print 'Changed local x to', x
> >
> > x = 50
> > func(x)
> > print 'x is still', x
> >
> > 为什么输出会是
> > x is 50
> > Changed local x to 2
> > x is still 50
> > 为什么第一个x is 50用的会是function外的x = 50呢？
> > 而非x = 2？
> >
> > 请教!多谢！
> >
> 
> Python中的参数是值参，而不是变参。因此在函数中的对参数的修改，并不影响外面的原值。
> 
> --
> I like python!
> My Donews Blog: http://www.donews.net/limodou
> 
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese
> 
> 
> 


-- 
----------------------------------------------
Name: Hugh Rex
Blog: http://www.hughr.org/
Location: Huizhou CHINA
Matrix: MESS WITH THE BESS DIE LIKE THE REST
----------------------------------------------
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使用global语句，告诉Python这个变量名不是局部的，而是全局的。
def func(x):
	global x
	print 'x is', x
	x = 2
	print  'Changed local x to', x

x=50
func()
print 'x is still', x

x is 50
Changed local x to 2
x is still 2


2005/8/23, Deslay <deslay at gmail.com>:
> 多谢各位.
> missv  
> <lj0508 at gmail.com> to python-chinese More options   7:38 pm (1½ hours ago)
> > def func(x):
> >   print 'x is', x #这个x是函数参数x,值为50
> >   x = 2           #这个x是函数内的x,作用域从这一句开始,并覆盖参数x
> >   print  'Changed local x to', x这个我想我看明白了的.
> 
>  
> On 8/23/05, limodou <limodou at gmail.com> wrote: 
> > 
> > 在 05-8-23，Deslay<deslay at gmail.com> 写道：
> > > hi all,
> > > 我这里有个代码, 
> > > #!/usr/bin/python
> > > def func(x):
> > >   print 'x is', x
> > >   x = 2
> > >   print  'Changed local x to', x
> > >
> > > x = 50
> > > func(x)
> > > print 'x is still', x
> > >
> > > 为什么输出会是 
> > > x is 50
> > > Changed local x to 2
> > > x is still 50
> > > 为什么第一个x is 50用的会是function外的x = 50呢？
> > > 而非x = 2？
> > >
> > > 请教!多谢！
> > >
> > 
> > Python中的参数是值参，而不是变参。因此在函数中的对参数的修改，并不影响外面的原值。
> > 
> > -- 
> > I like python!
> > My Donews Blog: http://www.donews.net/limodou
> > 
> > _______________________________________________
> > python-chinese list
> > python-chinese at lists.python.cn
> > http://python.cn/mailman/listinfo/python-chinese
> > 
> > 
> > 
> 
> 
> 
> -- 
> ---------------------------------------------- 
> Name: Hugh Rex
> Blog: http://www.hughr.org/
> Location: Huizhou CHINA
> Matrix: MESS WITH THE BESS DIE LIKE THE REST
> ---------------------------------------------- 
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese
> 
> 
>

阁下的Python什么版本？我的2.4，编译通不过，global不能这么用

On 8/24/05, D Shi Ming <dushmo at gmail.com> wrote:
> 
> 使用global语句，告诉Python这个变量名不是局部的，而是全局的。
> def func(x):
> global x
> print 'x is', x
> x = 2
> print 'Changed local x to', x
> 
> x=50
> func()
> print 'x is still', x
> 
> x is 50
> Changed local x to 2
> x is still 2
> 
> 
> 2005/8/23, Deslay <deslay at gmail.com>:
> > 多谢各位.
> > missv
> > <lj0508 at gmail.com> to python-chinese More options 7:38 pm (1½ hours ago)
> > > def func(x):
> > > print 'x is', x #这个x是函数参数x,值为50
> > > x = 2 #这个x是函数内的x,作用域从这一句开始,并覆盖参数x
> > > print 'Changed local x to', x这个我想我看明白了的.
> >
> >
> > On 8/23/05, limodou <limodou at gmail.com> wrote:
> > >
> > > 在 05-8-23，Deslay<deslay at gmail.com> 写道：
> > > > hi all,
> > > > 我这里有个代码,
> > > > #!/usr/bin/python
> > > > def func(x):
> > > > print 'x is', x
> > > > x = 2
> > > > print 'Changed local x to', x
> > > >
> > > > x = 50
> > > > func(x)
> > > > print 'x is still', x
> > > >
> > > > 为什么输出会是
> > > > x is 50
> > > > Changed local x to 2
> > > > x is still 50
> > > > 为什么第一个x is 50用的会是function外的x = 50呢？
> > > > 而非x = 2？
> > > >
> > > > 请教!多谢！
> > > >
> > >
> > > Python中的参数是值参，而不是变参。因此在函数中的对参数的修改，并不影响外面的原值。
> > >
> > > --
> > > I like python!
> > > My Donews Blog: http://www.donews.net/limodou
> > >
> > > _______________________________________________
> > > python-chinese list
> > > python-chinese at lists.python.cn
> > > http://python.cn/mailman/listinfo/python-chinese
> > >
> > >
> > >
> >
> >
> >
> > --
> > ----------------------------------------------
> > Name: Hugh Rex
> > Blog: http://www.hughr.org/
> > Location: Huizhou CHINA
> > Matrix: MESS WITH THE BESS DIE LIKE THE REST
> > ----------------------------------------------
> > _______________________________________________
> > python-chinese list
> > python-chinese at lists.python.cn
> > http://python.cn/mailman/listinfo/python-chinese
> >
> >
> >
> 
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese
> 
> 
> 


-- 
#############################################
# "your future depends on your dreams." so go to sleep.
# save water. shower with your girlfriend.
#
# Welcom2 : http//blog.csdn.net/auding1900/
#############################################
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我使用的是Python 2.4.1

2005/8/24, Spirit Auding <auding at gmail.com>:
> 阁下的Python什么版本？我的2.4，编译通不过，global不能这么用
> 
> 
> On 8/24/05, D Shi Ming <dushmo at gmail.com > wrote:
> > 使用global语句，告诉Python这个变量名不是局部的，而是全局的。
> > def func(x):
> >         global x 
> >         print 'x is', x
> >         x = 2
> >         print  'Changed local x to', x
> > 
> > x=50
> > func()
> > print 'x is still', x
> > 
> > x is 50
> > Changed local x to 2
> > x is still 2
> > 
> > 
> > 2005/8/23, Deslay < deslay at gmail.com>:
> > > 多谢各位.
> > > missv
> > > <lj0508 at gmail.com> to python-chinese More options   7:38 pm (1½ hours
> ago)
> > > > def func(x): 
> > > >   print 'x is', x #这个x是函数参数x,值为50
> > > >   x = 2           #这个x是函数内的x,作用域从这一句开始,并覆盖参数x
> > > >   print  'Changed local x to', x这个我想我看明白了的.
> > >
> > >
> > > On 8/23/05, limodou < limodou at gmail.com> wrote:
> > > >
> > > > 在 05-8-23，Deslay<deslay at gmail.com> 写道：
> > > > > hi all,
> > > > > 我这里有个代码,
> > > > > #!/usr/bin/python 
> > > > > def func(x):
> > > > >   print 'x is', x
> > > > >   x = 2
> > > > >   print  'Changed local x to', x
> > > > >
> > > > > x = 50
> > > > > func(x)
> > > > > print 'x is still', x 
> > > > >
> > > > > 为什么输出会是
> > > > > x is 50
> > > > > Changed local x to 2
> > > > > x is still 50
> > > > > 为什么第一个x is 50用的会是function外的x = 50呢？
> > > > > 而非x = 2？ 
> > > > >
> > > > > 请教!多谢！
> > > > >
> > > >
> > > > Python中的参数是值参，而不是变参。因此在函数中的对参数的修改，并不影响外面的原值。
> > > >
> > > > --
> > > > I like python!
> > > > My Donews Blog: http://www.donews.net/limodou
> > > >
> > > > _______________________________________________
> > > > python-chinese list
> > > > python-chinese at lists.python.cn 
> > > > http://python.cn/mailman/listinfo/python-chinese
> > > >
> > > >
> > > >
> > >
> > >
> > >
> > > --
> > > ---------------------------------------------- 
> > > Name: Hugh Rex
> > > Blog: http://www.hughr.org/
> > > Location: Huizhou CHINA
> > > Matrix: MESS WITH THE BESS DIE LIKE THE REST
> > > ---------------------------------------------- 
> > > _______________________________________________
> > > python-chinese list
> > > python-chinese at lists.python.cn
> > > http://python.cn/mailman/listinfo/python-chinese
> > >
> > >
> > >
> > 
> > _______________________________________________
> > python-chinese list
> > python-chinese at lists.python.cn 
> > http://python.cn/mailman/listinfo/python-chinese
> > 
> > 
> > 
> 
> 
> 
> -- 
> ############################################# 
> 
> #    "your future depends on your dreams." so go to sleep.
> #    save water. shower with your girlfriend.
> #
> #    Welcom2 : http//blog.csdn.net/auding1900/
> ############################################# 
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese
> 
> 
>

On 8/24/05, D Shi Ming <dushmo at gmail.com> wrote:
> 我使用的是Python 2.4.1
> 
> 2005/8/24, Spirit Auding <auding at gmail.com>:
> > 阁下的Python什么版本？我的2.4，编译通不过，global不能这么用
> >
> >
> > On 8/24/05, D Shi Ming <dushmo at gmail.com > wrote:
> > > 使用global语句，告诉Python这个变量名不是局部的，而是全局的。
> > > def func(x):
> > >         global x
> > >         print 'x is', x
> > >         x = 2
> > >         print  'Changed local x to', x
> > >
> > > x=50
> > > func()
> > > print 'x is still', x
> > >
> > > x is 50
> > > Changed local x to 2
> > > x is still 2
> > >
> > >


不对啊,  根据定义, x在声明为函数参数之后是不能用在global语句里的，2.4.1的版本也没有改变

Names listed in a global statement must not be defined as formal
parameters or in a for loop control target, class definition, function
definition, or import statement.
---- http://www.python.org/doc/2.4.1/ref/global.html#l2h-557

-- 
simple is good

程序运行没有问题呀！！

在 05-8-24，Bruce Wang<number5 at gmail.com> 写道：
> On 8/24/05, D Shi Ming <dushmo at gmail.com> wrote:
> > 我使用的是Python 2.4.1
> >
> > 2005/8/24, Spirit Auding <auding at gmail.com>:
> > > 阁下的Python什么版本？我的2.4，编译通不过，global不能这么用
> > >
> > >
> > > On 8/24/05, D Shi Ming <dushmo at gmail.com > wrote:
> > > > 使用global语句，告诉Python这个变量名不是局部的，而是全局的。
> > > > def func(x):
> > > >         global x
> > > >         print 'x is', x
> > > >         x = 2
> > > >         print  'Changed local x to', x
> > > >
> > > > x=50
> > > > func()
> > > > print 'x is still', x
> > > >
> > > > x is 50
> > > > Changed local x to 2
> > > > x is still 2
> > > >
> > > >
> 
> 
> 不对啊,  根据定义, x在声明为函数参数之后是不能用在global语句里的，2.4.1的版本也没有改变
> 
> Names listed in a global statement must not be defined as formal
> parameters or in a for loop control target, class definition, function
> definition, or import statement.
> ---- http://www.python.org/doc/2.4.1/ref/global.html#l2h-557
> 
> --
> simple is good
> 
> _______________________________________________
> python-chinese list
> python-chinese at lists.python.cn
> http://python.cn/mailman/listinfo/python-chinese
> 
> 
>

>>> def func(x):
	global x
	
SyntaxError: name 'x' is a function parameter and declared global
(, line 1)
>>> 
不行啊


在 05-8-24，D Shi Ming<dushmo at gmail.com> 写道：
> 程序运行没有问题呀！！
> 
> 在 05-8-24，Bruce Wang<number5 at gmail.com> 写道：
> > On 8/24/05, D Shi Ming <dushmo at gmail.com> wrote:
> > > 我使用的是Python 2.4.1
> > >
> > > 2005/8/24, Spirit Auding <auding at gmail.com>:
> > > > 阁下的Python什么版本？我的2.4，编译通不过，global不能这么用
> > > >
> > > >
> > > > On 8/24/05, D Shi Ming <dushmo at gmail.com > wrote:
> > > > > 使用global语句，告诉Python这个变量名不是局部的，而是全局的。
> > > > > def func(x):
> > > > >         global x
> > > > >         print 'x is', x
> > > > >         x = 2
> > > > >         print  'Changed local x to', x
> > > > >
> > > > > x=50
> > > > > func()
> > > > > print 'x is still', x
> > > > >
> > > > > x is 50
> > > > > Changed local x to 2
> > > > > x is still 2
> > > > >
> > > > >
> >
> >
> > 不对啊,  根据定义, x在声明为函数参数之后是不能用在global语句里的，2.4.1的版本也没有改变
> >
> > Names listed in a global statement must not be defined as formal
> > parameters or in a for loop control target, class definition, function
> > definition, or import statement.
> > ---- http://www.python.org/doc/2.4.1/ref/global.html#l2h-557
> >
> > --
> > simple is good
> >
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> 
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