python for web programming

[JStoneGT]

hello,
 
Can you show me some reference datas for python web  programming?Thanks.
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Re: python for web programming

[JStoneGT]

Thanks a lot.
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Socket and array

[JStoneGT]

Hello,
 
How to send an array via socket to the other  end?Thanks.
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sort sort sort

[JStoneGT]

I do need sorting a dict via its values.
Please help give some reference or code samples.
Thanks.
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Newbie question about Class

[JStoneGT]

I'm reading the book of "Dive into Python" and got these code pieces:
 
class  UserDict: 
def __init__(self,  dict=None):  self.data = {} 
if dict is not None: self.update(dict)
 
My question is,for the statement of:
 
if dict is not None: self.update(dict)
 
Why it's not this one below?
 
if dict is not None: self.data.update(dict)
 
Thanks.
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Re: Newbie question about Class

[JStoneGT]

 


[quote]The idea behind that class is to act "as-if" it were a real  
dictionary.  
Dicts have an update method, and UserDict should too. But  it's not listed  
in the book (should appear a few lines below that  code); this is a  
possible implementation:

def update(self,  other):
for key in other.keys():
self.data[key] = other[key]

Given this method, __init__  works fine.
Using self.data.update(dict) is OK if the dict argument is a  real  
dictionary, but not if it's another UserDict.[/quote]
 
 
Thank you.
But I'm still confused that what's the "real dictionary"?I can't know  this 
point.Please help and thanks  again.


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Re: Newbie question about Class

[JStoneGT]

 
Thanks a lot.I've got it.

En Tue,  13 Feb 2007 13:01:59 -0300, <[EMAIL PROTECTED]> escribió:

> But  I'm still confused that what's the "real dictionary"?I can't know
> this
> point.Please help and thanks  again.

I'm  talking about a Python dictionary (a "real" one, as opposed to   
UserDict, which is a "fake" dictionary; it looks and acts like a   
dictionary but it's not).

py> from UserDict import  UserDict
py> d = {"a": 1, "b": 2, "c": 3} # This is a "real"  dictionary
# I create an UserDict instance, its initial contents come from  a  
dictionary
py> ud1 = UserDict(d)
py>  ud1
{'b': 2, 'a': 1, 'c': 3}
# Now I create a second UserDict instance,  its initial contents come from  
the UserDict instance
py> ud2 =  UserDict(ud1)
py> ud2
{'b': 2, 'a': 1, 'c': 3}

-- 
Gabriel  Genellina

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Please help about an instance var

[JStoneGT]

>>> from UserDict import UserDict
>>> d =  {1:2,3:4,5:6}
>>> d1 = UserDict(d)
>>> d1
{1: 2, 3:  4, 5: 6}
>>> d1.data
{1: 2, 3: 4, 5: 6}
 
Here why both d1 and d1.data have the same values?As shown below,they're  
different types.
 
>>> type(d1)

>>>  type(d1.data) 

 
 
Please help.Thanks!
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I'm faint why this can't work

[JStoneGT]

Hello,
 
I got this similar sample script from books:
 
$ cat sampdict.py
#!/usr/bin/python
class  SampDict(dict):
def __init__(self,  filename=None):
self["name"] =  filename 
 
But when I run it I got the errors:
 
>>> from sampdict import SampDict
>>>  SampDict("/etc/passwd")  
Traceback (most recent  call last):
File "", line 1, in ?
File  "sampdict.py", line 4, in __init__
self["name"] = filename  
AttributeError: SampDict instance has no attribute '__setitem__'
 
 
I'm using Python 2.3.4.
 
Please help.Thanks.
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Re: I'm faint why this can't work

[JStoneGT]

 
> Hello,
> I got this similar  sample script from books:
> $ cat sampdict.py
>  #!/usr/bin/python
> class  SampDict(dict):
> def __init__(self,  filename=None):
> self["name"] =  filename


> Are you sure you copied it exactly as it  appears? Where did you find it?
 

Thank you for the help,Gabriel.
The codes got by me from the book of "Dive into  Python".The original codes 
are  below:
 
class  FileInfo(dict):  
"store file  metadata"
def __init__(self, filename=None): 
self["name"] = filename

It's in the chapter 5.5.

 


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