6:35 p.m.
On 03/06/2014 11:46 PM, Crístian Viana wrote:
Am 06-03-2014 12:12, schrieb Sheldon:
> AFAK, seems two types has no string representation, one is unicode
> and another is object derived from nothing.
The statement if not isinstance(value, unicode), which is in the
sample code above, makes sure that we will not try to convert a
unicode object to string (only those who have a different type).
And an object derived from nothing also has a string representation.
Take a look at this example:
You forgot one. The a follow string format will also do string
representation.
In [2]: class a(): pass
In [9]: def toU1(value):
...: if not isinstance(value, unicode):
...: value = unicode(str(value), 'utf-8')
...: return u"fo(o( = %s" % value
...:
In [10]: def toU2(value):
....: if isinstance(value, str):
....: value = unicode(str(value), 'utf-8')
....: return u"fo(o( = %s" % value
....:
In [11]: print toU1(a)
fo(o( = __main__.a
In [12]: print toU2(a)
fo(o( = __main__.a
In [13]: print toU1("fo(o(")
fo(o( = fo(o(
In [14]: print toU2("fo(o(")
fo(o( = fo(o(
In [15]: print toU1(u"fo(o(")
fo(o( = fo(o(
In [16]: print toU2(u"fo(o(")
fo(o( = fo(o(
if one developer define a class like this, it should tell the ptyhon
this a unicode file.
In [17]: class afo(o((): pass
We have discuss this problem before, kimchi do not like this.
In this case, ptyhon take a string are unicode, it should OK.
Not try.
>> class X():
... def x(self):
... pass
...
>> a = X()
>> print str(a)
<__main__.X instance at 0x7f8fe13d4b00>
>> print "this is a string: %s." % a
this is a
string: <__main__.X instance at 0x7f8fe13d4b00>.
> But I'm not worry about it.
> IMO, no one will not pass this instance of object to KimchiException
> as args.
IMO, we should never trust that the users/developers will pass the
correct parameters to our code. Eventually, someone will forget that,
and then we will have one more bug ;)
your example make me do not need to worry
about this.
>> class X():
... def x(self):
... pass
...
>> a = X()
>> print str(a)
<__main__.X instance at 0x7f8fe13d4b00>
>> print "this is a string: %s." % a
this is a
string: <__main__.X instance at 0x7f8fe13d4b00>.
In [20]: print a
<__main__.X instance at 0x206c440>
In [21]: print u"%s" % a
<__main__.X instance at 0x206c440>
--
Thanks and best regards!
Sheldon Feng(???)<shaohef(a)linux.vnet.ibm.com>
IBM Linux Technology Center